EPPlus This is the store for all Rows, Columns and Cells. It is a Dictionary implementation that allows you to change the Key (the RowID, ColumnID or CellID ) Set Value for Range Add a new page to the collection The column Position The new page object to add Add a new page to the collection The column Position Settings to stay compatible with older versions of EPPlus If the worksheets collection of the ExcelWorkbook class is 1 based. This property can be set from app.config file. IExcelConditionalFormattingAverageGroup IExcelConditionalFormattingBeginsWith IExcelConditionalFormattingBetween IExcelConditionalFormattingColorScaleGroup IExcelConditionalFormattingContainsBlanks IExcelConditionalFormattingContainsErrors IExcelConditionalFormattingContainsText IExcelConditionalFormattingDataBar ShowValue Databar Low Value Databar High Value The color of the databar IExcelConditionalFormattingDuplicateValues IExcelConditionalFormattingEndsWith IExcelConditionalFormattingEqual IExcelConditionalFormattingExpression IExcelConditionalFormattingGreaterThan IExcelConditionalFormattingGreaterThanOrEqual IExcelConditionalFormattingThreeIconSet Icon1 (part of the 3, 4 ou 5 Icon Set) Icon2 (part of the 3, 4 ou 5 Icon Set) Icon3 (part of the 3, 4 ou 5 Icon Set) IExcelConditionalFormattingFourIconSet Icon4 (part of the 4 ou 5 Icon Set) IExcelConditionalFormattingFiveIconSet eExcelconditionalFormatting4IconsSetType Icon5 (part of the 5 Icon Set) IExcelConditionalFormattingIconSetGroup Reverse ShowValue IconSet (3, 4 ou 5 IconSet) IExcelConditionalFormattingThreeColorScale Three Color Scale Middle Value IExcelConditionalFormattingLessThan IExcelConditionalFormattingGreaterThanOrEqual IExcelConditionalFormattingNotBetween IExcelConditionalFormattingNotContainsBlanks IExcelConditionalFormattingNotContainsErrors IExcelConditionalFormattingNotContainsText IExcelConditionalFormattingNotEqual IExcelConditionalFormattingStdDevGroup IExcelConditionalFormattingTimePeriod IExcelConditionalFormattingTopBottomGroup IExcelConditionalFormattingTwoColorScale Two Color Scale Low Value Two Color Scale High Value IExcelConditionalFormattingUniqueValues IExcelConditionalFormattingWithFormula Formula Attribute IExcelConditionalFormattingWithFormula2 Formula2 Attribute IExcelConditionalFormattingWithRank Rank Attribute IExcelConditionalFormattingWithReverse Reverse Attribute IExcelConditionalFormattingWithShowValue ShowValue Attribute IExcelConditionalFormattingWithStdDev StdDev Attribute IExcelConditionalFormattingWithText Text Attribute Interface for conditional formatting rule The 'cfRule' XML node Type of conditional formatting rule. ST_CfType §18.18.12. Range over which these conditional formatting rules apply. The possible values for this attribute are defined by the ST_Sqref simple type (§18.18.76). The priority of this conditional formatting rule. This value is used to determine which format should be evaluated and rendered. Lower numeric values are higher priority than higher numeric values, where 1 is the highest priority. If this flag is 1, no rules with lower priority shall be applied over this rule, when this rule evaluates to true. Gives access to the differencial styling (DXF) for the rule. 18.3.1.11 cfvo (Conditional Format Value Object) Describes the values of the interpolation points in a gradient scale. Initialize the cfvo (§18.3.1.11) node The cfvo (§18.3.1.11) node parent. Can be any of the following: colorScale (§18.3.1.16); dataBar (§18.3.1.28); iconSet (§18.3.1.49) Initialize the cfvo (§18.3.1.11) node The cfvo (§18.3.1.11) node parent. Can be any of the following: colorScale (§18.3.1.16); dataBar (§18.3.1.28); iconSet (§18.3.1.49) Initialize the Initialize the Get/Set the 'cfvo' node @val attribute Get/Set the Formula of the Object Value (uses the same attribute as the Value) Databar ExcelConditionalFormattingThreeIconSet ExcelConditionalFormattingThreeIconSet ExcelConditionalFormattingAboveStdDev ExcelConditionalFormattingAboveOrEqualAverage ExcelConditionalFormattingAverageGroup ExcelConditionalFormattingAboveAverage Collection of . This class is providing the API for EPPlus conditional formatting. The public methods of this class (Add[...]ConditionalFormatting) will create a ConditionalFormatting/CfRule entry in the worksheet. When this Conditional Formatting has been created changes to the properties will affect the workbook immediately. Each type of Conditional Formatting Rule has diferente set of properties. // Add a Three Color Scale conditional formatting var cf = worksheet.ConditionalFormatting.AddThreeColorScale(new ExcelAddress("A1:C10")); // Set the conditional formatting properties cf.LowValue.Type = ExcelConditionalFormattingValueObjectType.Min; cf.LowValue.Color = Color.White; cf.MiddleValue.Type = ExcelConditionalFormattingValueObjectType.Percent; cf.MiddleValue.Value = 50; cf.MiddleValue.Color = Color.Blue; cf.HighValue.Type = ExcelConditionalFormattingValueObjectType.Max; cf.HighValue.Color = Color.Black; Initialize the GetRootNode Validates address - not empty (collisions are allowded) Get the next priority sequencial number Number of validations Index operator, returns by 0-based index Get the 'cfRule' enumerator Get the 'cfRule' enumerator Removes all 'cfRule' from the collection and from the XML. This is the same as removing all the 'conditionalFormatting' nodes. Remove a Conditional Formatting Rule by its object Remove a Conditional Formatting Rule by its 0-based index Remove a Conditional Formatting Rule by its priority Get a rule by its priority Add rule (internal) F Add AboveAverage Rule Add AboveOrEqualAverage Rule Add BelowAverage Rule Add BelowOrEqualAverage Rule Add AboveStdDev Rule Add BelowStdDev Rule Add Bottom Rule Add BottomPercent Rule Add Top Rule Add TopPercent Rule Add Last7Days Rule Add LastMonth Rule Add LastWeek Rule Add NextMonth Rule Add NextWeek Rule Add ThisMonth Rule Add ThisWeek Rule Add Today Rule Add Tomorrow Rule Add Yesterday Rule Add BeginsWith Rule Add Between Rule Add ContainsBlanks Rule Add ContainsErrors Rule Add ContainsText Rule Add DuplicateValues Rule Add EndsWith Rule Add Equal Rule Add Expression Rule Add GreaterThan Rule Add GreaterThanOrEqual Rule Add LessThan Rule Add LessThanOrEqual Rule Add NotBetween Rule Add NotContainsBlanks Rule Add NotContainsErrors Rule Add NotContainsText Rule Add NotEqual Rule Add Unique Rule Add ThreeColorScale Rule Add TwoColorScale Rule Add ThreeIconSet Rule The address Type of iconset Adds a FourIconSet rule Adds a FiveIconSet rule Adds a databar rule Functions related to the param name="attribute" Factory class for ExcelConditionalFormatting. The conditional formatting constants Functions related to the 18.3.1.11 cfvo (Conditional Format Value Object) Describes the values of the interpolation points in a gradient scale. Initialize the cfvo (§18.3.1.11) node The cfvo (§18.3.1.11) node parent. Can be any of the following: colorScale (§18.3.1.16); dataBar (§18.3.1.28); iconSet (§18.3.1.49) Initialize the Initialize the Get the node order (1, 2 ou 3) according to the Position (Low, Middle and High) and the Rule Type (TwoColorScale ou ThreeColorScale). Create the 'cfvo'/'color' nodes in the right order. They should appear like this: "cfvo" --> Low Value (value object) "cfvo" --> Middle Value (value object) "cfvo" --> High Value (value object) "color" --> Low Value (color) "color" --> Middle Value (color) "color" --> High Value (color) Get/Set the 'cfvo' node @val attribute Get/Set the Formula of the Object Value (uses the same attribute as the Value) Enum for Conditional Format Type ST_CfType §18.18.12. With some changes. This conditional formatting rule highlights cells that are above the average for all values in the range. AboveAverage Excel CF Rule Type This conditional formatting rule highlights cells that are above or equal the average for all values in the range. AboveAverage Excel CF Rule Type This conditional formatting rule highlights cells that are below the average for all values in the range. AboveAverage Excel CF Rule Type This conditional formatting rule highlights cells that are below or equal the average for all values in the range. AboveAverage Excel CF Rule Type This conditional formatting rule highlights cells that are above the standard deviationa for all values in the range. AboveAverage Excel CF Rule Type This conditional formatting rule highlights cells that are below the standard deviationa for all values in the range. AboveAverage Excel CF Rule Type This conditional formatting rule highlights cells whose values fall in the bottom N bracket as specified. Top10 Excel CF Rule Type This conditional formatting rule highlights cells whose values fall in the bottom N percent as specified. Top10 Excel CF Rule Type This conditional formatting rule highlights cells whose values fall in the top N bracket as specified. Top10 Excel CF Rule Type This conditional formatting rule highlights cells whose values fall in the top N percent as specified. Top10 Excel CF Rule Type This conditional formatting rule highlights cells containing dates in the last 7 days. TimePeriod Excel CF Rule Type This conditional formatting rule highlights cells containing dates in the last month. TimePeriod Excel CF Rule Type This conditional formatting rule highlights cells containing dates in the last week. TimePeriod Excel CF Rule Type This conditional formatting rule highlights cells containing dates in the next month. TimePeriod Excel CF Rule Type This conditional formatting rule highlights cells containing dates in the next week. TimePeriod Excel CF Rule Type This conditional formatting rule highlights cells containing dates in this month. TimePeriod Excel CF Rule Type This conditional formatting rule highlights cells containing dates in this week. TimePeriod Excel CF Rule Type This conditional formatting rule highlights cells containing today dates. TimePeriod Excel CF Rule Type This conditional formatting rule highlights cells containing tomorrow dates. TimePeriod Excel CF Rule Type This conditional formatting rule highlights cells containing yesterday dates. TimePeriod Excel CF Rule Type This conditional formatting rule highlights cells in the range that begin with the given text. Equivalent to using the LEFT() sheet function and comparing values. BeginsWith Excel CF Rule Type This conditional formatting rule highlights cells in the range between the given two formulas. CellIs Excel CF Rule Type This conditional formatting rule highlights cells that are completely blank. Equivalent of using LEN(TRIM()). This means that if the cell contains only characters that TRIM() would remove, then it is considered blank. An empty cell is also considered blank. ContainsBlanks Excel CF Rule Type This conditional formatting rule highlights cells with formula errors. Equivalent to using ISERROR() sheet function to determine if there is a formula error. ContainsErrors Excel CF Rule Type This conditional formatting rule highlights cells in the range that begin with the given text. Equivalent to using the LEFT() sheet function and comparing values. ContainsText Excel CF Rule Type This conditional formatting rule highlights duplicated values. DuplicateValues Excel CF Rule Type This conditional formatting rule highlights cells ending with given text. Equivalent to using the RIGHT() sheet function and comparing values. EndsWith Excel CF Rule Type This conditional formatting rule highlights cells equals to with given formula. CellIs Excel CF Rule Type This conditional formatting rule contains a formula to evaluate. When the formula result is true, the cell is highlighted. Expression Excel CF Rule Type This conditional formatting rule highlights cells greater than the given formula. CellIs Excel CF Rule Type This conditional formatting rule highlights cells greater than or equal the given formula. CellIs Excel CF Rule Type This conditional formatting rule highlights cells less than the given formula. CellIs Excel CF Rule Type This conditional formatting rule highlights cells less than or equal the given formula. CellIs Excel CF Rule Type This conditional formatting rule highlights cells outside the range in given two formulas. CellIs Excel CF Rule Type This conditional formatting rule highlights cells that does not contains the given formula. CellIs Excel CF Rule Type This conditional formatting rule highlights cells that are not blank. Equivalent of using LEN(TRIM()). This means that if the cell contains only characters that TRIM() would remove, then it is considered blank. An empty cell is also considered blank. NotContainsBlanks Excel CF Rule Type This conditional formatting rule highlights cells without formula errors. Equivalent to using ISERROR() sheet function to determine if there is a formula error. NotContainsErrors Excel CF Rule Type This conditional formatting rule highlights cells that do not contain the given text. Equivalent to using the SEARCH() sheet function. NotContainsText Excel CF Rule Type This conditional formatting rule highlights cells not equals to with given formula. CellIs Excel CF Rule Type This conditional formatting rule highlights unique values in the range. UniqueValues Excel CF Rule Type Three Color Scale (Low, Middle and High Color Scale) ColorScale Excel CF Rule Type Two Color Scale (Low and High Color Scale) ColorScale Excel CF Rule Type This conditional formatting rule applies a 3 set icons to cells according to their values. IconSet Excel CF Rule Type This conditional formatting rule applies a 4 set icons to cells according to their values. IconSet Excel CF Rule Type This conditional formatting rule applies a 5 set icons to cells according to their values. IconSet Excel CF Rule Type This conditional formatting rule displays a gradated data bar in the range of cells. DataBar Excel CF Rule Type Enum for Conditional Format Value Object Type ST_CfvoType §18.18.13 Formula Maximum Value Minimum Value Number Value Percent Percentile Enum for Conditional Formatting Value Object Position The lower position for both TwoColorScale and ThreeColorScale The middle position only for ThreeColorScale The highest position for both TwoColorScale and ThreeColorScale Enum for Conditional Formatting Value Object Node Type 'cfvo' node 'color' node Enum for Conditional Formatting Operartor Type ST_ConditionalFormattingOperator §18.18.15 Begins With. 'Begins with' operator Between. 'Between' operator Contains. 'Contains' operator Ends With. 'Ends with' operator Equal. 'Equal to' operator Greater Than. 'Greater than' operator Greater Than Or Equal. 'Greater than or equal to' operator Less Than. 'Less than' operator Less Than Or Equal. 'Less than or equal to' operator Not Between. 'Not between' operator Does Not Contain. 'Does not contain' operator Not Equal. 'Not equal to' operator Enum for Conditional Formatting Time Period Type ST_TimePeriod §18.18.82 Last 7 Days. A date in the last seven days. Last Month. A date occuring in the last calendar month. Last Week. A date occuring last week. Next Month. A date occuring in the next calendar month. Next Week. A date occuring next week. This Month. A date occuring in this calendar month. This Week. A date occuring this week. Today. Today's date. Tomorrow. Tomorrow's date. Yesterday. Yesterday's date. 18.18.42 ST_IconSetType (Icon Set Type) - Only 3 icons (3 Arrows) 3 arrows icon set. (3 Arrows (Gray)) 3 gray arrows icon set. (3 Flags) 3 flags icon set. (3 Signs) 3 signs icon set. (3 Symbols Circled) 3 symbols icon set. (3 Symbols) 3 Symbols icon set. (3 Traffic Lights) 3 traffic lights icon set (#1). (3 Traffic Lights Black) 3 traffic lights icon set with thick black border. 18.18.42 ST_IconSetType (Icon Set Type) - Only 4 icons (4 Arrows) 4 arrows icon set. (4 Arrows (Gray)) 4 gray arrows icon set. (4 Ratings) 4 ratings icon set. (4 Red To Black) 4 'red to black' icon set. (4 Traffic Lights) 4 traffic lights icon set. 18.18.42 ST_IconSetType (Icon Set Type) - Only 5 icons (5 Arrows) 5 arrows icon set. (5 Arrows (Gray)) 5 gray arrows icon set. (5 Quarters) 5 quarters icon set. (5 Ratings Icon Set) 5 rating icon set. 18.18.42 ST_IconSetType (Icon Set Type) (3 Arrows) 3 arrows icon set. (3 Arrows (Gray)) 3 gray arrows icon set. (3 Flags) 3 flags icon set. (3 Signs) 3 signs icon set. (3 Symbols Circled) 3 symbols icon set. (3 Symbols) 3 Symbols icon set. (3 Traffic Lights) 3 traffic lights icon set (#1). (3 Traffic Lights Black) 3 traffic lights icon set with thick black border. (4 Arrows) 4 arrows icon set. (4 Arrows (Gray)) 4 gray arrows icon set. (4 Ratings) 4 ratings icon set. (4 Red To Black) 4 'red to black' icon set. (4 Traffic Lights) 4 traffic lights icon set. (5 Arrows) 5 arrows icon set. (5 Arrows (Gray)) 5 gray arrows icon set. (5 Quarters) 5 quarters icon set. (5 Ratings Icon Set) 5 rating icon set. Functions related to the Get the sequencial order of a cfvo/color by its position. 1, 2 or 3 Get the CFVO type by its @type attribute Get the cfvo (§18.3.1.11) node parent by the rule type. Can be any of the following: "colorScale" (§18.3.1.16); "dataBar" (§18.3.1.28); "iconSet" (§18.3.1.49) ExcelConditionalFormattingBeginsWith The text to search in the beginning of the cell ExcelConditionalFormattingBelowAverage ExcelConditionalFormattingBelowOrEqualAverage ExcelConditionalFormattingBelowStdDev ExcelConditionalFormattingBetween ExcelConditionalFormattingBottom ExcelConditionalFormattingBottomPercent ExcelConditionalFormattingContainsBlanks ExcelConditionalFormattingContainsErrors ExcelConditionalFormattingContainsText The text to search inside the cell ExcelConditionalFormattingDuplicateValues ExcelConditionalFormattingEndsWith The text to search in the end of the cell ExcelConditionalFormattingEqual ExcelConditionalFormattingExpression ExcelConditionalFormattingGreaterThan ExcelConditionalFormattingGreaterThanOrEqual ExcelConditionalFormattingLast7Days ExcelConditionalFormattingLastMonth ExcelConditionalFormattingLastWeek ExcelConditionalFormattingLessThan ExcelConditionalFormattingLessThanOrEqual ExcelConditionalFormattingNextMonth ExcelConditionalFormattingNextWeek ExcelConditionalFormattingNotBetween ExcelConditionalFormattingNotContainsBlanks ExcelConditionalFormattingNotContainsErrors ExcelConditionalFormattingNotContainsText The text to search inside the cell ExcelConditionalFormattingNotEqual Sinalize that we are in a Cnaging Priorities opeartion so that we won't enter a recursive loop. Initialize the Used also as the cfRule unique key Initialize the Get the <cfRule> node Address of the conditional formatting rule The address is stores in a parent node called <conditionalFormatting> in the @sqref attribute. Excel groups rules that have the same address inside one node. Type of conditional formatting rule. ST_CfType §18.18.12. The priority of this conditional formatting rule. This value is used to determine which format should be evaluated and rendered. Lower numeric values are higher priority than higher numeric values, where 1 is the highest priority. If this flag is true, no rules with lower priority shall be applied over this rule, when this rule evaluates to true. DxfId Style Attribute StdDev (zero is not allowed and will be converted to 1) Rank (zero is not allowed and will be converted to 1) AboveAverage EqualAverage Bottom attribute Percent attribute TimePeriod Operator Formula Formula2 Functions related to the ExcelConditionalFormattingRule Get the "colorScale" rule type according to the number of "cfvo" and "color" nodes. If we have excatly 2 "cfvo" and "color" childs, then we return "twoColorScale" TwoColorScale or ThreeColorScale Get the "aboveAverage" rule type according to the follwoing attributes: "AboveAverage", "EqualAverage" and "StdDev". @StdDev greater than "0" == AboveStdDev @StdDev less than "0" == BelowStdDev @AboveAverage = "1"/null and @EqualAverage = "0"/null == AboveAverage @AboveAverage = "1"/null and @EqualAverage = "1" == AboveOrEqualAverage @AboveAverage = "0" and @EqualAverage = "0"/null == BelowAverage @AboveAverage = "0" and @EqualAverage = "1" == BelowOrEqualAverage /// AboveAverage, AboveOrEqualAverage, BelowAverage or BelowOrEqualAverage Get the "top10" rule type according to the follwoing attributes: "Bottom" and "Percent" @Bottom = "1" and @Percent = "0"/null == Bottom @Bottom = "1" and @Percent = "1" == BottomPercent @Bottom = "0"/null and @Percent = "0"/null == Top @Bottom = "0"/null and @Percent = "1" == TopPercent /// Top, TopPercent, Bottom or BottomPercent Get the "timePeriod" rule type according to "TimePeriod" attribute. /// Last7Days, LastMonth etc. Return cfvo §18.3.1.11 parent according to the rule type ExcelConditionalFormattingThisMonth ExcelConditionalFormattingThisWeek ExcelConditionalFormattingThreeColorScale Private Low Value Private Middle Value Private High Value Low Value for Three Color Scale Object Value Middle Value for Three Color Scale Object Value High Value for Three Color Scale Object Value ExcelConditionalFormattingThreeIconSet Settings for icon 1 in the iconset Settings for icon 2 in the iconset Settings for icon 2 in the iconset Reverse the order of the icons If the cell values are visible Type of iconset ExcelConditionalFormattingTimePeriodGroup ExcelConditionalFormattingToday ExcelConditionalFormattingTomorrow ExcelConditionalFormattingTop ExcelConditionalFormattingTopPercent ExcelConditionalFormattingTwoColorScale Private Low Value Private High Value Low Value for Two Color Scale Object Value High Value for Two Color Scale Object Value Conditional formatting helper Check and fix an address (string address) Convert a color code to Color Object Color Code (Ex. "#FFB43C53" or "FFB43C53") Encode to XML (special characteres: ' " > < &) Decode from XML (special characteres: ' " > < &) Provides functionality for adding Conditional Formatting to a range (). Each method will return a configurable condtional formatting type. Adds a Above Average rule to the range Adds a Above Or Equal Average rule to the range Adds a Below Average rule to the range Adds a Below Or Equal Average rule to the range Adds a Above StdDev rule to the range Adds a Below StdDev rule to the range Adds a Bottom rule to the range Adds a Bottom Percent rule to the range Adds a Top rule to the range Adds a Top Percent rule to the range Adds a Last 7 Days rule to the range Adds a Last Month rule to the range Adds a Last Week rule to the range Adds a Next Month rule to the range Adds a Next Week rule to the range Adds a This Month rule to the range Adds a This Week rule to the range Adds a Today rule to the range Adds a Tomorrow rule to the range Adds a Yesterday rule to the range Adds a Begins With rule to the range Adds a Between rule to the range Adds a ContainsBlanks rule to the range Adds a ContainsErrors rule to the range Adds a ContainsText rule to the range Adds a DuplicateValues rule to the range Adds a EndsWith rule to the range Adds a Equal rule to the range Adds a Expression rule to the range Adds a GreaterThan rule to the range Adds a GreaterThanOrEqual rule to the range Adds a LessThan rule to the range Adds a LessThanOrEqual rule to the range Adds a NotBetween rule to the range Adds a NotContainsBlanks rule to the range Adds a NotContainsErrors rule to the range Adds a NotContainsText rule to the range Adds a NotEqual rule to the range Adds a UniqueValues rule to the range Adds a to the range Adds a to the range Adds a to the range Adds a to the range Adds a to the range Adds a to the range Add AboveOrEqualAverage Conditional Formatting Add AboveOrEqualAverage Conditional Formatting Add BelowOrEqualAverage Conditional Formatting Add BelowOrEqualAverage Conditional Formatting Add AboveStdDev Conditional Formatting Add BelowStdDev Conditional Formatting Add Bottom Conditional Formatting Add BottomPercent Conditional Formatting Add Top Conditional Formatting Add TopPercent Conditional Formatting Add Last7Days Conditional Formatting Add LastMonth Conditional Formatting Add LastWeek Conditional Formatting Add NextMonth Conditional Formatting Add NextWeek Conditional Formatting Add ThisMonth Conditional Formatting Add ThisWeek Conditional Formatting Add Today Conditional Formatting Add Tomorrow Conditional Formatting Add Yesterday Conditional Formatting Add BeginsWith Conditional Formatting Add Between Conditional Formatting Add ContainsBlanks Conditional Formatting Add ContainsErrors Conditional Formatting Add ContainsText Conditional Formatting Add DuplicateValues Conditional Formatting Add EndsWith Conditional Formatting Add Equal Conditional Formatting Add Expression Conditional Formatting Add GreaterThan Conditional Formatting Add GreaterThanOrEqual Conditional Formatting Add LessThan Conditional Formatting Add LessThanOrEqual Conditional Formatting Add NotBetween Conditional Formatting Add NotContainsBlanks Conditional Formatting Add NotContainsErrors Conditional Formatting Add NotContainsText Conditional Formatting Add NotEqual Conditional Formatting Add UniqueValues Conditional Formatting Add ThreeColorScale Conditional Formatting Add TwoColorScale Conditional Formatting Adds a ThreeIconSet rule Adds a FourIconSet rule Adds a FiveIconSet rule Adds a Databar rule The color of the databar ExcelConditionalFormattingUniqueValues ExcelConditionalFormattingYesterday Datatable on chart level. The horizontal borders shall be shown in the data table The vertical borders shall be shown in the data table The outline shall be shown on the data table The legend keys shall be shown in the data table Access fill properties Access border properties Access font properties A serie for a scatter chart Default constructor Parent collection Namespacemanager Topnode Is pivotchart Datalabel A serie for a surface chart Default constructor Parent collection Namespacemanager Topnode Is pivotchart A Surface chart Provides access to line chart specific properties The type of radarchart Access to datalabel properties A serie for a scatter chart Default constructor Parent collection Namespacemanager Topnode Is pivotchart Datalabel A serie for a line chart Default constructor Parent collection Namespacemanager Topnode Is pivotchart Datalabels Marker symbol Smoth lines Line color. The color of the line. Gets or sets the size of the marker. value between 2 and 72. The size of the marker. Gets or sets the width of the line in pt. The width of the line. Marker Line color. (not to be confused with LineColor) The color of the Marker line. Chart type Bar or column How the series are grouped Shape for bar charts Smooth or lines markers Specifies that the radar chart shall be filled and have lines but no markers. Specifies that the radar chart shall have lines and markers but no fill. Specifies that the radar chart shall have lines but no markers and no fill. Bar or pie Position of the labels Axis label position Markerstyle The time unit of major and minor datetime axis values The build in style of the chart. Type of Trendline for a chart Specifies the trendline shall be an exponential curve in the form Specifies the trendline shall be a logarithmic curve in the form , where log is the natural Specifies the trendline shall be a logarithmic curve in the form , where log is the natural Specifies the trendline shall be a moving average of period Period Specifies the trendline shall be a polynomial curve of order Order in the form Specifies the trendline shall be a power curve in the form Specifies the possible ways to display blanks Blank values shall be left as a gap Blank values shall be spanned with a line (Line charts) Blank values shall be treated as zero Specifies the area of the bubbles shall be proportional to the bubble size value. Specifies the radius of the bubbles shall be proportional to the bubble size value. Base class for Chart object. Get the name of the chart node The name Add a secondary axis Reference to the worksheet The chart xml document Type of chart Titel of the chart Chart series An array containg all axis of all Charttypes The XAxis The YAxis If true the charttype will use the secondary axis. The chart must contain a least one other charttype that uses the primary axis. The build-in chart styles. Border rounded corners Show data in hidden rows and columns Specifies the possible ways to display blanks Specifies data labels over the maximum of the chart shall be shown Remove all axis that are not used any more Plotarea Legend Border Fill 3D-settings If the chart has only one serie this varies the colors for each point. Package internal URI Enumerates charttypes Add a new charttype to the chart The type of the new chart Returns a chart at the specific position. The position of the chart. 0-base A collection of trendlines. Add a new trendline The trendline A trendline object Type of Trendline Name in the legend Order for polynominal trendlines Period for monthly average trendlines Forcast forward periods Forcast backwards periods Specify the point where the trendline crosses the vertical axis Display the R-squared value for a trendline Display the trendline equation on the chart Provides access to bubble chart specific properties Specifies the scale factor for the bubble chart. Can range from 0 to 300, corresponding to a percentage of the default size, Specifies negative sized bubbles shall be shown on a bubble chart Specifies if the bubblechart is three dimensional Specifies the scale factor for the bubble chart. Can range from 0 to 300, corresponding to a percentage of the default size, Chart surface settings Show the values Access fill properties Access border properties A serie for a scatter chart Default constructor Parent collection Namespacemanager Topnode Is pivotchart Datalabel Marker symbol Provides access to line chart specific properties If the series has markers If the series has smooth lines Access to datalabel properties Position of the legend Chart ledger Position of the Legend If the legend overlays other objects Fill style Border style Font properties Remove the legend Add a legend to the chart A charts plot area Creates a data table in the plotarea The datatable can also be accessed via the DataTable propery Remove the data table if it's created in the plotarea The data table object. Use the CreateDataTable method to create a datatable if it does not exist. Datalabel properties Position of the labels Access fill properties Access border properties Access font properties A serie for a scatter chart Default constructor Parent collection Namespacemanager Topnode Is pivotchart Datalabel Smooth for scattercharts Marker symbol Line color. The color of the line. Gets or sets the size of the marker. value between 2 and 72. The size of the marker. Marker color. The color of the Marker. Gets or sets the width of the line in pt. The width of the line. Marker Line color. (not to be confused with LineColor) The color of the Marker line. write alpha value (if Color.A != 255) Color where to write alpha-values may only written to color-nodes eg: a:prstClr (preset), a:hslClr (hsl), a:schemeClr (schema), a:sysClr (system), a:scrgbClr (rgb percent) or a:srgbClr (rgb hex) .../a:prstClr/a:alpha/@val read AlphaChannel from a:solidFill alpha or 255 if their is no such node creates xPath to alpha attribute for a color eg: a:prstClr/a:alpha/@val xPath to color node The title of a chart The text A reference to the border properties A reference to the fill properties A reference to the font properties Richtext Show without overlaping the chart. Specifies the centering of the text box. The way it works fundamentally is to determine the smallest possible "bounds box" for the text and then to center that "bounds box" accordingly. This is different than paragraph alignment, which aligns the text within the "bounds box" for the text. This flag is compatible with all of the different kinds of anchoring. If this attribute is omitted, then a value of 0 or false is implied. Vertical text Rotation in degrees (0-360) Provides access to ofpie-chart specific properties Type, pie or bar The size of the gap between two adjacent bars/columns A serie for a pie chart Default constructor Parent collection Namespacemanager Topnode Is pivotchart Explosion for Piecharts DataLabels Bar chart Direction, Bar or columns The shape of the bar/columns Access to datalabel properties The size of the gap between two adjacent bars/columns Position of the axis. Position of the Y-Axis Position of the X-Axis Axis orientaion How the axis are crossed Specifies the value axis shall cross the category axis between data markers Specifies the value axis shall cross the category axis at the midpoint of a category. Where the axis cross. (Axis Crosses at Zero) The category axis crosses at the zero point of the valueaxis (if possible), or the minimum value (if theminimum is greater than zero) or the maximum (if the maximum is less than zero). The axis crosses at the maximum value (Axis crosses at the minimum value of the chart. Tickmarks Specifies the tick marks shall cross the axis. Specifies the tick marks shall be inside the plot area. Specifies there shall be no tick marks. Specifies the tick marks shall be outside the plot area. An axis for a chart Type of axis Value axis Category axis Date axis Series axis majorTickMark This element specifies the major tick marks for the axis. minorTickMark This element specifies the minor tick marks for the axis. Type of axis Where the axis is located Where the axis cross How the axis are crossed The value where the axis cross. Null is automatic Numberformat Position of the labels Access to fill properties Access to border properties Access to font properties If the axis is deleted Position of the Lables Chart axis title Minimum value for the axis. Null is automatic Max value for the axis. Null is automatic Major unit for the axis. Null is automatic Major time unit for the axis. Null is automatic Minor unit for the axis. Null is automatic Minor time unit for the axis. Null is automatic The base for a logaritmic scale Null for a normal scale Axis orientation Major Gridlines for the Axis Minor Gridlines for the Axis Removes Major and Minor gridlines from the Axis Removes gridlines from the Axis Indicates if the Major gridlines should be removed Indicates if the Minor gridlines should be removed Datalabel on chart level. This class is inherited by ExcelChartSerieDataLabel Show the values Show category names Show series names Show percent values Show the leader lines Bubble Size. Separator string Access fill properties Access border properties Access font properties A chart serie Default constructor Parent collection Namespacemanager Topnode Is pivotchart Header for the serie. Header address for the serie. Set this to a valid address or the drawing will be invalid. Set an address for the horisontal labels Access to the trendline collection Collection class for chart series Returns the serie at the specified position. The position of the series. Delete the chart at the specific position Zero based A reference to the chart object Add a new serie to the chart. Do not apply to pivotcharts. The Y-Axis range The X-Axis range Add a new serie to the chart.Do not apply to pivotcharts. The Y-Axis range The X-Axis range Provides access to doughnut chart specific properties Angle of the first slize Size of the doubnut hole Provides access to pie chart specific properties Access to datalabel properties Provides access to scatter chart specific properties If the scatter has LineMarkers or SmoothMarkers If the series has markers Text anchoring Vertical text type How the drawing will be resized. Specifies that the current start and end positions shall be maintained with respect to the distances from the absolute start point of the worksheet. Specifies that the current drawing shall move with its row and column (i.e. the object is anchored to the actual from row and column), but that the size shall remain absolute. Specifies that the current drawing shall move and resize to maintain its row and column anchors (i.e. the object is anchored to the actual from and to row and column). Base class for twoanchored drawings. Drawings are Charts, shapes and Pictures. Position of the a drawing. Column Offset EMU units 1cm = 1/360000 1US inch = 1/914400 1pixel = 1/9525 Row Offset EMU units 1cm = 1/360000 1US inch = 1/914400 1pixel = 1/9525 The name of the drawing object How Excel resize drawings when the column width is changed within Excel. The width of drawings are currently NOT resized in EPPLus when the column width changes Lock drawing Print drawing with sheet Top Left position Bottom right position Add new Drawing types here The drawing collection Xml top node The Drawing object Set the top left corner of a drawing. Note that resizing columns / rows after using this function will effect the position of the drawing Top pixel Left pixel Set the top left corner of a drawing. Note that resizing columns / rows after using this function will effect the position of the drawing Start row - 0-based index. Offset in pixels Start Column - 0-based index. Offset in pixels Set size in Percent Note that resizing columns / rows after using this function will effect the size of the drawing Set size in pixels Note that resizing columns / rows after using this function will effect the size of the drawing Width in pixels Height in pixels Will adjust the position and size of the drawing according to chages in font of rows and to the Normal style. This method will be called before save, so use it only if you need the coordinates of the drawing. Properties for drawing line ends HeaderEnd HeaderEnd TailEndSizeWidth TailEndSizeHeight TailEndSizeWidth TailEndSizeHeight An image object The Image Image format If the picture is created from an Image this type is always Jpeg Set the size of the image in percent from the orginal size Note that resizing columns / rows after using this function will effect the size of the picture Percent Fill Border Hyperlink Indexer Index The VML Drawing Picture object returns the next drawing id. returns the next drawing id. Drawing object used for header and footer pictures Position ID The width in points The height in points Margin Left in points Margin top in points The Title of the image The image Determines whether an image will be displayed in black and white Determines whether a picture will be displayed in grayscale mode Defines the intensity of all colors in an image Default value is 1 Defines the amount of contrast for an image Default value is 0; Defines the intensity of black in an image Default value is 0 Horizontal Alingment Vertical Alingment Linestyle Drawing object used for comments Alternative text to be displayed instead of a graphic. Drawing object used for comments Address in the worksheet Vertical alignment for text Horizontal alignment for text If the drawing object is visible. Background color Linestyle for border Line color Width of the border Autofits the drawingobject If the object is locked when the sheet is protected Specifies that the object's text is locked From position. For comments only when Visible=true. To position. For comments only when Visible=true. Row position for a comment Column position for a comment The position of a VML drawing. Used for comments Row. Zero based Row offset in pixels. Zero based Column. Zero based Column offset. Zero based Collection for Drawing objects. A reference to the drawing xml document Creates the NamespaceManager. Provides access to a namespace manager instance to allow XPath searching Returns the drawing at the specified position. The position of the drawing. 0-base Returns the drawing matching the specified name The name of the worksheet Add a new chart to the worksheet. Do not support Bubble-, Radar-, Stock- or Surface charts. Type of chart The pivottable source for a pivotchart The chart Add a new chart to the worksheet. Do not support Bubble-, Radar-, Stock- or Surface charts. Type of chart The chart Add a picure to the worksheet An image. Allways saved in then JPeg format Add a picure to the worksheet An image. Allways saved in then JPeg format Picture Hyperlink Add a picure to the worksheet The image file Add a picure to the worksheet The image file Picture Hyperlink Add a new shape to the worksheet Name Shape style The shape object Add a new shape to the worksheet Name Source shape The shape object Removes a drawing. The index of the drawing Removes a drawing. The drawing Removes a drawing. The name of the drawing Removes all drawings from the collection An Excel shape. Shape style Fill Border Line Ends Text inside the shape Lock drawing Richtext collection. Used to format specific parts of the text Text Anchoring Specifies the centering of the text box. How the text is aligned Indentation Vertical text Type of Line cap Line style. Border for drawings Fill Linestyle Linecap Width in pixels Fill properties for drawing objects Fill style Fill color for solid fills Transparancy in percent 3D settings Degree of perspective Rotation X-axis Rotation Y-axis Right Angle Axes Depth % of base Height % of base Interface for data validation Address of data validation Validation type Controls how Excel will handle invalid values. True if input message should be shown True if input message should be shown True if error message should be shown. Title of error message box (see property ShowErrorMessage) Error message box text (see property ShowErrorMessage) Title of info box if input message should be shown (see property ShowInputMessage) Info message text (see property ShowErrorMessage) True if the current validation type allows operator. Validates the state of the validation. Data validation interface for Any value validation. Data validation interface for custom validation. Validation interface for datetime validations Data validation interface for decimal values Data validation interface for time validation. Interface for a data validation with two formulas Formula 2 Represents a validation with an operator Operator type Any value validation. Constructor Constructor Constructor This method will validate the state of the validation Custom validation, i.e. a formula. Constructor Constructor Constructor Validation for . Constructor Constructor Constructor Factory class for ExcelDataValidation. Creates an instance of out of the given parameters. Validation for times (). Constructor Constructor Constructor A validation containing a formula Constructor Constructor Worksheet that owns the validation Xml top node (dataValidations) Data validation type address for data validation Constructor Worksheet that owns the validation Xml top node (dataValidations) Data validation type address for data validation for test purposes Formula - Either a {T} value (except for custom validation) or a spreadsheet formula Constructor Constructor Worksheet that owns the validation Xml top node (dataValidations) Data validation type address for data validation Constructor Worksheet that owns the validation Xml top node (dataValidations) Data validation type address for data validation for test purposes Formula - Either a {T} value or a spreadsheet formula Represents a time between 00:00:00 and 23:59:59 Max number of decimals when rounding. Default constructor Constructor An existing time for initialization If we are unlucky second might be rounded up to 60. This will have the minute to be raised and might affect the hour. Hour between 0 and 23 Minute between 0 and 59 Second between 0 and 59 Returns the excel decimal representation of a time. Returns the excel decimal representation of a time as a string. Interface for a data validation formula An excel formula Validation formula interface for Interface for a data validation of list type A list of value strings. Interface for a formula with a value The value. Interface for a data validation formula of float value Interface for a data validation formula of value Enumeration representing the state of an Value is set Formula is set Base class for a formula Constructor Namespacemanger of the worksheet validation top node xml path of the current formula State of the validationformula, i.e. tells if value or formula is set A formula which output must match the current validation type This value will be stored in the xml. Can be overridden by subclasses Returns the value as a string. Must be implemented by subclasses This class represents a validation formula. Its value can be specified as a value of the specified datatype or as a formula. Constructor Namespacemanger of the worksheet validation top node xml path of the current formula Typed value Operator for comparison between Formula and Formula2 in a validation. warning style, controls how Excel will handle invalid changes. warning style will be excluded stop warning style, invalid changes will not be accepted warning will be presented when an attempt to an invalid change is done, but the change will be accepted. information warning style. Data validation for decimal values Constructor Constructor Constructor For test purposes This class represents an List data validation. Constructor Constructor Constructor Namespace manager, for test purposes Data validation for integer values. Constructor Constructor Constructor For test purposes Provides functionality for adding datavalidation to a range (). Each method will return a configurable validation. Adds a to the range. A that can be configured for any validation Adds a to the range A that can be configured for integer data validation Adds a to the range A that can be configured for decimal data validation Adds a to the range A that can be configured for datetime data validation Adds a to the range A that can be configured for datetime data validation Adds a regarding text length validation to the range. Adds a to the range. A that can be configured for time data validation Adds a to the range. A that can be configured for custom validation Excel datavalidation Constructor worksheet that owns the validation Xml top node (dataValidations) Data validation type address for data validation Constructor worksheet that owns the validation Xml top node (dataValidations) when importing xml Data validation type address for data validation Xml Namespace manager This method will validate the state of the validation If the state breaks the rules of the validation True if the validation type allows operator to be set. Address of data validation Validation type Operator for comparison between the entered value and Formula/Formulas. Warning style True if blanks should be allowed True if input message should be shown True if error message should be shown Title of error message box Error message box text Formula 1 Formula 2 Collection of . This class is providing the API for EPPlus data validation. The public methods of this class (Add[...]Validation) will create a datavalidation entry in the worksheet. When this validation has been created changes to the properties will affect the workbook immediately. Each type of validation has either a formula or a typed value/values, except for custom validation which has a formula only. // Add a date time validation var validation = worksheet.DataValidation.AddDateTimeValidation("A1"); // set validation properties validation.ShowErrorMessage = true; validation.ErrorTitle = "An invalid date was entered"; validation.Error = "The date must be between 2011-01-31 and 2011-12-31"; validation.Prompt = "Enter date here"; validation.Formula.Value = DateTime.Parse("2011-01-01"); validation.Formula2.Value = DateTime.Parse("2011-12-31"); validation.Operator = ExcelDataValidationOperator.between; Constructor Validates address - not empty, collisions Validates all data validations. Adds a to the worksheet. The range/address to validate Adds an to the worksheet. Whole means that the only accepted values are integer values. the range/address to validate Addes an to the worksheet. The only accepted values are decimal values. The range/address to validate Adds an to the worksheet. The accepted values are defined in a list. The range/address to validate Adds an regarding text length to the worksheet. The range/address to validate Adds an to the worksheet. The range/address to validate Adds a to the worksheet. The range/address to validate Removes an from the collection. The item to remove True if remove succeeds, otherwise false if is null Number of validations Index operator, returns by 0-based index Index operator, returns a data validation which address partly or exactly matches the searched address. A cell address or range A or null if no match Returns all validations that matches the supplied predicate . predicate to filter out matching validations Returns the first matching validation. Removes all validations from the collection. Removes the validations that matches the predicate Enum for available data validation types Any value Integer value Decimal values List of values Text length validation DateTime validation Time validation Custom validation Types of datavalidation Validation type This type allows operator to be set Returns a validation type by Overridden Equals, compares on internal validation type Overrides GetHashCode() Integer values Integer values List of allowed values Handels encrypted Excel documents Read the package from the OLE document and decrypt it using the supplied password The file Read the package from the OLE document and decrypt it using the supplied password The memory stream. The encryption object from the Package Encrypts a package The package as a byte array The encryption info from the workbook Create an EncryptionInfo object to encrypt a workbook The password The Encryption key Decrypt a document The Encrypted data Encryption Info object The password Validate the password The encryption key The encryption info extracted from the ENCRYPTIOINFO stream inside the OLE document Validate the password The hash algorithm The encryption info extracted from the ENCRYPTIOINFO stream inside the OLE document Create the hash. This method is written with the help of Lyquidity library, many thanks for this nice sample The password The encryption info extracted from the ENCRYPTIOINFO stream inside the OLE document The hash to encrypt the document Create the hash. This method is written with the help of Lyquidity library, many thanks for this nice sample The password The encryption info extracted from the ENCRYPTIOINFO stream inside the OLE document The block key appended to the hash to obtain the final hash The hash to encrypt the document Encryption Header inside the EncryptionInfo stream AES. MUST conform to the AES algorithm. RC2. MUST conform to [RFC2268]. RC4. MUST conform to the DES algorithm. MUST conform to the [DRAFT-DESX] algorithm. 3DES. MUST conform to the [RFC1851] algorithm. 3DES_112 MUST conform to the [RFC1851] algorithm. Cipher block chaining (CBC). Cipher feedback chaining (CFB), with 8-bit window. Hashalgorithm Sha 1-MUST conform to [RFC4634] Sha 256-MUST conform to [RFC4634] Sha 384-MUST conform to [RFC4634] Sha 512-MUST conform to [RFC4634] MD5 MD4 MD2 RIPEMD-128 MUST conform to [ISO/IEC 10118] RIPEMD-160 MUST conform to [ISO/IEC 10118] WHIRLPOOL MUST conform to [ISO/IEC 10118] Handels the agile encryption Handles the EncryptionInfo stream Encryption verifier inside the EncryptionInfo stream An image that fills the background of the worksheet. The topnode of the worksheet Worksheet reference The background image of the worksheet. The image will be saved internally as a jpg. Set the picture from an image file. The image file will be saved as a blob, so make sure Excel supports the image format. The image file. Encryption Algorithm 128-bit AES. Default 192-bit AES. 256-bit AES. The major version of the Encryption Standard Encryption. Used in Excel 2007 and previous version with compatibility pack. Default AES 128 with SHA-1 as the hash algorithm. Spincount is hardcoded to 50000 Agile Encryption. Used in Excel 2010- Default. How and if the workbook is encrypted Constructor Default AES 256 with SHA-512 as the hash algorithm. Spincount is set to 100000 Constructor Algorithm used to encrypt the package. Default is AES128 Is the package encrypted The password used to encrypt the workbook. Algorithm used for encrypting the package. Default is AES 128-bit for standard and AES 256 for agile The version of the encryption. Algorithm for password hash Specifies that the MD2 algorithm, as defined by RFC 1319, shall be used. Specifies that the MD4 algorithm, as defined by RFC 1319, shall be used. Specifies that the MD5 algorithm, as defined by RFC 1319, shall be used. Specifies that the RIPEMD-128 algorithm, as defined by RFC 1319, shall be used. Specifies that the RIPEMD-160 algorithm, as defined by ISO/IEC10118-3:2004 shall be used. Specifies that the SHA-1 algorithm, as defined by ISO/IEC 10118-3:2004 shall be used. Specifies that the SHA-256 algorithm, as defined by ISO/IEC10118-3:2004 shall be used. Specifies that the SHA-384 algorithm, as defined by ISO/IEC 10118-3:2004 shall be used. Specifies that the SHA-512 algorithm, as defined by ISO/IEC10118-3:2004 shall be used. Specifies that the WHIRLPOOL algorithm, as defined by ISO/IEC 10118-3:2004 shall be used. Sets the password for the range Flag enum, specify all flags that you want to exclude from the copy. Exclude formulas from being copied Base collection class for styles. The style type Finds the key the key to be found The found object. True if found Find Index Represents one or more columns within the worksheet Creates a new instance of the ExcelColumn class. For internal use only! Sets the first column the definition refers to. Sets the last column the definition refers to. Internal range id for the column Allows the column to be hidden in the worksheet Sets the width of the column in the worksheet If set to true a column automaticlly resize(grow wider) when a user inputs numbers in a cell. If the column is collapsed in outline mode Outline level. Zero if no outline Phonetic The Style applied to the whole column. Only effects cells with no individual style set. Use Range object if you want to set specific styles. Sets the style for the entire column using a style name. Sets the style for the entire column using the style ID. Adds a manual page break after the column. Returns the range of columns covered by the column definition. A string describing the range of columns covered by the column definition. Set the column width from the content of the range. The minimum width is the value of the ExcelWorksheet.defaultColumnWidth property. Note: Cells containing formulas are ignored since EPPlus don't have a calculation engine. Wrapped and merged cells are also ignored. Set the column width from the content. Note: Cells containing formulas are ignored since EPPlus don't have a calculation engine. Wrapped and merged cells are also ignored. Minimum column width Set the column width from the content. Note: Cells containing formulas are ignored since EPPlus don't have a calculation engine. Wrapped and merged cells are also ignored. Minimum column width Maximum column width Get the internal RangeID Sheet no Column Copies the current column to a new worksheet The worksheet where the copy will be created How a picture will be aligned in the header/footer The picture will be added to the left aligned text The picture will be added to the centered text The picture will be added to the right aligned text Print header and footer Get/set the text to appear on the left hand side of the header (or footer) on the worksheet. Get/set the text to appear in the center of the header (or footer) on the worksheet. Get/set the text to appear on the right hand side of the header (or footer) on the worksheet. Inserts a picture at the end of the text in the header or footer The image object containing the Picture Alignment. The image object will be inserted at the end of the Text. Inserts a picture at the end of the text in the header or footer The image object containing the Picture Alignment. The image object will be inserted at the end of the Text. Represents the Header and Footer on an Excel Worksheet The code for "current page #" The code for "total pages" The code for "text font color" RGB Color is specified as RRGGBB Theme Color is specified as TTSNN where TT is the theme color Id, S is either "+" or "-" of the tint/shade value, NN is the tint/shade value. The code for "sheet tab name" The code for "this workbook's file path" The code for "this workbook's file name" The code for "date" The code for "time" The code for "picture as background" The code for "outline style" The code for "shadow style" ExcelHeaderFooter Constructor The worksheet Gets/sets the alignWithMargins attribute Gets/sets the flag that tells Excel to display different headers and footers on odd and even pages. Gets/sets the flag that tells Excel to display different headers and footers on the first page of the worksheet. Specify whether the header and footer should scale as you use the "Shrink to fit" feature on the document Provides access to the header on odd numbered pages of the document. If you want the same header on both odd and even pages, then only set values in this ExcelHeaderFooterText class. Provides access to the footer on odd numbered pages of the document. If you want the same footer on both odd and even pages, then only set values in this ExcelHeaderFooterText class. Provides access to the header on even numbered pages of the document. Provides access to the footer on even numbered pages of the document. Provides access to the header on the first page of the document. Provides access to the footer on the first page of the document. Vml drawings. Underlaying object for Header footer images Saves the header and footer information to the worksheet XML Maps to DotNetZips CompressionLevel enum Represents an Excel 2007/2010 XLSX file package. This is the top-level object to access all parts of the document. FileInfo newFile = new FileInfo(outputDir.FullName + @"\sample1.xlsx"); if (newFile.Exists) { newFile.Delete(); // ensures we create a new workbook newFile = new FileInfo(outputDir.FullName + @"\sample1.xlsx"); } using (ExcelPackage package = new ExcelPackage(newFile)) { // add a new worksheet to the empty workbook ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Inventory"); //Add the headers worksheet.Cells[1, 1].Value = "ID"; worksheet.Cells[1, 2].Value = "Product"; worksheet.Cells[1, 3].Value = "Quantity"; worksheet.Cells[1, 4].Value = "Price"; worksheet.Cells[1, 5].Value = "Value"; //Add some items... worksheet.Cells["A2"].Value = "12001"; worksheet.Cells["B2"].Value = "Nails"; worksheet.Cells["C2"].Value = 37; worksheet.Cells["D2"].Value = 3.99; worksheet.Cells["A3"].Value = "12002"; worksheet.Cells["B3"].Value = "Hammer"; worksheet.Cells["C3"].Value = 5; worksheet.Cells["D3"].Value = 12.10; worksheet.Cells["A4"].Value = "12003"; worksheet.Cells["B4"].Value = "Saw"; worksheet.Cells["C4"].Value = 12; worksheet.Cells["D4"].Value = 15.37; //Add a formula for the value-column worksheet.Cells["E2:E4"].Formula = "C2*D2"; //Ok now format the values; using (var range = worksheet.Cells[1, 1, 1, 5]) { range.Style.Font.Bold = true; range.Style.Fill.PatternType = ExcelFillStyle.Solid; range.Style.Fill.BackgroundColor.SetColor(Color.DarkBlue); range.Style.Font.Color.SetColor(Color.White); } worksheet.Cells["A5:E5"].Style.Border.Top.Style = ExcelBorderStyle.Thin; worksheet.Cells["A5:E5"].Style.Font.Bold = true; worksheet.Cells[5, 3, 5, 5].Formula = string.Format("SUBTOTAL(9,{0})", new ExcelAddress(2,3,4,3).Address); worksheet.Cells["C2:C5"].Style.Numberformat.Format = "#,##0"; worksheet.Cells["D2:E5"].Style.Numberformat.Format = "#,##0.00"; //Create an autofilter for the range worksheet.Cells["A1:E4"].AutoFilter = true; worksheet.Cells["A1:E5"].AutoFitColumns(0); // lets set the header text worksheet.HeaderFooter.oddHeader.CenteredText = "&24&U&\"Arial,Regular Bold\" Inventory"; // add the page number to the footer plus the total number of pages worksheet.HeaderFooter.oddFooter.RightAlignedText = string.Format("Page {0} of {1}", ExcelHeaderFooter.PageNumber, ExcelHeaderFooter.NumberOfPages); // add the sheet name to the footer worksheet.HeaderFooter.oddFooter.CenteredText = ExcelHeaderFooter.SheetName; // add the file path to the footer worksheet.HeaderFooter.oddFooter.LeftAlignedText = ExcelHeaderFooter.FilePath + ExcelHeaderFooter.FileName; worksheet.PrinterSettings.RepeatRows = worksheet.Cells["1:2"]; worksheet.PrinterSettings.RepeatColumns = worksheet.Cells["A:G"]; // Change the sheet view to show it in page layout mode worksheet.View.PageLayoutView = true; // set some document properties package.Workbook.Properties.Title = "Invertory"; package.Workbook.Properties.Author = "Jan Källman"; package.Workbook.Properties.Comments = "This sample demonstrates how to create an Excel 2007 workbook using EPPlus"; // set some extended property values package.Workbook.Properties.Company = "AdventureWorks Inc."; // set some custom property values package.Workbook.Properties.SetCustomPropertyValue("Checked by", "Jan Källman"); package.Workbook.Properties.SetCustomPropertyValue("AssemblyName", "EPPlus"); // save our new workbook and we are done! package.Save(); } return newFile.FullName; More samples can be found at http://epplus.codeplex.com/ Extention Schema types Main Xml schema name Relationship schema name Maximum number of columns in a worksheet (16384). Maximum number of rows in a worksheet (1048576). Create a new instance of the ExcelPackage. Output is accessed through the Stream property. Create a new instance of the ExcelPackage class based on a existing file or creates a new file. If newFile exists, it is opened. Otherwise it is created from scratch. Create a new instance of the ExcelPackage class based on a existing file or creates a new file. If newFile exists, it is opened. Otherwise it is created from scratch. Password for an encrypted package Create a new instance of the ExcelPackage class based on a existing template. If newFile exists, it will be overwritten when the Save method is called The name of the Excel file to be created The name of the Excel template to use as the basis of the new Excel file Create a new instance of the ExcelPackage class based on a existing template. If newFile exists, it will be overwritten when the Save method is called The name of the Excel file to be created The name of the Excel template to use as the basis of the new Excel file Password to decrypted the template Create a new instance of the ExcelPackage class based on a existing template. The name of the Excel template to use as the basis of the new Excel file if true use a stream. If false create a file in the temp dir with a random name Create a new instance of the ExcelPackage class based on a existing template. The name of the Excel template to use as the basis of the new Excel file if true use a stream. If false create a file in the temp dir with a random name Password to decrypted the template Create a new instance of the ExcelPackage class based on a stream The stream object can be empty or contain a package. The stream must be Read/Write Create a new instance of the ExcelPackage class based on a stream The stream object can be empty or contain a package. The stream must be Read/Write The password to decrypt the document Create a new instance of the ExcelPackage class based on a stream The output stream. Must be an empty read/write stream. This stream is copied to the output stream at load Create a new instance of the ExcelPackage class based on a stream The output stream. Must be an empty read/write stream. This stream is copied to the output stream at load Password to decrypted the template Init values here Create a new file from a template An existing xlsx file to use as a template The password to decrypt the package. Pull request from perkuypers to read open Excel workbooks Path Stream Returns a reference to the package Information how and if the package is encrypted Returns a reference to the workbook component within the package. All worksheets and cells can be accessed through the workbook. Automaticlly adjust drawing size when column width/row height are adjusted, depending on the drawings editBy property. Default True Saves the XmlDocument into the package at the specified Uri. The Uri of the component The XmlDocument to save Saves the XmlDocument into the package at the specified Uri. The Uri of the component The XmlDocument to save Closes the package. Saves all the components back into the package. This method recursively calls the Save method on all sub-components. We close the package after the save is done. Saves all the components back into the package. This method recursively calls the Save method on all sub-components. The package is closed after it has ben saved d to encrypt the workbook with. This parameter overrides the Workbook.Encryption.Password. Saves the workbook to a new file The package is closed after it has been saved The file location Saves the workbook to a new file The package is closed after it has been saved The file The password to encrypt the workbook with. This parameter overrides the Encryption.Password. Copies the Package to the Outstream The package is closed after it has been saved The stream to copy the package to Copies the Package to the Outstream The package is closed after it has been saved The stream to copy the package to The password to encrypt the workbook with. This parameter overrides the Encryption.Password. The output file. Null if no file is used Close the internal stream The output stream. This stream is the not the encrypted package. To get the encrypted package use the SaveAs(stream) method. Compression option for the package Compatibility settings for older versions of EPPlus. Get the XmlDocument from an URI The Uri to the part The XmlDocument Saves and returns the Excel files as a bytearray. Note that the package is closed upon save Example how to return a document from a Webserver... ExcelPackage package=new ExcelPackage(); /**** ... Create the document ****/ Byte[] bin = package.GetAsByteArray(); Response.ContentType = "Application/vnd.ms-Excel"; Response.AddHeader("content-disposition", "attachment; filename=TheFile.xlsx"); Response.BinaryWrite(bin); Saves and returns the Excel files as a bytearray Note that the package is closed upon save Example how to return a document from a Webserver... ExcelPackage package=new ExcelPackage(); /**** ... Create the document ****/ Byte[] bin = package.GetAsByteArray(); Response.ContentType = "Application/vnd.ms-Excel"; Response.AddHeader("content-disposition", "attachment; filename=TheFile.xlsx"); Response.BinaryWrite(bin); The password to encrypt the workbook with. This parameter overrides the Encryption.Password. Loads the specified package data from a stream. The input. Loads the specified package data from a stream. The input. The password to decrypt the document Copies the input stream to the output stream. The input stream. The output stream. A range of cells. Access the range using an address The address A range object Access a single cell The row The column A range object Access a range of cells Start row Start column End Row End Column Represents an individual row in the spreadsheet. Internal RowID. Creates a new instance of the ExcelRow class. For internal use only! The parent worksheet The row number Provides access to the node representing the row. Allows the row to be hidden in the worksheet Sets the height of the row Set to true if You don't want the row to Autosize Sets the style for the entire column using a style name. Sets the style for the entire row using the style ID. Rownumber If outline level is set this tells that the row is collapsed Outline level. Show phonetic Information The Style applied to the whole row. Only effekt cells with no individual style set. Use ExcelRange object if you want to set specific styles. Adds a manual page break after the row. Copies the current row to a new worksheet The worksheet where the copy will be created Containts all shared cell styles for a workbook Loads the style XML to memory Handels changes of properties on the style objects Handles property changes on Named styles. Sets protection on the workbook level Sets a password for the workbook. This does not encrypt the workbook. The password. Locks the structure,which prevents users from adding or deleting worksheets or from displaying hidden worksheets. Locks the position of the workbook window. Lock the workbook for revision Discribes a column when reading a text using the ExcelRangeBase.LoadFromText method Let the the import decide. Always a string. Try to convert it to a number. If it fails then add it as a string. Try to convert it to a date. If it fails then add it as a string. Try to convert it to a number and divide with 100. Removes any tailing percent sign (%). If it fails then add it as a string. Describes how to split a CSV text. Used by the ExcelRange.LoadFromText method Describes how to split a CSV text Default values PropertyValue Delimiter, TextQualifierNone (\0) EOLCRLF CultureCultureInfo.InvariantCulture DataTypesEnd of line default CRLF SkipLinesBeginning0 SkipLinesEnd0 EncodingEncoding.ASCII Delimiter character Text qualifier character End of line characters. Default CRLF Datatypes list for each column (if column is not present Unknown is assumed) Culture used when parsing. Default CultureInfo.InvariantCulture Number of lines skiped in the begining of the file. Default 0. Number of lines skiped at the end of the file. Default 0. Only used when reading files from disk using a FileInfo object. Default AscII This method follows the calculation chain to get the order of the calculation Goto (!) is used internally to prevent stackoverflow on extremly larget dependency trees (that is, many recursive formulas). The dependency chain object The formula tokenizer The workbook where the formula comes from The worksheet where the formula comes from The cell function object Calcultaiton options This class should be implemented to be able to deliver excel data to the formula parser. A range of cells in a worksheet. Information and help methods about a cell Returns the names of all worksheet names Returns all defined names in a workbook Returns values from the required range. The name of the worksheet Row Column The reference address Returns values from the required range. The name of the worksheet The reference address Returns a single cell value Returns the address of the lowest rightmost cell on the worksheet. Use this method to free unmanaged resources. Max number of columns in a worksheet that the Excel data provider can handle. Max number of rows in a worksheet that the Excel data provider can handle Handles translations from Spreadsheet addresses to 0-based numeric index. Translates an address in format "A1" to col- and rowindex. If the supplied address is a range, the address of the first part will be calculated. Translates an address in format "A1" to col- and rowindex. Returns true if this range collides (full or partly) with the supplied range The range to check will be used if no worksheet name is specified in address of a range Simple implementation of DateValue function, just using .NET built-in function System.DateTime.TryParse, based on current culture This implementation was found on http://stackoverflow.com/questions/1285191/get-week-of-date-from-linq-query Simple implementation of TimeValue function, just using .NET built-in function System.DateTime.TryParse, based on current culture Base class for functions that handles an error that occurs during the normal execution of the function. If an exception occurs during the Execute-call that exception will be caught by the compiler, then the HandleError-method will be called. Indicates that the function is an ErrorHandlingFunction. Method that should be implemented to handle the error. Base class for Excel function implementations. Arguments to the function, each argument can contain primitive types, lists or Excel ranges The contains various data that can be useful in functions. A containing the calculated value If overridden, this method is called before Execute is called. Used for some Lookupfunctions to indicate that function arguments should not be compiled before the function is called. This functions validates that the supplied contains at least (the value of) elements. If one of the arguments is an Excel range the number of cells in that range will be counted as well. The of the that will be thrown if is not met. This functions validates that the supplied contains at least (the value of) elements. If one of the arguments is an Excel range the number of cells in that range will be counted as well. Returns the value of the argument att the position of the 0-based as an integer. Value of the argument as an integer. Returns the value of the argument att the position of the 0-based as a string. Value of the argument as a string. Returns the value of the argument att the position of the 0-based Value of the argument as a double. Returns the value of the argument att the position of the 0-based as a . Value of the argument as an integer. If the argument is a boolean value its value will be returned. If the argument is an integer value, true will be returned if its value is not 0, otherwise false. Throws an if evaluates to true. Throws an if evaluates to true. Formats to the message string. Throws an with the given set. Throws an if evaluates to true. Helper method for comparison of two doubles. Will return the arguments as an enumerable of doubles. Will return the arguments as an enumerable of doubles. If a cell is hidden and this value is true the value of that cell will be ignored If a cell contains an error, that error will be ignored if this method is set to true Will return the arguments as an enumerable of doubles. If a cell is hidden and this value is true the value of that cell will be ignored Will return the arguments as an enumerable of objects. If a cell is hidden and this value is true the value of that cell will be ignored Use this method to create a result to return from Excel functions. Use this method to apply a function on a collection of arguments. The should be modifyed in the supplied and will contain the result after this operation has been performed. if the supplied argument contains an Excel error an with that errorcode will be thrown If the supplied contains an Excel error an with that errorcode will be thrown This class provides methods for accessing/modifying VBA Functions. Gets a of custom s. Loads a module of s to the function repository. A that can be used for adding functions and custom function compilers. Removes all functions from the repository Returns true if the the supplied exists in the repository. Returns the names of all implemented functions. Adds or replaces a function. Case-insensitive name of the function that should be added or replaced. An implementation of an . Base class Gets a dictionary of custom function implementations. Gets a dictionary of custom function compilers. A function compiler is not necessary for a custom function, unless the default expression evaluation is not sufficient for the implementation of the custom function. When a FunctionCompiler instance is created, it should be given a reference to the same function instance that exists in the Functions collection of this module. Base class for functions that needs to handle cells that is not visible. Set to true or false to indicate whether the function should ignore hidden values. Gets a dictionary of custom function implementations. Gets a dictionary of custom function compilers. A function compiler is not necessary for a custom function, unless the default expression evaluation is not sufficient for the implementation of the custom function. When a FunctionCompiler instance is created, it should be given a reference to the same function instance that exists in the Functions collection of this module. Thanks to the guys in this thread: http://stackoverflow.com/questions/2840798/c-sharp-math-class-question This Exception represents an Excel error. When this exception is thrown from an Excel function, the ErrorValue code will be set as the value of the parsed cell. The error value Gets or sets a value that indicates whether or not to resolve directly to an Why do the If function require a compiler of its own you might ask;) It is because it only needs to evaluate one of the two last expressions. This compiler handles this - it ignores the irrelevant expression. Expression that handles execution of a function. Constructor should be the of the function True if the numeric result of the function should be negated. Provides access to various functionality regarding excel formula evaluation. Loads a module containing custom functions to the formula parser. By using this method you can add your own implementations of Excel functions, by implementing a . A containing s. If the supplied does not exist, the supplied implementation will be added to the formula parser. If it exists, the existing function will be replaced by the supplied function implementation Copies existing ´s from one workbook to another. The workbook containing the forumulas to be copied. Returns an enumeration of the names of all functions implemented, both the built in functions and functions added using the LoadFunctionModule method of this class. Function names in lower case Returns an enumeration of all implemented functions, including the implementing instance. An enumeration of , where the key is the function name Parses the supplied and returns the result. Attaches a logger to the . An instance of Attaches a logger to the formula parser that produces output to the supplied logfile. Detaches any attached logger from the formula parser. This class provides access to s - classes that exposes functionatlity needed when parsing strings to tokens. Handles a tokenseparator. Returns true if the tokenseparator was handled. Used for logging during FormulaParsing Called each time an exception occurs during formula parsing. Called each time information should be logged during formula parsing. Called to log a message outside the parsing context. Called each time a cell within the calc chain is accessed during formula parsing. Called each time a function is called during formula parsing. Some functions measure performance, if so this function will be called. Create loggers that can be used for logging the formula parser. Creates a logger that logs to a simple textfile. Attaches a logger, errors and log entries will be written to the logger during the parsing process. if a logger is attached it will be removed. Parsing context The of the current context. The is an abstraction on top of Excel, in this case EPPlus. Utility for handling addresses of the current context Configuration Scopes, a scope represents the parsing of a cell or a value. Returns true if a is attached to the parser. Factory method. Represents a parsing of a single input or workbook addrses. Id of the scope. The calling scope. The address of the cell currently beeing parsed. True if the current scope is a Subtotal function beeing executed. This class implements a stack on which instances of are put. Each ParsingScope represents the parsing of an address in the workbook. Creates a new and puts it on top of the stack. The current parsing scope. Removes the current scope, setting the calling scope to current. Represents the errortypes in excel Division by zero Not applicable Name error Null error Num error Reference error Value error Represents an Excel error. Handles the convertion between and the string values used by Excel. Returns true if the supplied is an excel error. Returns true if the supplied is an excel error. Converts a string to an Thrown if the supplied value is not an Excel error The error type Returns the string representation of the error type This class exposes a set of COM-accessible wrappers for static methods available on the ZipFile class. You don't need this class unless you are using DotNetZip from a COM environment. A wrapper for ZipFile.IsZipFile(string) The filename to of the zip file to check. true if the file contains a valid zip file. A wrapper for ZipFile.IsZipFile(string, bool) We cannot use "overloaded" Method names in COM interop. So, here, we use a unique name. The filename to of the zip file to check. true if the file contains a valid zip file. A wrapper for ZipFile.CheckZip(string) The filename to of the zip file to check. true if the named zip file checks OK. Otherwise, false. A COM-friendly wrapper for the static method . The filename to of the zip file to check. The password to check. true if the named zip file checks OK. Otherwise, false. A wrapper for ZipFile.FixZipDirectory(string) The filename to of the zip file to fix. A wrapper for ZipFile.LibraryVersion the version number on the DotNetZip assembly, formatted as a string. An enum that provides the various encryption algorithms supported by this library. PkzipWeak implies the use of Zip 2.0 encryption, which is known to be weak and subvertible. A note on interoperability: Values of PkzipWeak and None are specified in PKWARE's zip specification, and are considered to be "standard". Zip archives produced using these options will be interoperable with many other zip tools and libraries, including Windows Explorer. Values of WinZipAes128 and WinZipAes256 are not part of the Zip specification, but rather imply the use of a vendor-specific extension from WinZip. If you want to produce interoperable Zip archives, do not use these values. For example, if you produce a zip archive using WinZipAes256, you will be able to open it in Windows Explorer on Windows XP and Vista, but you will not be able to extract entries; trying this will lead to an "unspecified error". For this reason, some people have said that a zip archive that uses WinZip's AES encryption is not actually a zip archive at all. A zip archive produced this way will be readable with the WinZip tool (Version 11 and beyond). There are other third-party tools and libraries, both commercial and otherwise, that support WinZip's AES encryption. These will be able to read AES-encrypted zip archives produced by DotNetZip, and conversely applications that use DotNetZip to read zip archives will be able to read AES-encrypted archives produced by those tools or libraries. Consult the documentation for those other tools and libraries to find out if WinZip's AES encryption is supported. In case you care: According to the WinZip specification, the actual AES key used is derived from the via an algorithm that complies with RFC 2898, using an iteration count of 1000. The algorithm is sometimes referred to as PBKDF2, which stands for "Password Based Key Derivation Function #2". A word about password strength and length: The AES encryption technology is very good, but any system is only as secure as the weakest link. If you want to secure your data, be sure to use a password that is hard to guess. To make it harder to guess (increase its "entropy"), you should make it longer. If you use normal characters from an ASCII keyboard, a password of length 20 will be strong enough that it will be impossible to guess. For more information on that, I'd encourage you to read this article. The WinZip AES algorithms are not supported with the version of DotNetZip that runs on the .NET Compact Framework. This is because .NET CF lacks the HMACSHA1 class that is required for producing the archive. No encryption at all. Traditional or Classic pkzip encryption. An encryption algorithm that is not supported by DotNetZip. Delegate in which the application writes the ZipEntry content for the named entry. The name of the entry that must be written. The stream to which the entry data should be written. When you add an entry and specify a WriteDelegate, via , the application code provides the logic that writes the entry data directly into the zip file. This example shows how to define a WriteDelegate that obtains a DataSet, and then writes the XML for the DataSet into the zip archive. There's no need to save the XML to a disk file first. private void WriteEntry (String filename, Stream output) { DataSet ds1 = ObtainDataSet(); ds1.WriteXml(output); } private void Run() { using (var zip = new ZipFile()) { zip.AddEntry(zipEntryName, WriteEntry); zip.Save(zipFileName); } } Private Sub WriteEntry (ByVal filename As String, ByVal output As Stream) DataSet ds1 = ObtainDataSet() ds1.WriteXml(stream) End Sub Public Sub Run() Using zip = New ZipFile zip.AddEntry(zipEntryName, New WriteDelegate(AddressOf WriteEntry)) zip.Save(zipFileName) End Using End Sub Delegate in which the application opens the stream, just-in-time, for the named entry. The name of the ZipEntry that the application should open the stream for. When you add an entry via , the application code provides the logic that opens and closes the stream for the given ZipEntry. Delegate in which the application closes the stream, just-in-time, for the named entry. The name of the ZipEntry that the application should close the stream for. The stream to be closed. When you add an entry via , the application code provides the logic that opens and closes the stream for the given ZipEntry. Delegate for the callback by which the application tells the library the CompressionLevel to use for a file. Using this callback, the application can, for example, specify that previously-compressed files (.mp3, .png, .docx, etc) should use a CompressionLevel of None, or can set the compression level based on any other factor. In an EventArgs type, indicates which sort of progress event is being reported. There are events for reading, events for saving, and events for extracting. This enumeration allows a single EventArgs type to be sued to describe one of multiple subevents. For example, a SaveProgress event is invoked before, after, and during the saving of a single entry. The value of an enum with this type, specifies which event is being triggered. The same applies to Extraction, Reading and Adding events. Indicates that a Add() operation has started. Indicates that an individual entry in the archive has been added. Indicates that a Add() operation has completed. Indicates that a Read() operation has started. Indicates that an individual entry in the archive is about to be read. Indicates that an individual entry in the archive has just been read. Indicates that a Read() operation has completed. The given event reports the number of bytes read so far during a Read() operation. Indicates that a Save() operation has started. Indicates that an individual entry in the archive is about to be written. Indicates that an individual entry in the archive has just been saved. Indicates that a Save() operation has completed. Indicates that the zip archive has been created in a temporary location during a Save() operation. Indicates that the temporary file is about to be renamed to the final archive name during a Save() operation. Indicates that the temporary file is has just been renamed to the final archive name during a Save() operation. Indicates that the self-extracting archive has been compiled during a Save() operation. The given event is reporting the number of source bytes that have run through the compressor so far during a Save() operation. Indicates that an entry is about to be extracted. Indicates that an entry has just been extracted. Indicates that extraction of an entry would overwrite an existing filesystem file. You must use ExtractExistingFileAction.InvokeExtractProgressEvent in the call to ZipEntry.Extract() in order to receive this event. The given event is reporting the number of bytes written so far for the current entry during an Extract() operation. Indicates that an ExtractAll operation is about to begin. Indicates that an ExtractAll operation has completed. Indicates that an error has occurred while saving a zip file. This generally means the file cannot be opened, because it has been removed, or because it is locked by another process. It can also mean that the file cannot be Read, because of a range lock conflict. Provides information about the progress of a save, read, or extract operation. This is a base class; you will probably use one of the classes derived from this one. The total number of entries to be saved or extracted. The name of the last entry saved or extracted. In an event handler, set this to cancel the save or extract operation that is in progress. The type of event being reported. Returns the archive name associated to this event. The number of bytes read or written so far for this entry. Total number of bytes that will be read or written for this entry. This number will be -1 if the value cannot be determined. Provides information about the progress of a Read operation. Provides information about the progress of a Add operation. Provides information about the progress of a save operation. Constructor for the SaveProgressEventArgs. the name of the zip archive. whether this is before saving the entry, or after The total number of entries in the zip archive. Number of entries that have been saved. The entry involved in the event. Number of entries saved so far. Provides information about the progress of the extract operation. Constructor for the ExtractProgressEventArgs. the name of the zip archive. whether this is before saving the entry, or after The total number of entries in the zip archive. Number of entries that have been extracted. The entry involved in the event. The location to which entries are extracted. Number of entries extracted so far. This is set only if the EventType is Extracting_BeforeExtractEntry or Extracting_AfterExtractEntry, and the Extract() is occurring witin the scope of a call to ExtractAll(). Returns the extraction target location, a filesystem path. Provides information about the an error that occurred while zipping. Returns the exception that occurred, if any. Returns the name of the file that caused the exception, if any. Issued when an ZipEntry.ExtractWithPassword() method is invoked with an incorrect password. Default ctor. Come on, you know how exceptions work. Why are you looking at this documentation? The message in the exception. Come on, you know how exceptions work. Why are you looking at this documentation? The message in the exception. The innerException for this exception. Indicates that a read was attempted on a stream, and bad or incomplete data was received. Default ctor. Come on, you know how exceptions work. Why are you looking at this documentation? The message in the exception. Come on, you know how exceptions work. Why are you looking at this documentation? The message in the exception. The innerException for this exception. Issued when an CRC check fails upon extracting an entry from a zip archive. Default ctor. Come on, you know how exceptions work. Why are you looking at this documentation? The message in the exception. Issued when errors occur saving a self-extracting archive. Default ctor. Come on, you know how exceptions work. Why are you looking at this documentation? The message in the exception. Default ctor. Come on, you know how exceptions work. Why are you looking at this documentation? The message in the exception. Come on, you know how exceptions work. Why are you looking at this documentation? The message in the exception. The innerException for this exception. Base class for all exceptions defined by and throw by the Zip library. Default ctor. Come on, you know how exceptions work. Why are you looking at this documentation? The message in the exception. Come on, you know how exceptions work. Why are you looking at this documentation? The message in the exception. The innerException for this exception. An enum for the options when extracting an entry would overwrite an existing file. This enum describes the actions that the library can take when an Extract() or ExtractWithPassword() method is called to extract an entry to a filesystem, and the extraction would overwrite an existing filesystem file. Throw an exception when extraction would overwrite an existing file. (For COM clients, this is a 0 (zero).) When extraction would overwrite an existing file, overwrite the file silently. The overwrite will happen even if the target file is marked as read-only. (For COM clients, this is a 1.) When extraction would overwrite an existing file, don't overwrite the file, silently. (For COM clients, this is a 2.) When extraction would overwrite an existing file, invoke the ExtractProgress event, using an event type of . In this way, the application can decide, just-in-time, whether to overwrite the file. For example, a GUI application may wish to pop up a dialog to allow the user to choose. You may want to examine the property before making the decision. If, after your processing in the Extract progress event, you want to NOT extract the file, set on the ZipProgressEventArgs.CurrentEntry to DoNotOverwrite. If you do want to extract the file, set ZipEntry.ExtractExistingFile to OverwriteSilently. If you want to cancel the Extraction, set ZipProgressEventArgs.Cancel to true. Cancelling differs from using DoNotOverwrite in that a cancel will not extract any further entries, if there are any. (For COM clients, the value of this enum is a 3.) Collects general purpose utility methods. private null constructor Utility routine for transforming path names from filesystem format (on Windows that means backslashes) to a format suitable for use within zipfiles. This means trimming the volume letter and colon (if any) And swapping backslashes for forward slashes. source path. transformed path Finds a signature in the zip stream. This is useful for finding the end of a zip entry, for example, or the beginning of the next ZipEntry. Scans through 64k at a time. If the method fails to find the requested signature, the stream Position after completion of this method is unchanged. If the method succeeds in finding the requested signature, the stream position after completion is direct AFTER the signature found in the stream. The stream to search The 4-byte signature to find The number of bytes read Create a pseudo-random filename, suitable for use as a temporary file, and open it. The System.IO.Path.GetRandomFileName() method is not available on the Compact Framework, so this library provides its own substitute on NETCF. This method produces a filename of the form DotNetZip-xxxxxxxx.tmp, where xxxxxxxx is replaced by randomly chosen characters, and creates that file. Workitem 7889: handle ERROR_LOCK_VIOLATION during read This could be gracefully handled with an extension attribute, but This assembly is built for .NET 2.0, so I cannot use them. A decorator stream. It wraps another stream, and performs bookkeeping to keep track of the stream Position. In some cases, it is not possible to get the Position of a stream, let's say, on a write-only output stream like ASP.NET's Response.OutputStream, or on a different write-only stream provided as the destination for the zip by the application. In this case, programmers can use this counting stream to count the bytes read or written. Consider the scenario of an application that saves a self-extracting archive (SFX), that uses a custom SFX stub. Saving to a filesystem file, the application would open the filesystem file (getting a FileStream), save the custom sfx stub into it, and then call ZipFile.Save(), specifying the same FileStream. ZipFile.Save() does the right thing for the zipentry offsets, by inquiring the Position of the FileStream before writing any data, and then adding that initial offset into any ZipEntry offsets in the zip directory. Everything works fine. Now suppose the application is an ASPNET application and it saves directly to Response.OutputStream. It's not possible for DotNetZip to inquire the Position, so the offsets for the SFX will be wrong. The workaround is for the application to use this class to wrap HttpResponse.OutputStream, then write the SFX stub and the ZipFile into that wrapper stream. Because ZipFile.Save() can inquire the Position, it will then do the right thing with the offsets. The constructor. The underlying stream Gets the wrapped stream. The count of bytes written out to the stream. the count of bytes that have been read from the stream. Adjust the byte count on the stream. the number of bytes to subtract from the count. Subtract delta from the count of bytes written to the stream. This is necessary when seeking back, and writing additional data, as happens in some cases when saving Zip files. The read method. The buffer to hold the data read from the stream. the offset within the buffer to copy the first byte read. the number of bytes to read. the number of bytes read, after decryption and decompression. Write data into the stream. The buffer holding data to write to the stream. the offset within that data array to find the first byte to write. the number of bytes to write. Whether the stream can be read. Whether it is possible to call Seek() on the stream. Whether it is possible to call Write() on the stream. Flushes the underlying stream. The length of the underlying stream. Returns the sum of number of bytes written, plus the initial offset before writing. The Position of the stream. Seek in the stream. the offset point to seek to the reference point from which to seek The new position Set the length of the underlying stream. Be careful with this! the length to set on the underlying stream. This class implements the "traditional" or "classic" PKZip encryption, which today is considered to be weak. On the other hand it is ubiquitous. This class is intended for use only by the DotNetZip library. Most uses of the DotNetZip library will not involve direct calls into the ZipCrypto class. Instead, the ZipCrypto class is instantiated and used by the ZipEntry() class when encryption or decryption on an entry is employed. If for some reason you really wanted to use a weak encryption algorithm in some other application, you might use this library. But you would be much better off using one of the built-in strong encryption libraries in the .NET Framework, like the AES algorithm or SHA. The default constructor for ZipCrypto. This class is intended for internal use by the library only. It's probably not useful to you. Seriously. Stop reading this documentation. It's a waste of your time. Go do something else. Check the football scores. Go get an ice cream with a friend. Seriously. From AppNote.txt: unsigned char decrypt_byte() local unsigned short temp temp :=- Key(2) | 2 decrypt_byte := (temp * (temp ^ 1)) bitshift-right 8 end decrypt_byte Call this method on a cipher text to render the plaintext. You must first initialize the cipher with a call to InitCipher. var cipher = new ZipCrypto(); cipher.InitCipher(Password); // Decrypt the header. This has a side effect of "further initializing the // encryption keys" in the traditional zip encryption. byte[] DecryptedMessage = cipher.DecryptMessage(EncryptedMessage); The encrypted buffer. The number of bytes to encrypt. Should be less than or equal to CipherText.Length. The plaintext. This is the converse of DecryptMessage. It encrypts the plaintext and produces a ciphertext. The plain text buffer. The number of bytes to encrypt. Should be less than or equal to plainText.Length. The ciphertext. This initializes the cipher with the given password. See AppNote.txt for details. The passphrase for encrypting or decrypting with this cipher. Step 1 - Initializing the encryption keys ----------------------------------------- Start with these keys: Key(0) := 305419896 (0x12345678) Key(1) := 591751049 (0x23456789) Key(2) := 878082192 (0x34567890) Then, initialize the keys with a password: loop for i from 0 to length(password)-1 update_keys(password(i)) end loop Where update_keys() is defined as: update_keys(char): Key(0) := crc32(key(0),char) Key(1) := Key(1) + (Key(0) bitwiseAND 000000ffH) Key(1) := Key(1) * 134775813 + 1 Key(2) := crc32(key(2),key(1) rightshift 24) end update_keys Where crc32(old_crc,char) is a routine that given a CRC value and a character, returns an updated CRC value after applying the CRC-32 algorithm described elsewhere in this document. After the keys are initialized, then you can use the cipher to encrypt the plaintext. Essentially we encrypt the password with the keys, then discard the ciphertext for the password. This initializes the keys for later use. A Stream for reading and concurrently decrypting data from a zip file, or for writing and concurrently encrypting data to a zip file. The constructor. The underlying stream To either encrypt or decrypt. The pre-initialized ZipCrypto object. Represents a single entry in a ZipFile. Typically, applications get a ZipEntry by enumerating the entries within a ZipFile, or by adding an entry to a ZipFile. True if the referenced entry is a directory. Provides a human-readable string with information about the ZipEntry. Reads one entry from the zip directory structure in the zip file. The zipfile for which a directory entry will be read. From this param, the method gets the ReadStream and the expected text encoding (ProvisionalAlternateEncoding) which is used if the entry is not marked UTF-8. a list of previously seen entry names; used to prevent duplicates. the entry read from the archive. Returns true if the passed-in value is a valid signature for a ZipDirEntry. the candidate 4-byte signature value. true, if the signature is valid according to the PKWare spec. Default constructor. Applications should never need to call this directly. It is exposed to support COM Automation environments. The time and date at which the file indicated by the ZipEntry was last modified. The DotNetZip library sets the LastModified value for an entry, equal to the Last Modified time of the file in the filesystem. If an entry is added from a stream, the library uses System.DateTime.Now for this value, for the given entry. This property allows the application to retrieve and possibly set the LastModified value on an entry, to an arbitrary value. values with a setting of DateTimeKind.Unspecified are taken to be expressed as DateTimeKind.Local. Be aware that because of the way PKWare's Zip specification describes how times are stored in the zip file, the full precision of the System.DateTime datatype is not stored for the last modified time when saving zip files. For more information on how times are formatted, see the PKZip specification. The actual last modified time of a file can be stored in multiple ways in the zip file, and they are not mutually exclusive: In the so-called "DOS" format, which has a 2-second precision. Values are rounded to the nearest even second. For example, if the time on the file is 12:34:43, then it will be stored as 12:34:44. This first value is accessible via the LastModified property. This value is always present in the metadata for each zip entry. In some cases the value is invalid, or zero. In the so-called "Windows" or "NTFS" format, as an 8-byte integer quantity expressed as the number of 1/10 milliseconds (in other words the number of 100 nanosecond units) since January 1, 1601 (UTC). This format is how Windows represents file times. This time is accessible via the ModifiedTime property. In the "Unix" format, a 4-byte quantity specifying the number of seconds since January 1, 1970 UTC. In an older format, now deprecated but still used by some current tools. This format is also a 4-byte quantity specifying the number of seconds since January 1, 1970 UTC. Zip tools and libraries will always at least handle (read or write) the DOS time, and may also handle the other time formats. Keep in mind that while the names refer to particular operating systems, there is nothing in the time formats themselves that prevents their use on other operating systems. When reading ZIP files, the DotNetZip library reads the Windows-formatted time, if it is stored in the entry, and sets both LastModified and ModifiedTime to that value. When writing ZIP files, the DotNetZip library by default will write both time quantities. It can also emit the Unix-formatted time if desired (See .) The last modified time of the file created upon a call to ZipEntry.Extract() may be adjusted during extraction to compensate for differences in how the .NET Base Class Library deals with daylight saving time (DST) versus how the Windows filesystem deals with daylight saving time. Raymond Chen provides some good context. In a nutshell: Daylight savings time rules change regularly. In 2007, for example, the inception week of DST changed. In 1977, DST was in place all year round. In 1945, likewise. And so on. Win32 does not attempt to guess which time zone rules were in effect at the time in question. It will render a time as "standard time" and allow the app to change to DST as necessary. .NET makes a different choice. Compare the output of FileInfo.LastWriteTime.ToString("f") with what you see in the Windows Explorer property sheet for a file that was last written to on the other side of the DST transition. For example, suppose the file was last modified on October 17, 2003, during DST but DST is not currently in effect. Explorer's file properties reports Thursday, October 17, 2003, 8:45:38 AM, but .NETs FileInfo reports Thursday, October 17, 2003, 9:45 AM. Win32 says, "Thursday, October 17, 2002 8:45:38 AM PST". Note: Pacific STANDARD Time. Even though October 17 of that year occurred during Pacific Daylight Time, Win32 displays the time as standard time because that's what time it is NOW. .NET BCL assumes that the current DST rules were in place at the time in question. So, .NET says, "Well, if the rules in effect now were also in effect on October 17, 2003, then that would be daylight time" so it displays "Thursday, October 17, 2003, 9:45 AM PDT" - daylight time. So .NET gives a value which is more intuitively correct, but is also potentially incorrect, and which is not invertible. Win32 gives a value which is intuitively incorrect, but is strictly correct. Because of this funkiness, this library adds one hour to the LastModified time on the extracted file, if necessary. That is to say, if the time in question had occurred in what the .NET Base Class Library assumed to be DST. This assumption may be wrong given the constantly changing DST rules, but it is the best we can do. Last Modified time for the file represented by the entry. This value corresponds to the "last modified" time in the NTFS file times as described in the Zip specification. When getting this property, the value may be different from . When setting the property, the property also gets set, but with a lower precision. Let me explain. It's going to take a while, so get comfortable. Originally, waaaaay back in 1989 when the ZIP specification was originally described by the esteemed Mr. Phil Katz, the dominant operating system of the time was MS-DOS. MSDOS stored file times with a 2-second precision, because, c'mon, who is ever going to need better resolution than THAT? And so ZIP files, regardless of the platform on which the zip file was created, store file times in exactly the same format that DOS used in 1989. Since then, the ZIP spec has evolved, but the internal format for file timestamps remains the same. Despite the fact that the way times are stored in a zip file is rooted in DOS heritage, any program on any operating system can format a time in this way, and most zip tools and libraries DO - they round file times to the nearest even second and store it just like DOS did 25+ years ago. PKWare extended the ZIP specification to allow a zip file to store what are called "NTFS Times" and "Unix(tm) times" for a file. These are the last write, last access, and file creation times of a particular file. These metadata are not actually specific to NTFS or Unix. They are tracked for each file by NTFS and by various Unix filesystems, but they are also tracked by other filesystems, too. The key point is that the times are formatted in the zip file in the same way that NTFS formats the time (ticks since win32 epoch), or in the same way that Unix formats the time (seconds since Unix epoch). As with the DOS time, any tool or library running on any operating system is capable of formatting a time in one of these ways and embedding it into the zip file. These extended times are higher precision quantities than the DOS time. As described above, the (DOS) LastModified has a precision of 2 seconds. The Unix time is stored with a precision of 1 second. The NTFS time is stored with a precision of 0.0000001 seconds. The quantities are easily convertible, except for the loss of precision you may incur. A zip archive can store the {C,A,M} times in NTFS format, in Unix format, or not at all. Often a tool running on Unix or Mac will embed the times in Unix format (1 second precision), while WinZip running on Windows might embed the times in NTFS format (precision of of 0.0000001 seconds). When reading a zip file with these "extended" times, in either format, DotNetZip represents the values with the ModifiedTime, AccessedTime and CreationTime properties on the ZipEntry. While any zip application or library, regardless of the platform it runs on, could use any of the time formats allowed by the ZIP specification, not all zip tools or libraries do support all these formats. Storing the higher-precision times for each entry is optional for zip files, and many tools and libraries don't use the higher precision quantities at all. The old DOS time, represented by , is guaranteed to be present, though it sometimes unset. Ok, getting back to the question about how the LastModified property relates to this ModifiedTime property... LastModified is always set, while ModifiedTime is not. (The other times stored in the NTFS times extension, CreationTime and AccessedTime also may not be set on an entry that is read from an existing zip file.) When reading a zip file, then LastModified takes the DOS time that is stored with the file. If the DOS time has been stored as zero in the zipfile, then this library will use DateTime.Now for the LastModified value. If the ZIP file was created by an evolved tool, then there will also be higher precision NTFS or Unix times in the zip file. In that case, this library will read those times, and set LastModified and ModifiedTime to the same value, the one corresponding to the last write time of the file. If there are no higher precision times stored for the entry, then ModifiedTime remains unset (likewise AccessedTime and CreationTime), and LastModified keeps its DOS time. When creating zip files with this library, by default the extended time properties (ModifiedTime, AccessedTime, and CreationTime) are set on the ZipEntry instance, and these data are stored in the zip archive for each entry, in NTFS format. If you add an entry from an actual filesystem file, then the entry gets the actual file times for that file, to NTFS-level precision. If you add an entry from a stream, or a string, then the times get the value DateTime.Now. In this case LastModified and ModifiedTime will be identical, to 2 seconds of precision. You can explicitly set the CreationTime, AccessedTime, and ModifiedTime of an entry using the property setters. If you want to set all of those quantities, it's more efficient to use the method. Those changes are not made permanent in the zip file until you call or one of its cousins. When creating a zip file, you can override the default behavior of this library for formatting times in the zip file, disabling the embedding of file times in NTFS format or enabling the storage of file times in Unix format, or both. You may want to do this, for example, when creating a zip file on Windows, that will be consumed on a Mac, by an application that is not hip to the "NTFS times" format. To do this, use the and properties. A valid zip file may store the file times in both formats. But, there are no guarantees that a program running on Mac or Linux will gracefully handle the NTFS-formatted times when Unix times are present, or that a non-DotNetZip-powered application running on Windows will be able to handle file times in Unix format. DotNetZip will always do something reasonable; other libraries or tools may not. When in doubt, test. I'll bet you didn't think one person could type so much about time, eh? And reading it was so enjoyable, too! Well, in appreciation, maybe you should donate? Last Access time for the file represented by the entry. This value may or may not be meaningful. If the ZipEntry was read from an existing Zip archive, this information may not be available. For an explanation of why, see . The file creation time for the file represented by the entry. This value may or may not be meaningful. If the ZipEntry was read from an existing zip archive, and the creation time was not set on the entry when the zip file was created, then this property may be meaningless. For an explanation of why, see . Sets the NTFS Creation, Access, and Modified times for the given entry. When adding an entry from a file or directory, the Creation, Access, and Modified times for the given entry are automatically set from the filesystem values. When adding an entry from a stream or string, the values are implicitly set to DateTime.Now. The application may wish to set these values to some arbitrary value, before saving the archive, and can do so using the various setters. If you want to set all of the times, this method is more efficient. The values you set here will be retrievable with the , and properties. When this method is called, if both and are false, then the EmitTimesInWindowsFormatWhenSaving flag is automatically set. DateTime values provided here without a DateTimeKind are assumed to be Local Time. the creation time of the entry. the last access time of the entry. the last modified time of the entry. Specifies whether the Creation, Access, and Modified times for the given entry will be emitted in "Windows format" when the zip archive is saved. An application creating a zip archive can use this flag to explicitly specify that the file times for the entry should or should not be stored in the zip archive in the format used by Windows. The default value of this property is true. When adding an entry from a file or directory, the Creation (), Access (), and Modified () times for the given entry are automatically set from the filesystem values. When adding an entry from a stream or string, all three values are implicitly set to DateTime.Now. Applications can also explicitly set those times by calling . PKWARE's zip specification describes multiple ways to format these times in a zip file. One is the format Windows applications normally use: 100ns ticks since Jan 1, 1601 UTC. The other is a format Unix applications typically use: seconds since January 1, 1970 UTC. Each format can be stored in an "extra field" in the zip entry when saving the zip archive. The former uses an extra field with a Header Id of 0x000A, while the latter uses a header ID of 0x5455. Not all zip tools and libraries can interpret these fields. Windows compressed folders is one that can read the Windows Format timestamps, while I believe the Infozip tools can read the Unix format timestamps. Although the time values are easily convertible, subject to a loss of precision, some tools and libraries may be able to read only one or the other. DotNetZip can read or write times in either or both formats. The times stored are taken from , , and . This property is not mutually exclusive from the property. It is possible that a zip entry can embed the timestamps in both forms, one form, or neither. But, there are no guarantees that a program running on Mac or Linux will gracefully handle NTFS Formatted times, or that a non-DotNetZip-powered application running on Windows will be able to handle file times in Unix format. When in doubt, test. Normally you will use the ZipFile.EmitTimesInWindowsFormatWhenSaving property, to specify the behavior for all entries in a zip, rather than the property on each individual entry. Specifies whether the Creation, Access, and Modified times for the given entry will be emitted in "Unix(tm) format" when the zip archive is saved. An application creating a zip archive can use this flag to explicitly specify that the file times for the entry should or should not be stored in the zip archive in the format used by Unix. By default this flag is false, meaning the Unix-format times are not stored in the zip archive. When adding an entry from a file or directory, the Creation (), Access (), and Modified () times for the given entry are automatically set from the filesystem values. When adding an entry from a stream or string, all three values are implicitly set to DateTime.Now. Applications can also explicitly set those times by calling . PKWARE's zip specification describes multiple ways to format these times in a zip file. One is the format Windows applications normally use: 100ns ticks since Jan 1, 1601 UTC. The other is a format Unix applications typically use: seconds since Jan 1, 1970 UTC. Each format can be stored in an "extra field" in the zip entry when saving the zip archive. The former uses an extra field with a Header Id of 0x000A, while the latter uses a header ID of 0x5455. Not all tools and libraries can interpret these fields. Windows compressed folders is one that can read the Windows Format timestamps, while I believe the Infozip tools can read the Unix format timestamps. Although the time values are easily convertible, subject to a loss of precision, some tools and libraries may be able to read only one or the other. DotNetZip can read or write times in either or both formats. The times stored are taken from , , and . This property is not mutually exclusive from the property. It is possible that a zip entry can embed the timestamps in both forms, one form, or neither. But, there are no guarantees that a program running on Mac or Linux will gracefully handle NTFS Formatted times, or that a non-DotNetZip-powered application running on Windows will be able to handle file times in Unix format. When in doubt, test. Normally you will use the ZipFile.EmitTimesInUnixFormatWhenSaving property, to specify the behavior for all entries, rather than the property on each individual entry. The type of timestamp attached to the ZipEntry. This property is valid only for a ZipEntry that was read from a zip archive. It indicates the type of timestamp attached to the entry. The file attributes for the entry. The attributes in NTFS include ReadOnly, Archive, Hidden, System, and Indexed. When adding a ZipEntry to a ZipFile, these attributes are set implicitly when adding an entry from the filesystem. When adding an entry from a stream or string, the Attributes are not set implicitly. Regardless of the way an entry was added to a ZipFile, you can set the attributes explicitly if you like. When reading a ZipEntry from a ZipFile, the attributes are set according to the data stored in the ZipFile. If you extract the entry from the archive to a filesystem file, DotNetZip will set the attributes on the resulting file accordingly. The attributes can be set explicitly by the application. For example the application may wish to set the FileAttributes.ReadOnly bit for all entries added to an archive, so that on unpack, this attribute will be set on the extracted file. Any changes you make to this property are made permanent only when you call a Save() method on the ZipFile instance that contains the ZipEntry. For example, an application may wish to zip up a directory and set the ReadOnly bit on every file in the archive, so that upon later extraction, the resulting files will be marked as ReadOnly. Not every extraction tool respects these attributes, but if you unpack with DotNetZip, as for example in a self-extracting archive, then the attributes will be set as they are stored in the ZipFile. These attributes may not be interesting or useful if the resulting archive is extracted on a non-Windows platform. How these attributes get used upon extraction depends on the platform and tool used. This property is only partially supported in the Silverlight version of the library: applications can read attributes on entries within ZipFiles. But extracting entries within Silverlight will not set the attributes on the extracted files. The name of the filesystem file, referred to by the ZipEntry. This property specifies the thing-to-be-zipped on disk, and is set only when the ZipEntry is being created from a filesystem file. If the ZipFile is instantiated by reading an existing .zip archive, then the LocalFileName will be null (Nothing in VB). When it is set, the value of this property may be different than , which is the path used in the archive itself. If you call Zip.AddFile("foop.txt", AlternativeDirectory), then the path used for the ZipEntry within the zip archive will be different than this path. If the entry is being added from a stream, then this is null (Nothing in VB). The name of the file contained in the ZipEntry. This is the name of the entry in the ZipFile itself. When creating a zip archive, if the ZipEntry has been created from a filesystem file, via a call to or , or a related overload, the value of this property is derived from the name of that file. The FileName property does not include drive letters, and may include a different directory path, depending on the value of the directoryPathInArchive parameter used when adding the entry into the ZipFile. In some cases there is no related filesystem file - for example when a ZipEntry is created using or one of the similar overloads. In this case, the value of this property is derived from the fileName and the directory path passed to that method. When reading a zip file, this property takes the value of the entry name as stored in the zip file. If you extract such an entry, the extracted file will take the name given by this property. Applications can set this property when creating new zip archives or when reading existing archives. When setting this property, the actual value that is set will replace backslashes with forward slashes, in accordance with the Zip specification, for compatibility with Unix(tm) and ... get this.... Amiga! If an application reads a ZipFile via or a related overload, and then explicitly sets the FileName on an entry contained within the ZipFile, and then calls , the application will effectively rename the entry within the zip archive. If an application sets the value of FileName, then calls Extract() on the entry, the entry is extracted to a file using the newly set value as the filename. The FileName value is made permanent in the zip archive only after a call to one of the ZipFile.Save() methods on the ZipFile that contains the ZipEntry. If an application attempts to set the FileName to a value that would result in a duplicate entry in the ZipFile, an exception is thrown. When a ZipEntry is contained within a ZipFile, applications cannot rename the entry within the context of a foreach (For Each in VB) loop, because of the way the ZipFile stores entries. If you need to enumerate through all the entries and rename one or more of them, use ZipFile.EntriesSorted as the collection. See also, ZipFile.GetEnumerator(). The stream that provides content for the ZipEntry. The application can use this property to set the input stream for an entry on a just-in-time basis. Imagine a scenario where the application creates a ZipFile comprised of content obtained from hundreds of files, via calls to AddFile(). The DotNetZip library opens streams on these files on a just-in-time basis, only when writing the entry out to an external store within the scope of a ZipFile.Save() call. Only one input stream is opened at a time, as each entry is being written out. Now imagine a different application that creates a ZipFile with content obtained from hundreds of streams, added through . Normally the application would supply an open stream to that call. But when large numbers of streams are being added, this can mean many open streams at one time, unnecessarily. To avoid this, call and specify delegates that open and close the stream at the time of Save. Setting the value of this property when the entry was not added from a stream (for example, when the ZipEntry was added with or , or when the entry was added by reading an existing zip archive) will throw an exception. A flag indicating whether the InputStream was provided Just-in-time. When creating a zip archive, an application can obtain content for one or more of the ZipEntry instances from streams, using the method. At the time of calling that method, the application can supply null as the value of the stream parameter. By doing so, the application indicates to the library that it will provide a stream for the entry on a just-in-time basis, at the time one of the ZipFile.Save() methods is called and the data for the various entries are being compressed and written out. In this case, the application can set the property, typically within the SaveProgress event (event type: ) for that entry. The application will later want to call Close() and Dispose() on that stream. In the SaveProgress event, when the event type is , the application can do so. This flag indicates that the stream has been provided by the application on a just-in-time basis and that it is the application's responsibility to call Close/Dispose on that stream. An enum indicating the source of the ZipEntry. The version of the zip engine needed to read the ZipEntry. This is a readonly property, indicating the version of the Zip specification that the extracting tool or library must support to extract the given entry. Generally higher versions indicate newer features. Older zip engines obviously won't know about new features, and won't be able to extract entries that depend on those newer features. value Features 20 a basic Zip Entry, potentially using PKZIP encryption. 45 The ZIP64 extension is used on the entry. 46 File is compressed using BZIP2 compression* 50 File is encrypted using PkWare's DES, 3DES, (broken) RC2 or RC4 51 File is encrypted using PKWare's AES encryption or corrected RC2 encryption. 52 File is encrypted using corrected RC2-64 encryption** 61 File is encrypted using non-OAEP key wrapping*** 63 File is compressed using LZMA, PPMd+, Blowfish, or Twofish There are other values possible, not listed here. DotNetZip supports regular PKZip encryption, and ZIP64 extensions. DotNetZip cannot extract entries that require a zip engine higher than 45. This value is set upon reading an existing zip file, or after saving a zip archive. The comment attached to the ZipEntry. Each entry in a zip file can optionally have a comment associated to it. The comment might be displayed by a zip tool during extraction, for example. By default, the Comment is encoded in IBM437 code page. You can specify an alternative with and . Indicates whether the entry requires ZIP64 extensions. This property is null (Nothing in VB) until a Save() method on the containing instance has been called. The property is non-null (HasValue is true) only after a Save() method has been called. After the containing ZipFile has been saved, the Value of this property is true if any of the following three conditions holds: the uncompressed size of the entry is larger than 0xFFFFFFFF; the compressed size of the entry is larger than 0xFFFFFFFF; the relative offset of the entry within the zip archive is larger than 0xFFFFFFFF. These quantities are not known until a Save() is attempted on the zip archive and the compression is applied. If none of the three conditions holds, then the Value is false. A Value of false does not indicate that the entry, as saved in the zip archive, does not use ZIP64. It merely indicates that ZIP64 is not required. An entry may use ZIP64 even when not required if the property on the containing ZipFile instance is set to , or if the property on the containing ZipFile instance is set to and the output stream was not seekable. Indicates whether the entry actually used ZIP64 extensions, as it was most recently written to the output file or stream. This Nullable property is null (Nothing in VB) until a Save() method on the containing instance has been called. HasValue is true only after a Save() method has been called. The value of this property for a particular ZipEntry may change over successive calls to Save() methods on the containing ZipFile, even if the file that corresponds to the ZipEntry does not. This may happen if other entries contained in the ZipFile expand, causing the offset for this particular entry to exceed 0xFFFFFFFF. The bitfield for the entry as defined in the zip spec. You probably never need to look at this. You probably do not need to concern yourself with the contents of this property, but in case you do: bit meaning 0 set if encryption is used. 1-2 set to determine whether normal, max, fast deflation. DotNetZip library always leaves these bits unset when writing (indicating "normal" deflation"), but can read an entry with any value here. 3 Indicates that the Crc32, Compressed and Uncompressed sizes are zero in the local header. This bit gets set on an entry during writing a zip file, when it is saved to a non-seekable output stream. 4 reserved for "enhanced deflating". This library doesn't do enhanced deflating. 5 set to indicate the zip is compressed patched data. This library doesn't do that. 6 set if PKWare's strong encryption is used (must also set bit 1 if bit 6 is set). This bit is not set if WinZip's AES encryption is set. 7 not used 8 not used 9 not used 10 not used 11 Language encoding flag (EFS). If this bit is set, the filename and comment fields for this file must be encoded using UTF-8. This library currently does not support UTF-8. 12 Reserved by PKWARE for enhanced compression. 13 Used when encrypting the Central Directory to indicate selected data values in the Local Header are masked to hide their actual values. See the section in the Zip specification describing the Strong Encryption Specification for details. 14 Reserved by PKWARE. 15 Reserved by PKWARE. The compression method employed for this ZipEntry. The Zip specification allows a variety of compression methods. This library supports just two: 0x08 = Deflate. 0x00 = Store (no compression), for reading or writing. When reading an entry from an existing zipfile, the value you retrieve here indicates the compression method used on the entry by the original creator of the zip. When writing a zipfile, you can specify either 0x08 (Deflate) or 0x00 (None). If you try setting something else, you will get an exception. You may wish to set CompressionMethod to CompressionMethod.None (0) when zipping already-compressed data like a jpg, png, or mp3 file. This can save time and cpu cycles. When setting this property on a ZipEntry that is read from an existing zip file, calling ZipFile.Save() will cause the new CompressionMethod to be used on the entry in the newly saved zip file. Setting this property may have the side effect of modifying the CompressionLevel property. If you set the CompressionMethod to a value other than None, and CompressionLevel is previously set to None, then CompressionLevel will be set to Default. In this example, the first entry added to the zip archive uses the default behavior - compression is used where it makes sense. The second entry, the MP3 file, is added to the archive without being compressed. using (ZipFile zip = new ZipFile(ZipFileToCreate)) { ZipEntry e1= zip.AddFile(@"notes\Readme.txt"); ZipEntry e2= zip.AddFile(@"music\StopThisTrain.mp3"); e2.CompressionMethod = CompressionMethod.None; zip.Save(); } Using zip As New ZipFile(ZipFileToCreate) zip.AddFile("notes\Readme.txt") Dim e2 as ZipEntry = zip.AddFile("music\StopThisTrain.mp3") e2.CompressionMethod = CompressionMethod.None zip.Save End Using Sets the compression level to be used for the entry when saving the zip archive. This applies only for CompressionMethod = DEFLATE. When using the DEFLATE compression method, Varying the compression level used on entries can affect the size-vs-speed tradeoff when compression and decompressing data streams or files. If you do not set this property, the default compression level is used, which normally gives a good balance of compression efficiency and compression speed. In some tests, using BestCompression can double the time it takes to compress, while delivering just a small increase in compression efficiency. This behavior will vary with the type of data you compress. If you are in doubt, just leave this setting alone, and accept the default. When setting this property on a ZipEntry that is read from an existing zip file, calling ZipFile.Save() will cause the new CompressionLevel to be used on the entry in the newly saved zip file. Setting this property may have the side effect of modifying the CompressionMethod property. If you set the CompressionLevel to a value other than None, CompressionMethod will be set to Deflate, if it was previously None. Setting this property has no effect if the CompressionMethod is something other than Deflate or None. The compressed size of the file, in bytes, within the zip archive. When reading a ZipFile, this value is read in from the existing zip file. When creating or updating a ZipFile, the compressed size is computed during compression. Therefore the value on a ZipEntry is valid after a call to Save() (or one of its overloads) in that case. The size of the file, in bytes, before compression, or after extraction. When reading a ZipFile, this value is read in from the existing zip file. When creating or updating a ZipFile, the uncompressed size is computed during compression. Therefore the value on a ZipEntry is valid after a call to Save() (or one of its overloads) in that case. The ratio of compressed size to uncompressed size of the ZipEntry. This is a ratio of the compressed size to the uncompressed size of the entry, expressed as a double in the range of 0 to 100+. A value of 100 indicates no compression at all. It could be higher than 100 when the compression algorithm actually inflates the data, as may occur for small files, or uncompressible data that is encrypted. You could format it for presentation to a user via a format string of "{3,5:F0}%" to see it as a percentage. If the size of the original uncompressed file is 0, implying a denominator of 0, the return value will be zero. This property is valid after reading in an existing zip file, or after saving the ZipFile that contains the ZipEntry. You cannot know the effect of a compression transform until you try it. The 32-bit CRC (Cyclic Redundancy Check) on the contents of the ZipEntry. You probably don't need to concern yourself with this. It is used internally by DotNetZip to verify files or streams upon extraction. The value is a 32-bit CRC using 0xEDB88320 for the polynomial. This is the same CRC-32 used in PNG, MPEG-2, and other protocols and formats. It is a read-only property; when creating a Zip archive, the CRC for each entry is set only after a call to Save() on the containing ZipFile. When reading an existing zip file, the value of this property reflects the stored CRC for the entry. True if the entry is a directory (not a file). This is a readonly property on the entry. A derived property that is true if the entry uses encryption. This is a readonly property on the entry. When reading a zip file, the value for the ZipEntry is determined by the data read from the zip file. After saving a ZipFile, the value of this property for each ZipEntry indicates whether encryption was actually used (which will have been true if the was set and the property was something other than . Set this to specify which encryption algorithm to use for the entry when saving it to a zip archive. Set this property in order to encrypt the entry when the ZipFile is saved. When setting this property, you must also set a on the entry. If you set a value other than on this property and do not set a Password then the entry will not be encrypted. The ZipEntry data is encrypted as the ZipFile is saved, when you call or one of its cousins on the containing ZipFile instance. You do not need to specify the Encryption when extracting entries from an archive. The Zip specification from PKWare defines a set of encryption algorithms, and the data formats for the zip archive that support them, and PKWare supports those algorithms in the tools it produces. Other vendors of tools and libraries, such as WinZip or Xceed, typically support a subset of the algorithms specified by PKWare. These tools can sometimes support additional different encryption algorithms and data formats, not specified by PKWare. The AES Encryption specified and supported by WinZip is the most popular example. This library supports a subset of the complete set of algorithms specified by PKWare and other vendors. There is no common, ubiquitous multi-vendor standard for strong encryption within zip files. There is broad support for so-called "traditional" Zip encryption, sometimes called Zip 2.0 encryption, as specified by PKWare, but this encryption is considered weak and breakable. This library currently supports the Zip 2.0 "weak" encryption, and also a stronger WinZip-compatible AES encryption, using either 128-bit or 256-bit key strength. If you want DotNetZip to support an algorithm that is not currently supported, call the author of this library and maybe we can talk business. The class also has a property. In most cases you will use that property when setting encryption. This property takes precedence over any Encryption set on the ZipFile itself. Typically, you would use the per-entry Encryption when most entries in the zip archive use one encryption algorithm, and a few entries use a different one. If all entries in the zip file use the same Encryption, then it is simpler to just set this property on the ZipFile itself, when creating a zip archive. Some comments on updating archives: If you read a ZipFile, you can modify the Encryption on an encrypted entry: you can remove encryption from an entry that was encrypted; you can encrypt an entry that was not encrypted previously; or, you can change the encryption algorithm. The changes in encryption are not made permanent until you call Save() on the ZipFile. To effect changes in encryption, the entry content is streamed through several transformations, depending on the modification the application has requested. For example if the entry is not encrypted and the application sets Encryption to PkzipWeak, then at the time of Save(), the original entry is read and decompressed, then re-compressed and encrypted. Conversely, if the original entry is encrypted with PkzipWeak encryption, and the application sets the Encryption property to WinZipAes128, then at the time of Save(), the original entry is decrypted via PKZIP encryption and decompressed, then re-compressed and re-encrypted with AES. This all happens automatically within the library, but it can be time-consuming for large entries. Additionally, when updating archives, it is not possible to change the password when changing the encryption algorithm. To change both the algorithm and the password, you need to Save() the zipfile twice. First set the Encryption to None, then call Save(). Then set the Encryption to the new value (not "None"), then call Save() once again. The WinZip AES encryption algorithms are not supported on the .NET Compact Framework. This example creates a zip archive that uses encryption, and then extracts entries from the archive. When creating the zip archive, the ReadMe.txt file is zipped without using a password or encryption. The other file uses encryption. // Create a zip archive with AES Encryption. using (ZipFile zip = new ZipFile()) { zip.AddFile("ReadMe.txt") ZipEntry e1= zip.AddFile("2008-Regional-Sales-Report.pdf"); e1.Encryption= EncryptionAlgorithm.WinZipAes256; e1.Password= "Top.Secret.No.Peeking!"; zip.Save("EncryptedArchive.zip"); } // Extract a zip archive that uses AES Encryption. // You do not need to specify the algorithm during extraction. using (ZipFile zip = ZipFile.Read("EncryptedArchive.zip")) { // Specify the password that is used during extraction, for // all entries that require a password: zip.Password= "Top.Secret.No.Peeking!"; zip.ExtractAll("extractDirectory"); } ' Create a zip that uses Encryption. Using zip As New ZipFile() zip.AddFile("ReadMe.txt") Dim e1 as ZipEntry e1= zip.AddFile("2008-Regional-Sales-Report.pdf") e1.Encryption= EncryptionAlgorithm.WinZipAes256 e1.Password= "Top.Secret.No.Peeking!" zip.Save("EncryptedArchive.zip") End Using ' Extract a zip archive that uses AES Encryption. ' You do not need to specify the algorithm during extraction. Using (zip as ZipFile = ZipFile.Read("EncryptedArchive.zip")) ' Specify the password that is used during extraction, for ' all entries that require a password: zip.Password= "Top.Secret.No.Peeking!" zip.ExtractAll("extractDirectory") End Using Thrown in the setter if EncryptionAlgorithm.Unsupported is specified. ZipEntry.Password ZipFile.Encryption The Password to be used when encrypting a ZipEntry upon ZipFile.Save(), or when decrypting an entry upon Extract(). This is a write-only property on the entry. Set this to request that the entry be encrypted when writing the zip archive, or set it to specify the password to be used when extracting an existing entry that is encrypted. The password set here is implicitly used to encrypt the entry during the operation, or to decrypt during the or operation. If you set the Password on a ZipEntry after calling Save(), there is no effect. Consider setting the property when using a password. Answering concerns that the standard password protection supported by all zip tools is weak, WinZip has extended the ZIP specification with a way to use AES Encryption to protect entries in the Zip file. Unlike the "PKZIP 2.0" encryption specified in the PKZIP specification, AES Encryption uses a standard, strong, tested, encryption algorithm. DotNetZip can create zip archives that use WinZip-compatible AES encryption, if you set the property. But, archives created that use AES encryption may not be readable by all other tools and libraries. For example, Windows Explorer cannot read a "compressed folder" (a zip file) that uses AES encryption, though it can read a zip file that uses "PKZIP encryption." The class also has a property. This property takes precedence over any password set on the ZipFile itself. Typically, you would use the per-entry Password when most entries in the zip archive use one password, and a few entries use a different password. If all entries in the zip file use the same password, then it is simpler to just set this property on the ZipFile itself, whether creating a zip archive or extracting a zip archive. Some comments on updating archives: If you read a ZipFile, you cannot modify the password on any encrypted entry, except by extracting the entry with the original password (if any), removing the original entry via , and then adding a new entry with a new Password. For example, suppose you read a ZipFile, and there is an encrypted entry. Setting the Password property on that ZipEntry and then calling Save() on the ZipFile does not update the password on that entry in the archive. Neither is an exception thrown. Instead, what happens during the Save() is the existing entry is copied through to the new zip archive, in its original encrypted form. Upon re-reading that archive, the entry can be decrypted with its original password. If you read a ZipFile, and there is an un-encrypted entry, you can set the Password on the entry and then call Save() on the ZipFile, and get encryption on that entry. This example creates a zip file with two entries, and then extracts the entries from the zip file. When creating the zip file, the two files are added to the zip file using password protection. Each entry uses a different password. During extraction, each file is extracted with the appropriate password. // create a file with encryption using (ZipFile zip = new ZipFile()) { ZipEntry entry; entry= zip.AddFile("Declaration.txt"); entry.Password= "123456!"; entry = zip.AddFile("Report.xls"); entry.Password= "1Secret!"; zip.Save("EncryptedArchive.zip"); } // extract entries that use encryption using (ZipFile zip = ZipFile.Read("EncryptedArchive.zip")) { ZipEntry entry; entry = zip["Declaration.txt"]; entry.Password = "123456!"; entry.Extract("extractDir"); entry = zip["Report.xls"]; entry.Password = "1Secret!"; entry.Extract("extractDir"); } Using zip As New ZipFile Dim entry as ZipEntry entry= zip.AddFile("Declaration.txt") entry.Password= "123456!" entry = zip.AddFile("Report.xls") entry.Password= "1Secret!" zip.Save("EncryptedArchive.zip") End Using ' extract entries that use encryption Using (zip as ZipFile = ZipFile.Read("EncryptedArchive.zip")) Dim entry as ZipEntry entry = zip("Declaration.txt") entry.Password = "123456!" entry.Extract("extractDir") entry = zip("Report.xls") entry.Password = "1Secret!" entry.Extract("extractDir") End Using ZipFile.Password The action the library should take when extracting a file that already exists. This property affects the behavior of the Extract methods (one of the Extract() or ExtractWithPassword() overloads), when extraction would would overwrite an existing filesystem file. If you do not set this property, the library throws an exception when extracting an entry would overwrite an existing file. This property has no effect when extracting to a stream, or when the file to be extracted does not already exist. This example shows how to set the ExtractExistingFile property in an ExtractProgress event, in response to user input. The ExtractProgress event is invoked if and only if the ExtractExistingFile property was previously set to ExtractExistingFileAction.InvokeExtractProgressEvent. public static void ExtractProgress(object sender, ExtractProgressEventArgs e) { if (e.EventType == ZipProgressEventType.Extracting_BeforeExtractEntry) Console.WriteLine("extract {0} ", e.CurrentEntry.FileName); else if (e.EventType == ZipProgressEventType.Extracting_ExtractEntryWouldOverwrite) { ZipEntry entry = e.CurrentEntry; string response = null; // Ask the user if he wants overwrite the file do { Console.Write("Overwrite {0} in {1} ? (y/n/C) ", entry.FileName, e.ExtractLocation); response = Console.ReadLine(); Console.WriteLine(); } while (response != null && response[0]!='Y' && response[0]!='N' && response[0]!='C'); if (response[0]=='C') e.Cancel = true; else if (response[0]=='Y') entry.ExtractExistingFile = ExtractExistingFileAction.OverwriteSilently; else entry.ExtractExistingFile= ExtractExistingFileAction.DoNotOverwrite; } } The action to take when an error is encountered while opening or reading files as they are saved into a zip archive. Errors can occur within a call to ZipFile.Save, as the various files contained in a ZipFile are being saved into the zip archive. During the Save, DotNetZip will perform a File.Open on the file associated to the ZipEntry, and then will read the entire contents of the file as it is zipped. Either the open or the Read may fail, because of lock conflicts or other reasons. Using this property, you can specify the action to take when such errors occur. Typically you will NOT set this property on individual ZipEntry instances. Instead, you will set the ZipFile.ZipErrorAction property on the ZipFile instance, before adding any entries to the ZipFile. If you do this, errors encountered on behalf of any of the entries in the ZipFile will be handled the same way. But, if you use a handler, you will want to set this property on the ZipEntry within the handler, to communicate back to DotNetZip what you would like to do with the particular error. Indicates whether the entry was included in the most recent save. An entry can be excluded or skipped from a save if there is an error opening or reading the entry. A callback that allows the application to specify the compression to use for a given entry that is about to be added to the zip archive. See Set to indicate whether to use UTF-8 encoding for filenames and comments. If this flag is set, the comment and filename for the entry will be encoded with UTF-8, as described in the Zip specification, if necessary. "Necessary" means, the filename or entry comment (if any) cannot be reflexively encoded and decoded using the default code page, IBM437. Setting this flag to true is equivalent to setting to System.Text.Encoding.UTF8. This flag has no effect or relation to the text encoding used within the file itself. The text encoding to use for the FileName and Comment on this ZipEntry, when the default encoding is insufficient. Don't use this property. See . Specifies the alternate text encoding used by this ZipEntry The default text encoding used in Zip files for encoding filenames and comments is IBM437, which is something like a superset of ASCII. In cases where this is insufficient, applications can specify an alternate encoding. When creating a zip file, the usage of the alternate encoding is governed by the property. Typically you would set both properties to tell DotNetZip to employ an encoding that is not IBM437 in the zipfile you are creating. Keep in mind that because the ZIP specification states that the only valid encodings to use are IBM437 and UTF-8, if you use something other than that, then zip tools and libraries may not be able to successfully read the zip archive you generate. The zip specification states that applications should presume that IBM437 is in use, except when a special bit is set, which indicates UTF-8. There is no way to specify an arbitrary code page, within the zip file itself. When you create a zip file encoded with gb2312 or ibm861 or anything other than IBM437 or UTF-8, then the application that reads the zip file needs to "know" which code page to use. In some cases, the code page used when reading is chosen implicitly. For example, WinRar uses the ambient code page for the host desktop operating system. The pitfall here is that if you create a zip in Copenhagen and send it to Tokyo, the reader of the zipfile may not be able to decode successfully. This example shows how to create a zipfile encoded with a language-specific encoding: using (var zip = new ZipFile()) { zip.AlternateEnoding = System.Text.Encoding.GetEncoding("ibm861"); zip.AlternateEnodingUsage = ZipOption.Always; zip.AddFileS(arrayOfFiles); zip.Save("Myarchive-Encoded-in-IBM861.zip"); } Describes if and when this instance should apply AlternateEncoding to encode the FileName and Comment, when saving. Indicates whether an entry is marked as a text file. Be careful when using on this property. Unless you have a good reason, you should probably ignore this property. The ZIP format includes a provision for specifying whether an entry in the zip archive is a text or binary file. This property exposes that metadata item. Be careful when using this property: It's not clear that this property as a firm meaning, across tools and libraries. To be clear, when reading a zip file, the property value may or may not be set, and its value may or may not be valid. Not all entries that you may think of as "text" entries will be so marked, and entries marked as "text" are not guaranteed in any way to be text entries. Whether the value is set and set correctly depends entirely on the application that produced the zip file. There are many zip tools available, and when creating zip files, some of them "respect" the IsText metadata field, and some of them do not. Unfortunately, even when an application tries to do "the right thing", it's not always clear what "the right thing" is. There's no firm definition of just what it means to be "a text file", and the zip specification does not help in this regard. Twenty years ago, text was ASCII, each byte was less than 127. IsText meant, all bytes in the file were less than 127. These days, it is not the case that all text files have all bytes less than 127. Any unicode file may have bytes that are above 0x7f. The zip specification has nothing to say on this topic. Therefore, it's not clear what IsText really means. This property merely tells a reading application what is stored in the metadata for an entry, without guaranteeing its validity or its meaning. When DotNetZip is used to create a zipfile, it attempts to set this field "correctly." For example, if a file ends in ".txt", this field will be set. Your application may override that default setting. When writing a zip file, you must set the property before calling Save() on the ZipFile. When reading a zip file, a more general way to decide just what kind of file is contained in a particular entry is to use the file type database stored in the operating system. The operating system stores a table that says, a file with .jpg extension is a JPG image file, a file with a .xml extension is an XML document, a file with a .txt is a pure ASCII text document, and so on. To get this information on Windows, you need to read and parse the registry. using (var zip = new ZipFile()) { var e = zip.UpdateFile("Descriptions.mme", ""); e.IsText = true; zip.Save(zipPath); } Using zip As New ZipFile Dim e2 as ZipEntry = zip.AddFile("Descriptions.mme", "") e.IsText= True zip.Save(zipPath) End Using Provides a string representation of the instance. a string representation of the instance. Extract the entry to the filesystem, starting at the current working directory. This method has a bunch of overloads! One of them is sure to be the right one for you... If you don't like these, check out the ExtractWithPassword() methods. This method extracts an entry from a zip file into the current working directory. The path of the entry as extracted is the full path as specified in the zip archive, relative to the current working directory. After the file is extracted successfully, the file attributes and timestamps are set. The action taken when extraction an entry would overwrite an existing file is determined by the property. Within the call to Extract(), the content for the entry is written into a filesystem file, and then the last modified time of the file is set according to the property on the entry. See the remarks the property for some details about the last modified time. Extract the entry to a file in the filesystem, using the specified behavior when extraction would overwrite an existing file. See the remarks on the property, for some details about how the last modified time of the file is set after extraction. The action to take if extraction would overwrite an existing file. Extracts the entry to the specified stream. The caller can specify any write-able stream, for example a , a , or ASP.NET's Response.OutputStream. The content will be decrypted and decompressed as necessary. If the entry is encrypted and no password is provided, this method will throw. The position on the stream is not reset by this method before it extracts. You may want to call stream.Seek() before calling ZipEntry.Extract(). the stream to which the entry should be extracted. Extract the entry to the filesystem, starting at the specified base directory. the pathname of the base directory This example extracts only the entries in a zip file that are .txt files, into a directory called "textfiles". using (ZipFile zip = ZipFile.Read("PackedDocuments.zip")) { foreach (string s1 in zip.EntryFilenames) { if (s1.EndsWith(".txt")) { zip[s1].Extract("textfiles"); } } } Using zip As ZipFile = ZipFile.Read("PackedDocuments.zip") Dim s1 As String For Each s1 In zip.EntryFilenames If s1.EndsWith(".txt") Then zip(s1).Extract("textfiles") End If Next End Using Using this method, existing entries in the filesystem will not be overwritten. If you would like to force the overwrite of existing files, see the property, or call . See the remarks on the property, for some details about how the last modified time of the created file is set. Extract the entry to the filesystem, starting at the specified base directory, and using the specified behavior when extraction would overwrite an existing file. See the remarks on the property, for some details about how the last modified time of the created file is set. String sZipPath = "Airborne.zip"; String sFilePath = "Readme.txt"; String sRootFolder = "Digado"; using (ZipFile zip = ZipFile.Read(sZipPath)) { if (zip.EntryFileNames.Contains(sFilePath)) { // use the string indexer on the zip file zip[sFileName].Extract(sRootFolder, ExtractExistingFileAction.OverwriteSilently); } } Dim sZipPath as String = "Airborne.zip" Dim sFilePath As String = "Readme.txt" Dim sRootFolder As String = "Digado" Using zip As ZipFile = ZipFile.Read(sZipPath) If zip.EntryFileNames.Contains(sFilePath) ' use the string indexer on the zip file zip(sFilePath).Extract(sRootFolder, _ ExtractExistingFileAction.OverwriteSilently) End If End Using the pathname of the base directory The action to take if extraction would overwrite an existing file. Extract the entry to the filesystem, using the current working directory and the specified password. This method has a bunch of overloads! One of them is sure to be the right one for you... Existing entries in the filesystem will not be overwritten. If you would like to force the overwrite of existing files, see the property, or call . See the remarks on the property for some details about how the "last modified" time of the created file is set. In this example, entries that use encryption are extracted using a particular password. using (var zip = ZipFile.Read(FilePath)) { foreach (ZipEntry e in zip) { if (e.UsesEncryption) e.ExtractWithPassword("Secret!"); else e.Extract(); } } Using zip As ZipFile = ZipFile.Read(FilePath) Dim e As ZipEntry For Each e In zip If (e.UsesEncryption) e.ExtractWithPassword("Secret!") Else e.Extract End If Next End Using The Password to use for decrypting the entry. Extract the entry to the filesystem, starting at the specified base directory, and using the specified password. Existing entries in the filesystem will not be overwritten. If you would like to force the overwrite of existing files, see the property, or call . See the remarks on the property, for some details about how the last modified time of the created file is set. The pathname of the base directory. The Password to use for decrypting the entry. Extract the entry to a file in the filesystem, relative to the current directory, using the specified behavior when extraction would overwrite an existing file. See the remarks on the property, for some details about how the last modified time of the created file is set. The Password to use for decrypting the entry. The action to take if extraction would overwrite an existing file. Extract the entry to the filesystem, starting at the specified base directory, and using the specified behavior when extraction would overwrite an existing file. See the remarks on the property, for some details about how the last modified time of the created file is set. the pathname of the base directory The action to take if extraction would overwrite an existing file. The Password to use for decrypting the entry. Extracts the entry to the specified stream, using the specified Password. For example, the caller could extract to Console.Out, or to a MemoryStream. The caller can specify any write-able stream, for example a , a , or ASP.NET's Response.OutputStream. The content will be decrypted and decompressed as necessary. If the entry is encrypted and no password is provided, this method will throw. The position on the stream is not reset by this method before it extracts. You may want to call stream.Seek() before calling ZipEntry.Extract(). the stream to which the entry should be extracted. The password to use for decrypting the entry. Opens a readable stream corresponding to the zip entry in the archive. The stream decompresses and decrypts as necessary, as it is read. DotNetZip offers a variety of ways to extract entries from a zip file. This method allows an application to extract an entry by reading a . The return value is of type . Use it as you would any stream for reading. When an application calls on that stream, it will receive data from the zip entry that is decrypted and decompressed as necessary. CrcCalculatorStream adds one additional feature: it keeps a CRC32 checksum on the bytes of the stream as it is read. The CRC value is available in the property on the CrcCalculatorStream. When the read is complete, your application should check this CRC against the property on the ZipEntry to validate the content of the ZipEntry. You don't have to validate the entry using the CRC, but you should, to verify integrity. Check the example for how to do this. If the entry is protected with a password, then you need to provide a password prior to calling , either by setting the property on the entry, or the property on the ZipFile itself. Or, you can use , the overload of OpenReader that accepts a password parameter. If you want to extract entry data into a write-able stream that is already opened, like a , do not use this method. Instead, use . Your application may use only one stream created by OpenReader() at a time, and you should not call other Extract methods before completing your reads on a stream obtained from OpenReader(). This is because there is really only one source stream for the compressed content. A call to OpenReader() seeks in the source stream, to the beginning of the compressed content. A subsequent call to OpenReader() on a different entry will seek to a different position in the source stream, as will a call to Extract() or one of its overloads. This will corrupt the state for the decompressing stream from the original call to OpenReader(). The OpenReader() method works only when the ZipEntry is obtained from an instance of ZipFile. This method will throw an exception if the ZipEntry is obtained from a ZipInputStream. This example shows how to open a zip archive, then read in a named entry via a stream. After the read loop is complete, the code compares the calculated during the read loop with the expected CRC on the ZipEntry, to verify the extraction. using (ZipFile zip = new ZipFile(ZipFileToRead)) { ZipEntry e1= zip["Elevation.mp3"]; using (Ionic.Zlib.CrcCalculatorStream s = e1.OpenReader()) { byte[] buffer = new byte[4096]; int n, totalBytesRead= 0; do { n = s.Read(buffer,0, buffer.Length); totalBytesRead+=n; } while (n>0); if (s.Crc32 != e1.Crc32) throw new Exception(string.Format("The Zip Entry failed the CRC Check. (0x{0:X8}!=0x{1:X8})", s.Crc32, e1.Crc32)); if (totalBytesRead != e1.UncompressedSize) throw new Exception(string.Format("We read an unexpected number of bytes. ({0}!={1})", totalBytesRead, e1.UncompressedSize)); } } Using zip As New ZipFile(ZipFileToRead) Dim e1 As ZipEntry = zip.Item("Elevation.mp3") Using s As Ionic.Zlib.CrcCalculatorStream = e1.OpenReader Dim n As Integer Dim buffer As Byte() = New Byte(4096) {} Dim totalBytesRead As Integer = 0 Do n = s.Read(buffer, 0, buffer.Length) totalBytesRead = (totalBytesRead + n) Loop While (n > 0) If (s.Crc32 <> e1.Crc32) Then Throw New Exception(String.Format("The Zip Entry failed the CRC Check. (0x{0:X8}!=0x{1:X8})", s.Crc32, e1.Crc32)) End If If (totalBytesRead <> e1.UncompressedSize) Then Throw New Exception(String.Format("We read an unexpected number of bytes. ({0}!={1})", totalBytesRead, e1.UncompressedSize)) End If End Using End Using The Stream for reading. Opens a readable stream for an encrypted zip entry in the archive. The stream decompresses and decrypts as necessary, as it is read. See the documentation on the method for full details. This overload allows the application to specify a password for the ZipEntry to be read. The password to use for decrypting the entry. The Stream for reading. Validates that the args are consistent. Only one of {baseDir, outStream} can be non-null. If baseDir is non-null, then the outputFile is created. Reads one ZipEntry from the given stream. The content for the entry does not get decompressed or decrypted. This method basically reads metadata, and seeks. the ZipContainer this entry belongs to. true of this is the first entry being read from the stream. the ZipEntry read from the stream. Finds a particular segment in the given extra field. This is used when modifying a previously-generated extra field, in particular when removing the AES crypto segment in the extra field. At current cursor position in the stream, read the extra field, and set the properties on the ZipEntry instance appropriately. This can be called when processing the Extra field in the Central Directory, or in the local header. generate and return a byte array that encodes the filename for the entry. side effects: generate and store into _CommentBytes the byte array for any comment attached to the entry. Also sets _actualEncoding to indicate the actual encoding used. The same encoding is used for both filename and comment. Stores the position of the entry source stream, or, if the position is already stored, seeks to that position. This method is called in prep for reading the source stream. If PKZIP encryption is used, then we need to calc the CRC32 before doing the encryption, because the CRC is used in the 12th byte of the PKZIP encryption header. So, we need to be able to seek backward in the source when saving the ZipEntry. This method is called from the place that calculates the CRC, and also from the method that does the encryption of the file data. The first time through, this method sets the _sourceStreamOriginalPosition field. Subsequent calls to this method seek to that position. Copy metadata that may have been changed by the app. We do this when resetting the zipFile instance. If the app calls Save() on a ZipFile, then tries to party on that file some more, we may need to Reset() it , which means re-reading the entries and then copying the metadata. I think. Set the input stream and get its length, if possible. The length is used for progress updates, AND, to allow an optimization in case of a stream/file of zero length. In that case we skip the Encrypt and compression Stream. (like DeflateStream or BZip2OutputStream) Prepare the given stream for output - wrap it in a CountingStream, and then in a CRC stream, and an encryptor and deflator as appropriate. Previously this was used in ZipEntry.Write(), but in an effort to introduce some efficiencies in that method I've refactored to put the code inline. This method still gets called by ZipOutputStream. An enum that specifies the type of timestamp available on the ZipEntry. The last modified time of a file can be stored in multiple ways in a zip file, and they are not mutually exclusive: In the so-called "DOS" format, which has a 2-second precision. Values are rounded to the nearest even second. For example, if the time on the file is 12:34:43, then it will be stored as 12:34:44. This first value is accessible via the LastModified property. This value is always present in the metadata for each zip entry. In some cases the value is invalid, or zero. In the so-called "Windows" or "NTFS" format, as an 8-byte integer quantity expressed as the number of 1/10 milliseconds (in other words the number of 100 nanosecond units) since January 1, 1601 (UTC). This format is how Windows represents file times. This time is accessible via the ModifiedTime property. In the "Unix" format, a 4-byte quantity specifying the number of seconds since January 1, 1970 UTC. In an older format, now deprecated but still used by some current tools. This format is also a 4-byte quantity specifying the number of seconds since January 1, 1970 UTC. This bit field describes which of the formats were found in a ZipEntry that was read. Default value. A DOS timestamp with 2-second precision. A Windows timestamp with 100-ns precision. A Unix timestamp with 1-second precision. A Unix timestamp with 1-second precision, stored in InfoZip v1 format. This format is outdated and is supported for reading archives only. The method of compression to use for a particular ZipEntry. PKWare's ZIP Specification describes a number of distinct cmopression methods that can be used within a zip file. DotNetZip supports a subset of them. No compression at all. For COM environments, the value is 0 (zero). DEFLATE compression, as described in IETF RFC 1951. This is the "normal" compression used in zip files. For COM environments, the value is 8. An enum that specifies the source of the ZipEntry. Default value. Invalid on a bonafide ZipEntry. The entry was instantiated by calling AddFile() or another method that added an entry from the filesystem. The entry was instantiated via or . The ZipEntry was instantiated by reading a zipfile. The content for the ZipEntry will be or was provided by the WriteDelegate. The content for the ZipEntry will be obtained from the stream dispensed by the OpenDelegate. The entry was instantiated via . The content for the ZipEntry will be or was obtained from a ZipOutputStream. An enum providing the options when an error occurs during opening or reading of a file or directory that is being saved to a zip file. This enum describes the actions that the library can take when an error occurs opening or reading a file, as it is being saved into a Zip archive. In some cases an error will occur when DotNetZip tries to open a file to be added to the zip archive. In other cases, an error might occur after the file has been successfully opened, while DotNetZip is reading the file. The first problem might occur when calling AddDirectory() on a directory that contains a Clipper .dbf file; the file is locked by Clipper and cannot be opened by another process. An example of the second problem is the ERROR_LOCK_VIOLATION that results when a file is opened by another process, but not locked, and a range lock has been taken on the file. Microsoft Outlook takes range locks on .PST files. Throw an exception when an error occurs while zipping. This is the default behavior. (For COM clients, this is a 0 (zero).) When an error occurs during zipping, for example a file cannot be opened, skip the file causing the error, and continue zipping. (For COM clients, this is a 1.) When an error occurs during zipping, for example a file cannot be opened, retry the operation that caused the error. Be careful with this option. If the error is not temporary, the library will retry forever. (For COM clients, this is a 2.) When an error occurs, invoke the zipError event. The event type used is . A typical use of this option: a GUI application may wish to pop up a dialog to allow the user to view the error that occurred, and choose an appropriate action. After your processing in the error event, if you want to skip the file, set on the ZipProgressEventArgs.CurrentEntry to Skip. If you want the exception to be thrown, set ZipErrorAction on the CurrentEntry to Throw. If you want to cancel the zip, set ZipProgressEventArgs.Cancel to true. Cancelling differs from using Skip in that a cancel will not save any further entries, if there are any. (For COM clients, the value of this enum is a 3.) The ZipFile type represents a zip archive file. This is the main type in the DotNetZip class library. This class reads and writes zip files, as defined in the specification for zip files described by PKWare. The compression for this implementation is provided by a managed-code version of Zlib, included with DotNetZip in the classes in the Ionic.Zlib namespace. This class provides a general purpose zip file capability. Use it to read, create, or update zip files. When you want to create zip files using a Stream type to write the zip file, you may want to consider the class. Both the ZipOutputStream class and the ZipFile class can be used to create zip files. Both of them support many of the common zip features, including Unicode, different compression methods and levels, and ZIP64. They provide very similar performance when creating zip files. The ZipFile class is generally easier to use than ZipOutputStream and should be considered a higher-level interface. For example, when creating a zip file via calls to the PutNextEntry() and Write() methods on the ZipOutputStream class, the caller is responsible for opening the file, reading the bytes from the file, writing those bytes into the ZipOutputStream, setting the attributes on the ZipEntry, and setting the created, last modified, and last accessed timestamps on the zip entry. All of these things are done automatically by a call to ZipFile.AddFile(). For this reason, the ZipOutputStream is generally recommended for use only when your application emits arbitrary data, not necessarily data from a filesystem file, directly into a zip file, and does so using a Stream metaphor. Aside from the differences in programming model, there are other differences in capability between the two classes. ZipFile can be used to read and extract zip files, in addition to creating zip files. ZipOutputStream cannot read zip files. If you want to use a stream to read zip files, check out the ZipInputStream class. ZipOutputStream does not support the creation of segmented or spanned zip files. ZipOutputStream cannot produce a self-extracting archive. Be aware that the ZipFile class implements the interface. In order for ZipFile to produce a valid zip file, you use use it within a using clause (Using in VB), or call the Dispose() method explicitly. See the examples for how to employ a using clause. Adds an item, either a file or a directory, to a zip file archive. This method is handy if you are adding things to zip archive and don't want to bother distinguishing between directories or files. Any files are added as single entries. A directory added through this method is added recursively: all files and subdirectories contained within the directory are added to the ZipFile. The name of the item may be a relative path or a fully-qualified path. Remember, the items contained in ZipFile instance get written to the disk only when you call or a similar save method. The directory name used for the file within the archive is the same as the directory name (potentially a relative path) specified in the . For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. This method has two overloads. the name of the file or directory to add. The ZipEntry added. Adds an item, either a file or a directory, to a zip file archive, explicitly specifying the directory path to be used in the archive. If adding a directory, the add is recursive on all files and subdirectories contained within it. The name of the item may be a relative path or a fully-qualified path. The item added by this call to the ZipFile is not read from the disk nor written to the zip file archive until the application calls Save() on the ZipFile. This version of the method allows the caller to explicitly specify the directory path to be used in the archive, which would override the "natural" path of the filesystem file. Encryption will be used on the file data if the Password has been set on the ZipFile object, prior to calling this method. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. Thrown if the file or directory passed in does not exist. the name of the file or directory to add. The name of the directory path to use within the zip archive. This path need not refer to an extant directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (Nothing in VB) will use the path on the fileOrDirectoryName. Passing the empty string ("") will insert the item at the root path within the archive. This example shows how to zip up a set of files into a flat hierarchy, regardless of where in the filesystem the files originated. The resulting zip archive will contain a toplevel directory named "flat", which itself will contain files Readme.txt, MyProposal.docx, and Image1.jpg. A subdirectory under "flat" called SupportFiles will contain all the files in the "c:\SupportFiles" directory on disk. String[] itemnames= { "c:\\fixedContent\\Readme.txt", "MyProposal.docx", "c:\\SupportFiles", // a directory "images\\Image1.jpg" }; try { using (ZipFile zip = new ZipFile()) { for (int i = 1; i < itemnames.Length; i++) { // will add Files or Dirs, recurses and flattens subdirectories zip.AddItem(itemnames[i],"flat"); } zip.Save(ZipToCreate); } } catch (System.Exception ex1) { System.Console.Error.WriteLine("exception: {0}", ex1); } Dim itemnames As String() = _ New String() { "c:\fixedContent\Readme.txt", _ "MyProposal.docx", _ "SupportFiles", _ "images\Image1.jpg" } Try Using zip As New ZipFile Dim i As Integer For i = 1 To itemnames.Length - 1 ' will add Files or Dirs, recursing and flattening subdirectories. zip.AddItem(itemnames(i), "flat") Next i zip.Save(ZipToCreate) End Using Catch ex1 As Exception Console.Error.WriteLine("exception: {0}", ex1.ToString()) End Try The ZipEntry added. Adds a File to a Zip file archive. This call collects metadata for the named file in the filesystem, including the file attributes and the timestamp, and inserts that metadata into the resulting ZipEntry. Only when the application calls Save() on the ZipFile, does DotNetZip read the file from the filesystem and then write the content to the zip file archive. This method will throw an exception if an entry with the same name already exists in the ZipFile. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. In this example, three files are added to a Zip archive. The ReadMe.txt file will be placed in the root of the archive. The .png file will be placed in a folder within the zip called photos\personal. The pdf file will be included into a folder within the zip called Desktop. try { using (ZipFile zip = new ZipFile()) { zip.AddFile("c:\\photos\\personal\\7440-N49th.png"); zip.AddFile("c:\\Desktop\\2008-Regional-Sales-Report.pdf"); zip.AddFile("ReadMe.txt"); zip.Save("Package.zip"); } } catch (System.Exception ex1) { System.Console.Error.WriteLine("exception: " + ex1); } Try Using zip As ZipFile = New ZipFile zip.AddFile("c:\photos\personal\7440-N49th.png") zip.AddFile("c:\Desktop\2008-Regional-Sales-Report.pdf") zip.AddFile("ReadMe.txt") zip.Save("Package.zip") End Using Catch ex1 As Exception Console.Error.WriteLine("exception: {0}", ex1.ToString) End Try This method has two overloads. The name of the file to add. It should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. The ZipEntry corresponding to the File added. Adds a File to a Zip file archive, potentially overriding the path to be used within the zip archive. The file added by this call to the ZipFile is not written to the zip file archive until the application calls Save() on the ZipFile. This method will throw an exception if an entry with the same name already exists in the ZipFile. This version of the method allows the caller to explicitly specify the directory path to be used in the archive. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. In this example, three files are added to a Zip archive. The ReadMe.txt file will be placed in the root of the archive. The .png file will be placed in a folder within the zip called images. The pdf file will be included into a folder within the zip called files\docs, and will be encrypted with the given password. try { using (ZipFile zip = new ZipFile()) { // the following entry will be inserted at the root in the archive. zip.AddFile("c:\\datafiles\\ReadMe.txt", ""); // this image file will be inserted into the "images" directory in the archive. zip.AddFile("c:\\photos\\personal\\7440-N49th.png", "images"); // the following will result in a password-protected file called // files\\docs\\2008-Regional-Sales-Report.pdf in the archive. zip.Password = "EncryptMe!"; zip.AddFile("c:\\Desktop\\2008-Regional-Sales-Report.pdf", "files\\docs"); zip.Save("Archive.zip"); } } catch (System.Exception ex1) { System.Console.Error.WriteLine("exception: {0}", ex1); } Try Using zip As ZipFile = New ZipFile ' the following entry will be inserted at the root in the archive. zip.AddFile("c:\datafiles\ReadMe.txt", "") ' this image file will be inserted into the "images" directory in the archive. zip.AddFile("c:\photos\personal\7440-N49th.png", "images") ' the following will result in a password-protected file called ' files\\docs\\2008-Regional-Sales-Report.pdf in the archive. zip.Password = "EncryptMe!" zip.AddFile("c:\Desktop\2008-Regional-Sales-Report.pdf", "files\documents") zip.Save("Archive.zip") End Using Catch ex1 As Exception Console.Error.WriteLine("exception: {0}", ex1) End Try The name of the file to add. The name of the file may be a relative path or a fully-qualified path. Specifies a directory path to use to override any path in the fileName. This path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (Nothing in VB) will use the path on the fileName, if any. Passing the empty string ("") will insert the item at the root path within the archive. The ZipEntry corresponding to the file added. This method removes a collection of entries from the ZipFile. A collection of ZipEntry instances from this zip file to be removed. For example, you can pass in an array of ZipEntry instances; or you can call SelectEntries(), and then add or remove entries from that ICollection<ZipEntry> (ICollection(Of ZipEntry) in VB), and pass that ICollection to this method. This method removes a collection of entries from the ZipFile, by name. A collection of strings that refer to names of entries to be removed from the ZipFile. For example, you can pass in an array or a List of Strings that provide the names of entries to be removed. This method adds a set of files to the ZipFile. Use this method to add a set of files to the zip archive, in one call. For example, a list of files received from System.IO.Directory.GetFiles() can be added to a zip archive in one call. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to each ZipEntry added. The collection of names of the files to add. Each string should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. This example shows how to create a zip file, and add a few files into it. String ZipFileToCreate = "archive1.zip"; String DirectoryToZip = "c:\\reports"; using (ZipFile zip = new ZipFile()) { // Store all files found in the top level directory, into the zip archive. String[] filenames = System.IO.Directory.GetFiles(DirectoryToZip); zip.AddFiles(filenames); zip.Save(ZipFileToCreate); } Dim ZipFileToCreate As String = "archive1.zip" Dim DirectoryToZip As String = "c:\reports" Using zip As ZipFile = New ZipFile ' Store all files found in the top level directory, into the zip archive. Dim filenames As String() = System.IO.Directory.GetFiles(DirectoryToZip) zip.AddFiles(filenames) zip.Save(ZipFileToCreate) End Using Adds or updates a set of files in the ZipFile. Any files that already exist in the archive are updated. Any files that don't yet exist in the archive are added. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to each ZipEntry added. The collection of names of the files to update. Each string should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. Adds a set of files to the ZipFile, using the specified directory path in the archive. Any directory structure that may be present in the filenames contained in the list is "flattened" in the archive. Each file in the list is added to the archive in the specified top-level directory. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to each ZipEntry added. The names of the files to add. Each string should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. Specifies a directory path to use to override any path in the file name. Th is path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (Nothing in VB) will use the path on each of the fileNames, if any. Passing the empty string ("") will insert the item at the root path within the archive. Adds a set of files to the ZipFile, using the specified directory path in the archive, and preserving the full directory structure in the filenames. Think of the as a "root" or base directory used in the archive for the files that get added. when is true, the hierarchy of files found in the filesystem will be placed, with the hierarchy intact, starting at that root in the archive. When preserveDirHierarchy is false, the path hierarchy of files is flattned, and the flattened set of files gets placed in the root within the archive as specified in directoryPathInArchive. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to each ZipEntry added. The names of the files to add. Each string should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. Specifies a directory path to use as a prefix for each entry name. This path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (Nothing in VB) will use the path on each of the fileNames, if any. Passing the empty string ("") will insert the item at the root path within the archive. whether the entries in the zip archive will reflect the directory hierarchy that is present in the various filenames. For example, if includes two paths, \Animalia\Chordata\Mammalia\Info.txt and \Plantae\Magnoliophyta\Dicotyledon\Info.txt, then calling this method with = false will result in an exception because of a duplicate entry name, while calling this method with = true will result in the full direcory paths being included in the entries added to the ZipFile. Adds or updates a set of files to the ZipFile, using the specified directory path in the archive. Any files that already exist in the archive are updated. Any files that don't yet exist in the archive are added. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to each ZipEntry added. The names of the files to add or update. Each string should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. Specifies a directory path to use to override any path in the file name. This path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (Nothing in VB) will use the path on each of the fileNames, if any. Passing the empty string ("") will insert the item at the root path within the archive. Adds or Updates a File in a Zip file archive. This method adds a file to a zip archive, or, if the file already exists in the zip archive, this method Updates the content of that given filename in the zip archive. The UpdateFile method might more accurately be called "AddOrUpdateFile". Upon success, there is no way for the application to learn whether the file was added versus updated. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. This example shows how to Update an existing entry in a zipfile. The first call to UpdateFile adds the file to the newly-created zip archive. The second call to UpdateFile updates the content for that file in the zip archive. using (ZipFile zip1 = new ZipFile()) { // UpdateFile might more accurately be called "AddOrUpdateFile" zip1.UpdateFile("MyDocuments\\Readme.txt"); zip1.UpdateFile("CustomerList.csv"); zip1.Comment = "This zip archive has been created."; zip1.Save("Content.zip"); } using (ZipFile zip2 = ZipFile.Read("Content.zip")) { zip2.UpdateFile("Updates\\Readme.txt"); zip2.Comment = "This zip archive has been updated: The Readme.txt file has been changed."; zip2.Save(); } Using zip1 As New ZipFile ' UpdateFile might more accurately be called "AddOrUpdateFile" zip1.UpdateFile("MyDocuments\Readme.txt") zip1.UpdateFile("CustomerList.csv") zip1.Comment = "This zip archive has been created." zip1.Save("Content.zip") End Using Using zip2 As ZipFile = ZipFile.Read("Content.zip") zip2.UpdateFile("Updates\Readme.txt") zip2.Comment = "This zip archive has been updated: The Readme.txt file has been changed." zip2.Save End Using The name of the file to add or update. It should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. The ZipEntry corresponding to the File that was added or updated. Adds or Updates a File in a Zip file archive. This method adds a file to a zip archive, or, if the file already exists in the zip archive, this method Updates the content of that given filename in the zip archive. This version of the method allows the caller to explicitly specify the directory path to be used in the archive. The entry to be added or updated is found by using the specified directory path, combined with the basename of the specified filename. Upon success, there is no way for the application to learn if the file was added versus updated. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. The name of the file to add or update. It should refer to a file in the filesystem. The name of the file may be a relative path or a fully-qualified path. Specifies a directory path to use to override any path in the fileName. This path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (Nothing in VB) will use the path on the fileName, if any. Passing the empty string ("") will insert the item at the root path within the archive. The ZipEntry corresponding to the File that was added or updated. Add or update a directory in a zip archive. If the specified directory does not exist in the archive, then this method is equivalent to calling AddDirectory(). If the specified directory already exists in the archive, then this method updates any existing entries, and adds any new entries. Any entries that are in the zip archive but not in the specified directory, are left alone. In other words, the contents of the zip file will be a union of the previous contents and the new files. The path to the directory to be added to the zip archive, or updated in the zip archive. The ZipEntry corresponding to the Directory that was added or updated. Add or update a directory in the zip archive at the specified root directory in the archive. If the specified directory does not exist in the archive, then this method is equivalent to calling AddDirectory(). If the specified directory already exists in the archive, then this method updates any existing entries, and adds any new entries. Any entries that are in the zip archive but not in the specified directory, are left alone. In other words, the contents of the zip file will be a union of the previous contents and the new files. The path to the directory to be added to the zip archive, or updated in the zip archive. Specifies a directory path to use to override any path in the directoryName. This path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (Nothing in VB) will use the path on the directoryName, if any. Passing the empty string ("") will insert the item at the root path within the archive. The ZipEntry corresponding to the Directory that was added or updated. Add or update a file or directory in the zip archive. This is useful when the application is not sure or does not care if the item to be added is a file or directory, and does not know or does not care if the item already exists in the ZipFile. Calling this method is equivalent to calling RemoveEntry() if an entry by the same name already exists, followed calling by AddItem(). For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. the path to the file or directory to be added or updated. Add or update a file or directory. This method is useful when the application is not sure or does not care if the item to be added is a file or directory, and does not know or does not care if the item already exists in the ZipFile. Calling this method is equivalent to calling RemoveEntry(), if an entry by that name exists, and then calling AddItem(). This version of the method allows the caller to explicitly specify the directory path to be used for the item being added to the archive. The entry or entries that are added or updated will use the specified DirectoryPathInArchive. Extracting the entry from the archive will result in a file stored in that directory path. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. The path for the File or Directory to be added or updated. Specifies a directory path to use to override any path in the itemName. This path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (Nothing in VB) will use the path on the itemName, if any. Passing the empty string ("") will insert the item at the root path within the archive. Adds a named entry into the zip archive, taking content for the entry from a string. Calling this method creates an entry using the given fileName and directory path within the archive. There is no need for a file by the given name to exist in the filesystem; the name is used within the zip archive only. The content for the entry is encoded using the default text encoding for the machine, or on Silverlight, using UTF-8. The content of the file, should it be extracted from the zip. The name, including any path, to use for the entry within the archive. The ZipEntry added. This example shows how to add an entry to the zipfile, using a string as content for that entry. string Content = "This string will be the content of the Readme.txt file in the zip archive."; using (ZipFile zip1 = new ZipFile()) { zip1.AddFile("MyDocuments\\Resume.doc", "files"); zip1.AddEntry("Readme.txt", Content); zip1.Comment = "This zip file was created at " + System.DateTime.Now.ToString("G"); zip1.Save("Content.zip"); } Public Sub Run() Dim Content As String = "This string will be the content of the Readme.txt file in the zip archive." Using zip1 As ZipFile = New ZipFile zip1.AddEntry("Readme.txt", Content) zip1.AddFile("MyDocuments\Resume.doc", "files") zip1.Comment = ("This zip file was created at " & DateTime.Now.ToString("G")) zip1.Save("Content.zip") End Using End Sub Adds a named entry into the zip archive, taking content for the entry from a string, and using the specified text encoding. Calling this method creates an entry using the given fileName and directory path within the archive. There is no need for a file by the given name to exist in the filesystem; the name is used within the zip archive only. The content for the entry, a string value, is encoded using the given text encoding. A BOM (byte-order-mark) is emitted into the file, if the Encoding parameter is set for that. Most Encoding classes support a constructor that accepts a boolean, indicating whether to emit a BOM or not. For example see . The name, including any path, to use within the archive for the entry. The content of the file, should it be extracted from the zip. The text encoding to use when encoding the string. Be aware: This is distinct from the text encoding used to encode the fileName, as specified in . The ZipEntry added. Create an entry in the ZipFile using the given Stream as input. The entry will have the given filename. The application should provide an open, readable stream; in this case it will be read during the call to or one of its overloads. The passed stream will be read from its current position. If necessary, callers should set the position in the stream before calling AddEntry(). This might be appropriate when using this method with a MemoryStream, for example. In cases where a large number of streams will be added to the ZipFile, the application may wish to avoid maintaining all of the streams open simultaneously. To handle this situation, the application should use the overload. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. This example adds a single entry to a ZipFile via a Stream. String zipToCreate = "Content.zip"; String fileNameInArchive = "Content-From-Stream.bin"; using (System.IO.Stream streamToRead = MyStreamOpener()) { using (ZipFile zip = new ZipFile()) { ZipEntry entry= zip.AddEntry(fileNameInArchive, streamToRead); zip.AddFile("Readme.txt"); zip.Save(zipToCreate); // the stream is read implicitly here } } Dim zipToCreate As String = "Content.zip" Dim fileNameInArchive As String = "Content-From-Stream.bin" Using streamToRead as System.IO.Stream = MyStreamOpener() Using zip As ZipFile = New ZipFile() Dim entry as ZipEntry = zip.AddEntry(fileNameInArchive, streamToRead) zip.AddFile("Readme.txt") zip.Save(zipToCreate) '' the stream is read implicitly, here End Using End Using The name, including any path, which is shown in the zip file for the added entry. The input stream from which to grab content for the file The ZipEntry added. Add a ZipEntry for which content is written directly by the application. When the application needs to write the zip entry data, use this method to add the ZipEntry. For example, in the case that the application wishes to write the XML representation of a DataSet into a ZipEntry, the application can use this method to do so. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. About progress events: When using the WriteDelegate, DotNetZip does not issue any SaveProgress events with EventType = Saving_EntryBytesRead. (This is because it is the application's code that runs in WriteDelegate - there's no way for DotNetZip to know when to issue a EntryBytesRead event.) Applications that want to update a progress bar or similar status indicator should do so from within the WriteDelegate itself. DotNetZip will issue the other SaveProgress events, including Saving_Started, Saving_BeforeWriteEntry, and Saving_AfterWriteEntry. Note: When you use PKZip encryption, it's normally necessary to compute the CRC of the content to be encrypted, before compressing or encrypting it. Therefore, when using PKZip encryption with a WriteDelegate, the WriteDelegate CAN BE called twice: once to compute the CRC, and the second time to potentially compress and encrypt. Surprising, but true. This is because PKWARE specified that the encryption initialization data depends on the CRC. If this happens, for each call of the delegate, your application must stream the same entry data in its entirety. If your application writes different data during the second call, it will result in a corrupt zip file. The double-read behavior happens with all types of entries, not only those that use WriteDelegate. It happens if you add an entry from a filesystem file, or using a string, or a stream, or an opener/closer pair. But in those cases, DotNetZip takes care of reading twice; in the case of the WriteDelegate, the application code gets invoked twice. Be aware. As you can imagine, this can cause performance problems for large streams, and it can lead to correctness problems when you use a WriteDelegate. This is a pretty big pitfall. There are two ways to avoid it. First, and most preferred: don't use PKZIP encryption. If you use the WinZip AES encryption, this problem doesn't occur, because the encryption protocol doesn't require the CRC up front. Second: if you do choose to use PKZIP encryption, write out to a non-seekable stream (like standard output, or the Response.OutputStream in an ASP.NET application). In this case, DotNetZip will use an alternative encryption protocol that does not rely on the CRC of the content. This also implies setting bit 3 in the zip entry, which still presents problems for some zip tools. In the future I may modify DotNetZip to *always* use bit 3 when PKZIP encryption is in use. This seems like a win overall, but there will be some work involved. If you feel strongly about it, visit the DotNetZip forums and vote up the Workitem tracking this issue. the name of the entry to add the delegate which will write the entry content the ZipEntry added This example shows an application filling a DataSet, then saving the contents of that DataSet as XML, into a ZipEntry in a ZipFile, using an anonymous delegate in C#. The DataSet XML is never saved to a disk file. var c1= new System.Data.SqlClient.SqlConnection(connstring1); var da = new System.Data.SqlClient.SqlDataAdapter() { SelectCommand= new System.Data.SqlClient.SqlCommand(strSelect, c1) }; DataSet ds1 = new DataSet(); da.Fill(ds1, "Invoices"); using(Ionic.Zip.ZipFile zip = new Ionic.Zip.ZipFile()) { zip.AddEntry(zipEntryName, (name,stream) => ds1.WriteXml(stream) ); zip.Save(zipFileName); } This example uses an anonymous method in C# as the WriteDelegate to provide the data for the ZipEntry. The example is a bit contrived - the AddFile() method is a simpler way to insert the contents of a file into an entry in a zip file. On the other hand, if there is some sort of processing or transformation of the file contents required before writing, the application could use the WriteDelegate to do it, in this way. using (var input = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite )) { using(Ionic.Zip.ZipFile zip = new Ionic.Zip.ZipFile()) { zip.AddEntry(zipEntryName, (name,output) => { byte[] buffer = new byte[BufferSize]; int n; while ((n = input.Read(buffer, 0, buffer.Length)) != 0) { // could transform the data here... output.Write(buffer, 0, n); // could update a progress bar here } }); zip.Save(zipFileName); } } This example uses a named delegate in VB to write data for the given ZipEntry (VB9 does not have anonymous delegates). The example here is a bit contrived - a simpler way to add the contents of a file to a ZipEntry is to simply use the appropriate AddFile() method. The key scenario for which the WriteDelegate makes sense is saving a DataSet, in XML format, to the zip file. The DataSet can write XML to a stream, and the WriteDelegate is the perfect place to write into the zip file. There may be other data structures that can write to a stream, but cannot be read as a stream. The WriteDelegate would be appropriate for those cases as well. Private Sub WriteEntry (ByVal name As String, ByVal output As Stream) Using input As FileStream = File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite) Dim n As Integer = -1 Dim buffer As Byte() = New Byte(BufferSize){} Do While n <> 0 n = input.Read(buffer, 0, buffer.Length) output.Write(buffer, 0, n) Loop End Using End Sub Public Sub Run() Using zip = New ZipFile zip.AddEntry(zipEntryName, New WriteDelegate(AddressOf WriteEntry)) zip.Save(zipFileName) End Using End Sub Add an entry, for which the application will provide a stream containing the entry data, on a just-in-time basis. In cases where the application wishes to open the stream that holds the content for the ZipEntry, on a just-in-time basis, the application can use this method. The application provides an opener delegate that will be called by the DotNetZip library to obtain a readable stream that can be read to get the bytes for the given entry. Typically, this delegate opens a stream. Optionally, the application can provide a closer delegate as well, which will be called by DotNetZip when all bytes have been read from the entry. These delegates are called from within the scope of the call to ZipFile.Save(). For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. This example uses anonymous methods in C# to open and close the source stream for the content for a zip entry. using(Ionic.Zip.ZipFile zip = new Ionic.Zip.ZipFile()) { zip.AddEntry(zipEntryName, (name) => File.Open(filename, FileMode.Open, FileAccess.Read, FileShare.ReadWrite ), (name, stream) => stream.Close() ); zip.Save(zipFileName); } This example uses delegates in VB.NET to open and close the the source stream for the content for a zip entry. VB 9.0 lacks support for "Sub" lambda expressions, and so the CloseDelegate must be an actual, named Sub. Function MyStreamOpener(ByVal entryName As String) As Stream '' This simply opens a file. You probably want to do somethinig '' more involved here: open a stream to read from a database, '' open a stream on an HTTP connection, and so on. Return File.OpenRead(entryName) End Function Sub MyStreamCloser(entryName As String, stream As Stream) stream.Close() End Sub Public Sub Run() Dim dirToZip As String = "fodder" Dim zipFileToCreate As String = "Archive.zip" Dim opener As OpenDelegate = AddressOf MyStreamOpener Dim closer As CloseDelegate = AddressOf MyStreamCloser Dim numFilestoAdd As Int32 = 4 Using zip As ZipFile = New ZipFile Dim i As Integer For i = 0 To numFilesToAdd - 1 zip.AddEntry(String.Format("content-{0:000}.txt"), opener, closer) Next i zip.Save(zipFileToCreate) End Using End Sub the name of the entry to add the delegate that will be invoked by ZipFile.Save() to get the readable stream for the given entry. ZipFile.Save() will call read on this stream to obtain the data for the entry. This data will then be compressed and written to the newly created zip file. the delegate that will be invoked to close the stream. This may be null (Nothing in VB), in which case no call is makde to close the stream. the ZipEntry added Updates the given entry in the ZipFile, using the given string as content for the ZipEntry. Calling this method is equivalent to removing the ZipEntry for the given file name and directory path, if it exists, and then calling . See the documentation for that method for further explanation. The string content is encoded using the default encoding for the machine, or on Silverlight, using UTF-8. This encoding is distinct from the encoding used for the filename itself. See . The name, including any path, to use within the archive for the entry. The content of the file, should it be extracted from the zip. The ZipEntry added. Updates the given entry in the ZipFile, using the given string as content for the ZipEntry. Calling this method is equivalent to removing the ZipEntry for the given file name and directory path, if it exists, and then calling . See the documentation for that method for further explanation. The name, including any path, to use within the archive for the entry. The content of the file, should it be extracted from the zip. The text encoding to use when encoding the string. Be aware: This is distinct from the text encoding used to encode the filename. See . The ZipEntry added. Updates the given entry in the ZipFile, using the given delegate as the source for content for the ZipEntry. Calling this method is equivalent to removing the ZipEntry for the given file name and directory path, if it exists, and then calling . See the documentation for that method for further explanation. The name, including any path, to use within the archive for the entry. the delegate which will write the entry content. The ZipEntry added. Updates the given entry in the ZipFile, using the given delegates to open and close the stream that provides the content for the ZipEntry. Calling this method is equivalent to removing the ZipEntry for the given file name and directory path, if it exists, and then calling . See the documentation for that method for further explanation. The name, including any path, to use within the archive for the entry. the delegate that will be invoked to open the stream the delegate that will be invoked to close the stream The ZipEntry added or updated. Updates the given entry in the ZipFile, using the given stream as input, and the given filename and given directory Path. Calling the method is equivalent to calling RemoveEntry() if an entry by the same name already exists, and then calling AddEntry() with the given fileName and stream. The stream must be open and readable during the call to ZipFile.Save. You can dispense the stream on a just-in-time basis using the property. Check the documentation of that property for more information. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to the ZipEntry added. The name, including any path, to use within the archive for the entry. The input stream from which to read file data. The ZipEntry added. Add an entry into the zip archive using the given filename and directory path within the archive, and the given content for the file. No file is created in the filesystem. The data to use for the entry. The name, including any path, to use within the archive for the entry. The ZipEntry added. Updates the given entry in the ZipFile, using the given byte array as content for the entry. Calling this method is equivalent to removing the ZipEntry for the given filename and directory path, if it exists, and then calling . See the documentation for that method for further explanation. The name, including any path, to use within the archive for the entry. The content to use for the ZipEntry. The ZipEntry added. Adds the contents of a filesystem directory to a Zip file archive. The name of the directory may be a relative path or a fully-qualified path. Any files within the named directory are added to the archive. Any subdirectories within the named directory are also added to the archive, recursively. Top-level entries in the named directory will appear as top-level entries in the zip archive. Entries in subdirectories in the named directory will result in entries in subdirectories in the zip archive. If you want the entries to appear in a containing directory in the zip archive itself, then you should call the AddDirectory() overload that allows you to explicitly specify a directory path for use in the archive. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to each ZipEntry added. This method has 2 overloads. The name of the directory to add. The ZipEntry added. Adds the contents of a filesystem directory to a Zip file archive, overriding the path to be used for entries in the archive. The name of the directory may be a relative path or a fully-qualified path. The add operation is recursive, so that any files or subdirectories within the name directory are also added to the archive. Top-level entries in the named directory will appear as top-level entries in the zip archive. Entries in subdirectories in the named directory will result in entries in subdirectories in the zip archive. For ZipFile properties including , , , , , , and , their respective values at the time of this call will be applied to each ZipEntry added. In this code, calling the ZipUp() method with a value of "c:\reports" for the directory parameter will result in a zip file structure in which all entries are contained in a toplevel "reports" directory. public void ZipUp(string targetZip, string directory) { using (var zip = new ZipFile()) { zip.AddDirectory(directory, System.IO.Path.GetFileName(directory)); zip.Save(targetZip); } } The name of the directory to add. Specifies a directory path to use to override any path in the DirectoryName. This path may, or may not, correspond to a real directory in the current filesystem. If the zip is later extracted, this is the path used for the extracted file or directory. Passing null (Nothing in VB) or the empty string ("") will insert the items at the root path within the archive. The ZipEntry added. Creates a directory in the zip archive. Use this when you want to create a directory in the archive but there is no corresponding filesystem representation for that directory. You will probably not need to do this in your code. One of the only times you will want to do this is if you want an empty directory in the zip archive. The reason: if you add a file to a zip archive that is stored within a multi-level directory, all of the directory tree is implicitly created in the zip archive. The name of the directory to create in the archive. The ZipEntry added. Checks a zip file to see if its directory is consistent. In cases of data error, the directory within a zip file can get out of synch with the entries in the zip file. This method checks the given zip file and returns true if this has occurred. This method may take a long time to run for large zip files. This method is not supported in the Reduced or Compact Framework versions of DotNetZip. Developers using COM can use the ComHelper.CheckZip(String) method. The filename to of the zip file to check. true if the named zip file checks OK. Otherwise, false. Checks a zip file to see if its directory is consistent, and optionally fixes the directory if necessary. In cases of data error, the directory within a zip file can get out of synch with the entries in the zip file. This method checks the given zip file, and returns true if this has occurred. It also optionally fixes the zipfile, saving the fixed copy in Name_Fixed.zip. This method may take a long time to run for large zip files. It will take even longer if the file actually needs to be fixed, and if fixIfNecessary is true. This method is not supported in the Reduced or Compact Framework versions of DotNetZip. The filename to of the zip file to check. If true, the method will fix the zip file if necessary. a TextWriter in which messages generated while checking will be written. true if the named zip is OK; false if the file needs to be fixed. Rewrite the directory within a zipfile. In cases of data error, the directory in a zip file can get out of synch with the entries in the zip file. This method attempts to fix the zip file if this has occurred. This can take a long time for large zip files. This won't work if the zip file uses a non-standard code page - neither IBM437 nor UTF-8. This method is not supported in the Reduced or Compact Framework versions of DotNetZip. Developers using COM can use the ComHelper.FixZipDirectory(String) method. The filename to of the zip file to fix. Verify the password on a zip file. Keep in mind that passwords in zipfiles are applied to zip entries, not to the entire zip file. So testing a zipfile for a particular password doesn't work in the general case. On the other hand, it's often the case that a single password will be used on all entries in a zip file. This method works for that case. There is no way to check a password without doing the decryption. So this code decrypts and extracts the given zipfile into The filename to of the zip file to fix. The password to check. a bool indicating whether the password matches. Provides a human-readable string with information about the ZipFile. The information string contains 10 lines or so, about each ZipEntry, describing whether encryption is in use, the compressed and uncompressed length of the entry, the offset of the entry, and so on. As a result the information string can be very long for zip files that contain many entries. This information is mostly useful for diagnostic purposes. Indicates whether to perform a full scan of the zip file when reading it. You almost never want to use this property. When reading a zip file, if this flag is true (True in VB), the entire zip archive will be scanned and searched for entries. For large archives, this can take a very, long time. The much more efficient default behavior is to read the zip directory, which is stored at the end of the zip file. But, in some cases the directory is corrupted and you need to perform a full scan of the zip file to determine the contents of the zip file. This property lets you do that, when necessary. This flag is effective only when calling . Normally you would read a ZipFile with the static ZipFile.Read method. But you can't set the FullScan property on the ZipFile instance when you use a static factory method like ZipFile.Read. This example shows how to read a zip file using the full scan approach, and then save it, thereby producing a corrected zip file. using (var zip = new ZipFile()) { zip.FullScan = true; zip.Initialize(zipFileName); zip.Save(newName); } Using zip As New ZipFile zip.FullScan = True zip.Initialize(zipFileName) zip.Save(newName) End Using Whether to sort the ZipEntries before saving the file. The default is false. If you have a large number of zip entries, the sort alone can consume significant time. using (var zip = new ZipFile()) { zip.AddFiles(filesToAdd); zip.SortEntriesBeforeSaving = true; zip.Save(name); } Using zip As New ZipFile zip.AddFiles(filesToAdd) zip.SortEntriesBeforeSaving = True zip.Save(name) End Using Indicates whether NTFS Reparse Points, like junctions, should be traversed during calls to AddDirectory(). By default, calls to AddDirectory() will traverse NTFS reparse points, like mounted volumes, and directory junctions. An example of a junction is the "My Music" directory in Windows Vista. In some cases you may not want DotNetZip to traverse those directories. In that case, set this property to false. using (var zip = new ZipFile()) { zip.AddDirectoryWillTraverseReparsePoints = false; zip.AddDirectory(dirToZip,"fodder"); zip.Save(zipFileToCreate); } Size of the IO buffer used while saving. First, let me say that you really don't need to bother with this. It is here to allow for optimizations that you probably won't make! It will work fine if you don't set or get this property at all. Ok? Now that we have that out of the way, the fine print: This property affects the size of the buffer that is used for I/O for each entry contained in the zip file. When a file is read in to be compressed, it uses a buffer given by the size here. When you update a zip file, the data for unmodified entries is copied from the first zip file to the other, through a buffer given by the size here. Changing the buffer size affects a few things: first, for larger buffer sizes, the memory used by the ZipFile, obviously, will be larger during I/O operations. This may make operations faster for very much larger files. Last, for any given entry, when you use a larger buffer there will be fewer progress events during I/O operations, because there's one progress event generated for each time the buffer is filled and then emptied. The default buffer size is 8k. Increasing the buffer size may speed things up as you compress larger files. But there are no hard-and-fast rules here, eh? You won't know til you test it. And there will be a limit where ever larger buffers actually slow things down. So as I said in the beginning, it's probably best if you don't set or get this property at all. This example shows how you might set a large buffer size for efficiency when dealing with zip entries that are larger than 1gb. using (ZipFile zip = new ZipFile()) { zip.SaveProgress += this.zip1_SaveProgress; zip.AddDirectory(directoryToZip, ""); zip.UseZip64WhenSaving = Zip64Option.Always; zip.BufferSize = 65536*8; // 65536 * 8 = 512k zip.Save(ZipFileToCreate); } Size of the work buffer to use for the ZLIB codec during compression. When doing ZLIB or Deflate compression, the library fills a buffer, then passes it to the compressor for compression. Then the library reads out the compressed bytes. This happens repeatedly until there is no more uncompressed data to compress. This property sets the size of the buffer that will be used for chunk-wise compression. In order for the setting to take effect, your application needs to set this property before calling one of the ZipFile.Save() overloads. Setting this affects the performance and memory efficiency of compression and decompression. For larger files, setting this to a larger size may improve compression performance, but the exact numbers vary depending on available memory, the size of the streams you are compressing, and a bunch of other variables. I don't have good firm recommendations on how to set it. You'll have to test it yourself. Or just leave it alone and accept the default. Indicates whether extracted files should keep their paths as stored in the zip archive. This property affects Extraction. It is not used when creating zip archives. With this property set to false, the default, extracting entries from a zip file will create files in the filesystem that have the full path associated to the entry within the zip file. With this property set to true, extracting entries from the zip file results in files with no path: the folders are "flattened." An example: suppose the zip file contains entries /directory1/file1.txt and /directory2/file2.txt. With FlattenFoldersOnExtract set to false, the files created will be \directory1\file1.txt and \directory2\file2.txt. With the property set to true, the files created are file1.txt and file2.txt. The compression strategy to use for all entries. Set the Strategy used by the ZLIB-compatible compressor, when compressing entries using the DEFLATE method. Different compression strategies work better on different sorts of data. The strategy parameter can affect the compression ratio and the speed of compression but not the correctness of the compresssion. For more information see Ionic.Zlib.CompressionStrategy. The name of the ZipFile, on disk. When the ZipFile instance was created by reading an archive using one of the ZipFile.Read methods, this property represents the name of the zip file that was read. When the ZipFile instance was created by using the no-argument constructor, this value is null (Nothing in VB). If you use the no-argument constructor, and you then explicitly set this property, when you call , this name will specify the name of the zip file created. Doing so is equivalent to calling . When instantiating a ZipFile by reading from a stream or byte array, the Name property remains null. When saving to a stream, the Name property is implicitly set to null. Sets the compression level to be used for entries subsequently added to the zip archive. Varying the compression level used on entries can affect the size-vs-speed tradeoff when compression and decompressing data streams or files. As with some other properties on the ZipFile class, like , , and , setting this property on a ZipFile instance will cause the specified CompressionLevel to be used on all items that are subsequently added to the ZipFile instance. If you set this property after you have added items to the ZipFile, but before you have called Save(), those items will not use the specified compression level. If you do not set this property, the default compression level is used, which normally gives a good balance of compression efficiency and compression speed. In some tests, using BestCompression can double the time it takes to compress, while delivering just a small increase in compression efficiency. This behavior will vary with the type of data you compress. If you are in doubt, just leave this setting alone, and accept the default. The compression method for the zipfile. By default, the compression method is CompressionMethod.Deflate. A comment attached to the zip archive. This property is read/write. It allows the application to specify a comment for the ZipFile, or read the comment for the ZipFile. After setting this property, changes are only made permanent when you call a Save() method. According to PKWARE's zip specification, the comment is not encrypted, even if there is a password set on the zip file. The specification does not describe how to indicate the encoding used on a comment string. Many "compliant" zip tools and libraries use IBM437 as the code page for comments; DotNetZip, too, follows that practice. On the other hand, there are situations where you want a Comment to be encoded with something else, for example using code page 950 "Big-5 Chinese". To fill that need, DotNetZip will encode the comment following the same procedure it follows for encoding filenames: (a) if is Never, it uses the default encoding (IBM437). (b) if is Always, it always uses the alternate encoding (). (c) if is AsNecessary, it uses the alternate encoding only if the default encoding is not sufficient for encoding the comment - in other words if decoding the result does not produce the original string. This decision is taken at the time of the call to ZipFile.Save(). When creating a zip archive using this library, it is possible to change the value of between each entry you add, and between adding entries and the call to Save(). Don't do this. It will likely result in a zip file that is not readable by any tool or application. For best interoperability, leave alone, or specify it only once, before adding any entries to the ZipFile instance. Specifies whether the Creation, Access, and Modified times for entries added to the zip file will be emitted in “Windows format” when the zip archive is saved. An application creating a zip archive can use this flag to explicitly specify that the file times for the entries should or should not be stored in the zip archive in the format used by Windows. By default this flag is true, meaning the Windows-format times are stored in the zip archive. When adding an entry from a file or directory, the Creation (), Access (), and Modified () times for the given entry are automatically set from the filesystem values. When adding an entry from a stream or string, all three values are implicitly set to DateTime.Now. Applications can also explicitly set those times by calling . PKWARE's zip specification describes multiple ways to format these times in a zip file. One is the format Windows applications normally use: 100ns ticks since January 1, 1601 UTC. The other is a format Unix applications typically use: seconds since January 1, 1970 UTC. Each format can be stored in an "extra field" in the zip entry when saving the zip archive. The former uses an extra field with a Header Id of 0x000A, while the latter uses a header ID of 0x5455, although you probably don't need to know that. Not all tools and libraries can interpret these fields. Windows compressed folders is one that can read the Windows Format timestamps, while I believe the Infozip tools can read the Unix format timestamps. Some tools and libraries may be able to read only one or the other. DotNetZip can read or write times in either or both formats. The times stored are taken from , , and . The value set here applies to all entries subsequently added to the ZipFile. This property is not mutually exclusive of the property. It is possible and legal and valid to produce a zip file that contains timestamps encoded in the Unix format as well as in the Windows format, in addition to the LastModified time attached to each entry in the archive, a time that is always stored in "DOS format". And, notwithstanding the names PKWare uses for these time formats, any of them can be read and written by any computer, on any operating system. But, there are no guarantees that a program running on Mac or Linux will gracefully handle a zip file with "Windows" formatted times, or that an application that does not use DotNetZip but runs on Windows will be able to handle file times in Unix format. When in doubt, test. Sorry, I haven't got a complete list of tools and which sort of timestamps they can use and will tolerate. If you get any good information and would like to pass it on, please do so and I will include that information in this documentation. This example shows how to save a zip file that contains file timestamps in a format normally used by Unix. using (var zip = new ZipFile()) { // produce a zip file the Mac will like zip.EmitTimesInWindowsFormatWhenSaving = false; zip.EmitTimesInUnixFormatWhenSaving = true; zip.AddDirectory(directoryToZip, "files"); zip.Save(outputFile); } Using zip As New ZipFile '' produce a zip file the Mac will like zip.EmitTimesInWindowsFormatWhenSaving = False zip.EmitTimesInUnixFormatWhenSaving = True zip.AddDirectory(directoryToZip, "files") zip.Save(outputFile) End Using Specifies whether the Creation, Access, and Modified times for entries added to the zip file will be emitted in "Unix(tm) format" when the zip archive is saved. An application creating a zip archive can use this flag to explicitly specify that the file times for the entries should or should not be stored in the zip archive in the format used by Unix. By default this flag is false, meaning the Unix-format times are not stored in the zip archive. When adding an entry from a file or directory, the Creation (), Access (), and Modified () times for the given entry are automatically set from the filesystem values. When adding an entry from a stream or string, all three values are implicitly set to DateTime.Now. Applications can also explicitly set those times by calling . PKWARE's zip specification describes multiple ways to format these times in a zip file. One is the format Windows applications normally use: 100ns ticks since January 1, 1601 UTC. The other is a format Unix applications typically use: seconds since January 1, 1970 UTC. Each format can be stored in an "extra field" in the zip entry when saving the zip archive. The former uses an extra field with a Header Id of 0x000A, while the latter uses a header ID of 0x5455, although you probably don't need to know that. Not all tools and libraries can interpret these fields. Windows compressed folders is one that can read the Windows Format timestamps, while I believe the Infozip tools can read the Unix format timestamps. Some tools and libraries may be able to read only one or the other. DotNetZip can read or write times in either or both formats. The times stored are taken from , , and . This property is not mutually exclusive of the property. It is possible and legal and valid to produce a zip file that contains timestamps encoded in the Unix format as well as in the Windows format, in addition to the LastModified time attached to each entry in the zip archive, a time that is always stored in "DOS format". And, notwithstanding the names PKWare uses for these time formats, any of them can be read and written by any computer, on any operating system. But, there are no guarantees that a program running on Mac or Linux will gracefully handle a zip file with "Windows" formatted times, or that an application that does not use DotNetZip but runs on Windows will be able to handle file times in Unix format. When in doubt, test. Sorry, I haven't got a complete list of tools and which sort of timestamps they can use and will tolerate. If you get any good information and would like to pass it on, please do so and I will include that information in this documentation. Indicates whether verbose output is sent to the during AddXxx() and ReadXxx() operations. This is a synthetic property. It returns true if the is non-null. Returns true if an entry by the given name exists in the ZipFile. the name of the entry to find true if an entry with the given name exists; otherwise false. Indicates whether to perform case-sensitive matching on the filename when retrieving entries in the zipfile via the string-based indexer. The default value is false, which means don't do case-sensitive matching. In other words, retrieving zip["ReadMe.Txt"] is the same as zip["readme.txt"]. It really makes sense to set this to true only if you are not running on Windows, which has case-insensitive filenames. But since this library is not built for non-Windows platforms, in most cases you should just leave this property alone. Indicates whether to encode entry filenames and entry comments using Unicode (UTF-8). The PKWare zip specification provides for encoding file names and file comments in either the IBM437 code page, or in UTF-8. This flag selects the encoding according to that specification. By default, this flag is false, and filenames and comments are encoded into the zip file in the IBM437 codepage. Setting this flag to true will specify that filenames and comments that cannot be encoded with IBM437 will be encoded with UTF-8. Zip files created with strict adherence to the PKWare specification with respect to UTF-8 encoding can contain entries with filenames containing any combination of Unicode characters, including the full range of characters from Chinese, Latin, Hebrew, Greek, Cyrillic, and many other alphabets. However, because at this time, the UTF-8 portion of the PKWare specification is not broadly supported by other zip libraries and utilities, such zip files may not be readable by your favorite zip tool or archiver. In other words, interoperability will decrease if you set this flag to true. In particular, Zip files created with strict adherence to the PKWare specification with respect to UTF-8 encoding will not work well with Explorer in Windows XP or Windows Vista, because Windows compressed folders, as far as I know, do not support UTF-8 in zip files. Vista can read the zip files, but shows the filenames incorrectly. Unpacking from Windows Vista Explorer will result in filenames that have rubbish characters in place of the high-order UTF-8 bytes. Also, zip files that use UTF-8 encoding will not work well with Java applications that use the java.util.zip classes, as of v5.0 of the Java runtime. The Java runtime does not correctly implement the PKWare specification in this regard. As a result, we have the unfortunate situation that "correct" behavior by the DotNetZip library with regard to Unicode encoding of filenames during zip creation will result in zip files that are readable by strictly compliant and current tools (for example the most recent release of the commercial WinZip tool); but these zip files will not be readable by various other tools or libraries, including Windows Explorer. The DotNetZip library can read and write zip files with UTF8-encoded entries, according to the PKware spec. If you use DotNetZip for both creating and reading the zip file, and you use UTF-8, there will be no loss of information in the filenames. For example, using a self-extractor created by this library will allow you to unpack files correctly with no loss of information in the filenames. If you do not set this flag, it will remain false. If this flag is false, your ZipFile will encode all filenames and comments using the IBM437 codepage. This can cause "loss of information" on some filenames, but the resulting zipfile will be more interoperable with other utilities. As an example of the loss of information, diacritics can be lost. The o-tilde character will be down-coded to plain o. The c with a cedilla (Unicode 0xE7) used in Portugese will be downcoded to a c. Likewise, the O-stroke character (Unicode 248), used in Danish and Norwegian, will be down-coded to plain o. Chinese characters cannot be represented in codepage IBM437; when using the default encoding, Chinese characters in filenames will be represented as ?. These are all examples of "information loss". The loss of information associated to the use of the IBM437 encoding is inconvenient, and can also lead to runtime errors. For example, using IBM437, any sequence of 4 Chinese characters will be encoded as ????. If your application creates a ZipFile, then adds two files, each with names of four Chinese characters each, this will result in a duplicate filename exception. In the case where you add a single file with a name containing four Chinese characters, calling Extract() on the entry that has question marks in the filename will result in an exception, because the question mark is not legal for use within filenames on Windows. These are just a few examples of the problems associated to loss of information. This flag is independent of the encoding of the content within the entries in the zip file. Think of the zip file as a container - it supports an encoding. Within the container are other "containers" - the file entries themselves. The encoding within those entries is independent of the encoding of the zip archive container for those entries. Rather than specify the encoding in a binary fashion using this flag, an application can specify an arbitrary encoding via the property. Setting the encoding explicitly when creating zip archives will result in non-compliant zip files that, curiously, are fairly interoperable. The challenge is, the PKWare specification does not provide for a way to specify that an entry in a zip archive uses a code page that is neither IBM437 nor UTF-8. Therefore if you set the encoding explicitly when creating a zip archive, you must take care upon reading the zip archive to use the same code page. If you get it wrong, the behavior is undefined and may result in incorrect filenames, exceptions, stomach upset, hair loss, and acne. Specify whether to use ZIP64 extensions when saving a zip archive. When creating a zip file, the default value for the property is . is safest, in the sense that you will not get an Exception if a pre-ZIP64 limit is exceeded. You may set the property at any time before calling Save(). When reading a zip file via the Zipfile.Read() method, DotNetZip will properly read ZIP64-endowed zip archives, regardless of the value of this property. DotNetZip will always read ZIP64 archives. This property governs only whether DotNetZip will write them. Therefore, when updating archives, be careful about setting this property after reading an archive that may use ZIP64 extensions. An interesting question is, if you have set this property to AsNecessary, and then successfully saved, does the resulting archive use ZIP64 extensions or not? To learn this, check the property, after calling Save(). Have you thought about donating? Indicates whether the archive requires ZIP64 extensions. This property is null (or Nothing in VB) if the archive has not been saved, and there are fewer than 65334 ZipEntry items contained in the archive. The Value is true if any of the following four conditions holds: the uncompressed size of any entry is larger than 0xFFFFFFFF; the compressed size of any entry is larger than 0xFFFFFFFF; the relative offset of any entry within the zip archive is larger than 0xFFFFFFFF; or there are more than 65534 entries in the archive. (0xFFFFFFFF = 4,294,967,295). The result may not be known until a Save() is attempted on the zip archive. The Value of this property may be set only AFTER one of the Save() methods has been called. If none of the four conditions holds, and the archive has been saved, then the Value is false. A Value of false does not indicate that the zip archive, as saved, does not use ZIP64. It merely indicates that ZIP64 is not required. An archive may use ZIP64 even when not required if the property is set to , or if the property is set to and the output stream was not seekable. Use the property to determine if the most recent Save() method resulted in an archive that utilized the ZIP64 extensions. Indicates whether the most recent Save() operation used ZIP64 extensions. The use of ZIP64 extensions within an archive is not always necessary, and for interoperability concerns, it may be desired to NOT use ZIP64 if possible. The property can be set to use ZIP64 extensions only when necessary. In those cases, Sometimes applications want to know whether a Save() actually used ZIP64 extensions. Applications can query this read-only property to learn whether ZIP64 has been used in a just-saved ZipFile. The value is null (or Nothing in VB) if the archive has not been saved. Non-null values (HasValue is true) indicate whether ZIP64 extensions were used during the most recent Save() operation. The ZIP64 extensions may have been used as required by any particular entry because of its uncompressed or compressed size, or because the archive is larger than 4294967295 bytes, or because there are more than 65534 entries in the archive, or because the UseZip64WhenSaving property was set to , or because the UseZip64WhenSaving property was set to and the output stream was not seekable. The value of this property does not indicate the reason the ZIP64 extensions were used. Indicates whether the most recent Read() operation read a zip file that uses ZIP64 extensions. This property will return null (Nothing in VB) if you've added an entry after reading the zip file. The text encoding to use when writing new entries to the ZipFile, for those entries that cannot be encoded with the default (IBM437) encoding; or, the text encoding that was used when reading the entries from the ZipFile. In its zip specification, PKWare describes two options for encoding filenames and comments: using IBM437 or UTF-8. But, some archiving tools or libraries do not follow the specification, and instead encode characters using the system default code page. For example, WinRAR when run on a machine in Shanghai may encode filenames with the Big-5 Chinese (950) code page. This behavior is contrary to the Zip specification, but it occurs anyway. When using DotNetZip to write zip archives that will be read by one of these other archivers, set this property to specify the code page to use when encoding the and for each ZipEntry in the zip file, for values that cannot be encoded with the default codepage for zip files, IBM437. This is why this property is "provisional". In all cases, IBM437 is used where possible, in other words, where no loss of data would result. It is possible, therefore, to have a given entry with a Comment encoded in IBM437 and a FileName encoded with the specified "provisional" codepage. Be aware that a zip file created after you've explicitly set the property to a value other than IBM437 may not be compliant to the PKWare specification, and may not be readable by compliant archivers. On the other hand, many (most?) archivers are non-compliant and can read zip files created in arbitrary code pages. The trick is to use or specify the proper codepage when reading the zip. When creating a zip archive using this library, it is possible to change the value of between each entry you add, and between adding entries and the call to Save(). Don't do this. It will likely result in a zipfile that is not readable. For best interoperability, either leave alone, or specify it only once, before adding any entries to the ZipFile instance. There is one exception to this recommendation, described later. When using an arbitrary, non-UTF8 code page for encoding, there is no standard way for the creator application - whether DotNetZip, WinZip, WinRar, or something else - to formally specify in the zip file which codepage has been used for the entries. As a result, readers of zip files are not able to inspect the zip file and determine the codepage that was used for the entries contained within it. It is left to the application or user to determine the necessary codepage when reading zip files encoded this way. In other words, if you explicitly specify the codepage when you create the zipfile, you must explicitly specify the same codepage when reading the zipfile. The way you specify the code page to use when reading a zip file varies depending on the tool or library you use to read the zip. In DotNetZip, you use a ZipFile.Read() method that accepts an encoding parameter. It isn't possible with Windows Explorer, as far as I know, to specify an explicit codepage to use when reading a zip. If you use an incorrect codepage when reading a zipfile, you will get entries with filenames that are incorrect, and the incorrect filenames may even contain characters that are not legal for use within filenames in Windows. Extracting entries with illegal characters in the filenames will lead to exceptions. It's too bad, but this is just the way things are with code pages in zip files. Caveat Emptor. Example: Suppose you create a zipfile that contains entries with filenames that have Danish characters. If you use equal to "iso-8859-1" (cp 28591), the filenames will be correctly encoded in the zip. But, to read that zipfile correctly, you have to specify the same codepage at the time you read it. If try to read that zip file with Windows Explorer or another application that is not flexible with respect to the codepage used to decode filenames in zipfiles, you will get a filename like "Inf�.txt". When using DotNetZip to read a zip archive, and the zip archive uses an arbitrary code page, you must specify the encoding to use before or when the Zipfile is READ. This means you must use a ZipFile.Read() method that allows you to specify a System.Text.Encoding parameter. Setting the ProvisionalAlternateEncoding property after your application has read in the zip archive will not affect the entry names of entries that have already been read in. And now, the exception to the rule described above. One strategy for specifying the code page for a given zip file is to describe the code page in a human-readable form in the Zip comment. For example, the comment may read "Entries in this archive are encoded in the Big5 code page". For maximum interoperability, the zip comment in this case should be encoded in the default, IBM437 code page. In this case, the zip comment is encoded using a different page than the filenames. To do this, Specify ProvisionalAlternateEncoding to your desired region-specific code page, once before adding any entries, and then reset ProvisionalAlternateEncoding to IBM437 before setting the property and calling Save(). This example shows how to read a zip file using the Big-5 Chinese code page (950), and extract each entry in the zip file. For this code to work as desired, the Zipfile must have been created using the big5 code page (CP950). This is typical, for example, when using WinRar on a machine with CP950 set as the default code page. In that case, the names of entries within the Zip archive will be stored in that code page, and reading the zip archive must be done using that code page. If the application did not use the correct code page in ZipFile.Read(), then names of entries within the zip archive would not be correctly retrieved. using (var zip = ZipFile.Read(zipFileName, System.Text.Encoding.GetEncoding("big5"))) { // retrieve and extract an entry using a name encoded with CP950 zip[MyDesiredEntry].Extract("unpack"); } Using zip As ZipFile = ZipFile.Read(ZipToExtract, System.Text.Encoding.GetEncoding("big5")) ' retrieve and extract an entry using a name encoded with CP950 zip(MyDesiredEntry).Extract("unpack") End Using DefaultEncoding A Text Encoding to use when encoding the filenames and comments for all the ZipEntry items, during a ZipFile.Save() operation. Whether the encoding specified here is used during the save depends on . A flag that tells if and when this instance should apply AlternateEncoding to encode the filenames and comments associated to of ZipEntry objects contained within this instance. The default text encoding used in zip archives. It is numeric 437, also known as IBM437. Gets or sets the TextWriter to which status messages are delivered for the instance. If the TextWriter is set to a non-null value, then verbose output is sent to the TextWriter during Add, Read, Save and Extract operations. Typically, console applications might use Console.Out and graphical or headless applications might use a System.IO.StringWriter. The output of this is suitable for viewing by humans. In this example, a console application instantiates a ZipFile, then sets the StatusMessageTextWriter to Console.Out. At that point, all verbose status messages for that ZipFile are sent to the console. using (ZipFile zip= ZipFile.Read(FilePath)) { zip.StatusMessageTextWriter= System.Console.Out; // messages are sent to the console during extraction zip.ExtractAll(); } Using zip As ZipFile = ZipFile.Read(FilePath) zip.StatusMessageTextWriter= System.Console.Out 'Status Messages will be sent to the console during extraction zip.ExtractAll() End Using In this example, a Windows Forms application instantiates a ZipFile, then sets the StatusMessageTextWriter to a StringWriter. At that point, all verbose status messages for that ZipFile are sent to the StringWriter. var sw = new System.IO.StringWriter(); using (ZipFile zip= ZipFile.Read(FilePath)) { zip.StatusMessageTextWriter= sw; zip.ExtractAll(); } Console.WriteLine("{0}", sw.ToString()); Dim sw as New System.IO.StringWriter Using zip As ZipFile = ZipFile.Read(FilePath) zip.StatusMessageTextWriter= sw zip.ExtractAll() End Using 'Status Messages are now available in sw Gets or sets the name for the folder to store the temporary file this library writes when saving a zip archive. This library will create a temporary file when saving a Zip archive to a file. This file is written when calling one of the Save() methods that does not save to a stream, or one of the SaveSelfExtractor() methods. By default, the library will create the temporary file in the directory specified for the file itself, via the property or via the method. Setting this property allows applications to override this default behavior, so that the library will create the temporary file in the specified folder. For example, to have the library create the temporary file in the current working directory, regardless where the ZipFile is saved, specfy ".". To revert to the default behavior, set this property to null (Nothing in VB). When setting the property to a non-null value, the folder specified must exist; if it does not an exception is thrown. The application should have write and delete permissions on the folder. The permissions are not explicitly checked ahead of time; if the application does not have the appropriate rights, an exception will be thrown at the time Save() is called. There is no temporary file created when reading a zip archive. When saving to a Stream, there is no temporary file created. For example, if the application is an ASP.NET application and calls Save() specifying the Response.OutputStream as the output stream, there is no temporary file created. Thrown when setting the property if the directory does not exist. Sets the password to be used on the ZipFile instance. When writing a zip archive, this password is applied to the entries, not to the zip archive itself. It applies to any ZipEntry subsequently added to the ZipFile, using one of the AddFile, AddDirectory, AddEntry, or AddItem methods, etc. When reading a zip archive, this property applies to any entry subsequently extracted from the ZipFile using one of the Extract methods on the ZipFile class. When writing a zip archive, keep this in mind: though the password is set on the ZipFile object, according to the Zip spec, the "directory" of the archive - in other words the list of entries or files contained in the archive - is not encrypted with the password, or protected in any way. If you set the Password property, the password actually applies to individual entries that are added to the archive, subsequent to the setting of this property. The list of filenames in the archive that is eventually created will appear in clear text, but the contents of the individual files are encrypted. This is how Zip encryption works. One simple way around this limitation is to simply double-wrap sensitive filenames: Store the files in a zip file, and then store that zip file within a second, "outer" zip file. If you apply a password to the outer zip file, then readers will be able to see that the outer zip file contains an inner zip file. But readers will not be able to read the directory or file list of the inner zip file. If you set the password on the ZipFile, and then add a set of files to the archive, then each entry is encrypted with that password. You may also want to change the password between adding different entries. If you set the password, add an entry, then set the password to null (Nothing in VB), and add another entry, the first entry is encrypted and the second is not. If you call AddFile(), then set the Password property, then call ZipFile.Save, the file added will not be password-protected, and no warning will be generated. When setting the Password, you may also want to explicitly set the property, to specify how to encrypt the entries added to the ZipFile. If you set the Password to a non-null value and do not set , then PKZip 2.0 ("Weak") encryption is used. This encryption is relatively weak but is very interoperable. If you set the password to a null value (Nothing in VB), Encryption is reset to None. All of the preceding applies to writing zip archives, in other words when you use one of the Save methods. To use this property when reading or an existing ZipFile, do the following: set the Password property on the ZipFile, then call one of the Extract() overloads on the . In this case, the entry is extracted using the Password that is specified on the ZipFile instance. If you have not set the Password property, then the password is null, and the entry is extracted with no password. If you set the Password property on the ZipFile, then call Extract() an entry that has not been encrypted with a password, the password is not used for that entry, and the ZipEntry is extracted as normal. In other words, the password is used only if necessary. The class also has a Password property. It takes precedence over this property on the ZipFile. Typically, you would use the per-entry Password when most entries in the zip archive use one password, and a few entries use a different password. If all entries in the zip file use the same password, then it is simpler to just set this property on the ZipFile itself, whether creating a zip archive or extracting a zip archive. This example creates a zip file, using password protection for the entries, and then extracts the entries from the zip file. When creating the zip file, the Readme.txt file is not protected with a password, but the other two are password-protected as they are saved. During extraction, each file is extracted with the appropriate password. // create a file with encryption using (ZipFile zip = new ZipFile()) { zip.AddFile("ReadMe.txt"); zip.Password= "!Secret1"; zip.AddFile("MapToTheSite-7440-N49th.png"); zip.AddFile("2008-Regional-Sales-Report.pdf"); zip.Save("EncryptedArchive.zip"); } // extract entries that use encryption using (ZipFile zip = ZipFile.Read("EncryptedArchive.zip")) { zip.Password= "!Secret1"; zip.ExtractAll("extractDir"); } Using zip As New ZipFile zip.AddFile("ReadMe.txt") zip.Password = "123456!" zip.AddFile("MapToTheSite-7440-N49th.png") zip.Password= "!Secret1"; zip.AddFile("2008-Regional-Sales-Report.pdf") zip.Save("EncryptedArchive.zip") End Using ' extract entries that use encryption Using (zip as ZipFile = ZipFile.Read("EncryptedArchive.zip")) zip.Password= "!Secret1" zip.ExtractAll("extractDir") End Using ZipFile.Encryption ZipEntry.Password The action the library should take when extracting a file that already exists. This property affects the behavior of the Extract methods (one of the Extract() or ExtractWithPassword() overloads), when extraction would would overwrite an existing filesystem file. If you do not set this property, the library throws an exception when extracting an entry would overwrite an existing file. This property has no effect when extracting to a stream, or when the file to be extracted does not already exist. The action the library should take when an error is encountered while opening or reading files as they are saved into a zip archive. Errors can occur as a file is being saved to the zip archive. For example, the File.Open may fail, or a File.Read may fail, because of lock conflicts or other reasons. The first problem might occur after having called AddDirectory() on a directory that contains a Clipper .dbf file; the file is locked by Clipper and cannot be opened for read by another process. An example of the second problem might occur when trying to zip a .pst file that is in use by Microsoft Outlook. Outlook locks a range on the file, which allows other processes to open the file, but not read it in its entirety. This property tells DotNetZip what you would like to do in the case of these errors. The primary options are: ZipErrorAction.Throw to throw an exception (this is the default behavior if you don't set this property); ZipErrorAction.Skip to Skip the file for which there was an error and continue saving; ZipErrorAction.Retry to Retry the entry that caused the problem; or ZipErrorAction.InvokeErrorEvent to invoke an event handler. This property is implicitly set to ZipErrorAction.InvokeErrorEvent if you add a handler to the event. If you set this property to something other than ZipErrorAction.InvokeErrorEvent, then the ZipError event is implicitly cleared. What it means is you can set one or the other (or neither), depending on what you want, but you never need to set both. As with some other properties on the ZipFile class, like , , and , setting this property on a ZipFile instance will cause the specified ZipErrorAction to be used on all items that are subsequently added to the ZipFile instance. If you set this property after you have added items to the ZipFile, but before you have called Save(), those items will not use the specified error handling action. If you want to handle any errors that occur with any entry in the zip file in the same way, then set this property once, before adding any entries to the zip archive. If you set this property to ZipErrorAction.Skip and you'd like to learn which files may have been skipped after a Save(), you can set the on the ZipFile before calling Save(). A message will be emitted into that writer for each skipped file, if any. This example shows how to tell DotNetZip to skip any files for which an error is generated during the Save(). Public Sub SaveZipFile() Dim SourceFolder As String = "fodder" Dim DestFile As String = "eHandler.zip" Dim sw as New StringWriter Using zipArchive As ZipFile = New ZipFile ' Tell DotNetZip to skip any files for which it encounters an error zipArchive.ZipErrorAction = ZipErrorAction.Skip zipArchive.StatusMessageTextWriter = sw zipArchive.AddDirectory(SourceFolder) zipArchive.Save(DestFile) End Using ' examine sw here to see any messages End Sub The Encryption to use for entries added to the ZipFile. Set this when creating a zip archive, or when updating a zip archive. The specified Encryption is applied to the entries subsequently added to the ZipFile instance. Applications do not need to set the Encryption property when reading or extracting a zip archive. If you set this to something other than EncryptionAlgorithm.None, you will also need to set the . As with some other properties on the ZipFile class, like and , setting this property on a ZipFile instance will cause the specified EncryptionAlgorithm to be used on all items that are subsequently added to the ZipFile instance. In other words, if you set this property after you have added items to the ZipFile, but before you have called Save(), those items will not be encrypted or protected with a password in the resulting zip archive. To get a zip archive with encrypted entries, set this property, along with the property, before calling AddFile, AddItem, or AddDirectory (etc.) on the ZipFile instance. If you read a ZipFile, you can modify the Encryption on an encrypted entry, only by setting the Encryption property on the ZipEntry itself. Setting the Encryption property on the ZipFile, once it has been created via a call to ZipFile.Read(), does not affect entries that were previously read. For example, suppose you read a ZipFile, and there is an encrypted entry. Setting the Encryption property on that ZipFile and then calling Save() on the ZipFile does not update the Encryption used for the entries in the archive. Neither is an exception thrown. Instead, what happens during the Save() is that all previously existing entries are copied through to the new zip archive, with whatever encryption and password that was used when originally creating the zip archive. Upon re-reading that archive, to extract entries, applications should use the original password or passwords, if any. Suppose an application reads a ZipFile, and there is an encrypted entry. Setting the Encryption property on that ZipFile and then adding new entries (via AddFile(), AddEntry(), etc) and then calling Save() on the ZipFile does not update the Encryption on any of the entries that had previously been in the ZipFile. The Encryption property applies only to the newly-added entries. This example creates a zip archive that uses encryption, and then extracts entries from the archive. When creating the zip archive, the ReadMe.txt file is zipped without using a password or encryption. The other files use encryption. // Create a zip archive with AES Encryption. using (ZipFile zip = new ZipFile()) { zip.AddFile("ReadMe.txt"); zip.Encryption= EncryptionAlgorithm.WinZipAes256; zip.Password= "Top.Secret.No.Peeking!"; zip.AddFile("7440-N49th.png"); zip.AddFile("2008-Regional-Sales-Report.pdf"); zip.Save("EncryptedArchive.zip"); } // Extract a zip archive that uses AES Encryption. // You do not need to specify the algorithm during extraction. using (ZipFile zip = ZipFile.Read("EncryptedArchive.zip")) { zip.Password= "Top.Secret.No.Peeking!"; zip.ExtractAll("extractDirectory"); } ' Create a zip that uses Encryption. Using zip As New ZipFile() zip.Encryption= EncryptionAlgorithm.WinZipAes256 zip.Password= "Top.Secret.No.Peeking!" zip.AddFile("ReadMe.txt") zip.AddFile("7440-N49th.png") zip.AddFile("2008-Regional-Sales-Report.pdf") zip.Save("EncryptedArchive.zip") End Using ' Extract a zip archive that uses AES Encryption. ' You do not need to specify the algorithm during extraction. Using (zip as ZipFile = ZipFile.Read("EncryptedArchive.zip")) zip.Password= "Top.Secret.No.Peeking!" zip.ExtractAll("extractDirectory") End Using ZipFile.Password ZipEntry.Encryption A callback that allows the application to specify the compression level to use for entries subsequently added to the zip archive. With this callback, the DotNetZip library allows the application to determine whether compression will be used, at the time of the Save. This may be useful if the application wants to favor speed over size, and wants to defer the decision until the time of Save. Typically applications set the property on the ZipFile or on each ZipEntry to determine the level of compression used. This is done at the time the entry is added to the ZipFile. Setting the property to Ionic.Zlib.CompressionLevel.None means no compression will be used. This callback allows the application to defer the decision on the CompressionLevel to use, until the time of the call to ZipFile.Save(). The callback is invoked once per ZipEntry, at the time the data for the entry is being written out as part of a Save() operation. The application can use whatever criteria it likes in determining the level to return. For example, an application may wish that no .mp3 files should be compressed, because they are already compressed and the extra compression is not worth the CPU time incurred, and so can return None for all .mp3 entries. The library determines whether compression will be attempted for an entry this way: If the entry is a zero length file, or a directory, no compression is used. Otherwise, if this callback is set, it is invoked and the CompressionLevel is set to the return value. If this callback has not been set, then the previously set value for CompressionLevel is used. The maximum size of an output segment, when saving a split Zip file. Set this to a non-zero value before calling or to specify that the ZipFile should be saved as a split archive, also sometimes called a spanned archive. Some also call them multi-file archives. A split zip archive is saved in a set of discrete filesystem files, rather than in a single file. This is handy when transmitting the archive in email or some other mechanism that has a limit to the size of each file. The first file in a split archive will be named basename.z01, the second will be named basename.z02, and so on. The final file is named basename.zip. According to the zip specification from PKWare, the minimum value is 65536, for a 64k segment size. The maximum number of segments allows in a split archive is 99. The value of this property determines the maximum size of a split segment when writing a split archive. For example, suppose you have a ZipFile that would save to a single file of 200k. If you set the MaxOutputSegmentSize to 65536 before calling Save(), you will get four distinct output files. On the other hand if you set this property to 256k, then you will get a single-file archive for that ZipFile. The size of each split output file will be as large as possible, up to the maximum size set here. The zip specification requires that some data fields in a zip archive may not span a split boundary, and an output segment may be smaller than the maximum if necessary to avoid that problem. Also, obviously the final segment of the archive may be smaller than the maximum segment size. Segments will never be larger than the value set with this property. You can save a split Zip file only when saving to a regular filesystem file. It's not possible to save a split zip file as a self-extracting archive, nor is it possible to save a split zip file to a stream. When saving to a SFX or to a Stream, this property is ignored. About interoperability: Split or spanned zip files produced by DotNetZip can be read by WinZip or PKZip, and vice-versa. Segmented zip files may not be readable by other tools, if those other tools don't support zip spanning or splitting. When in doubt, test. I don't believe Windows Explorer can extract a split archive. This property has no effect when reading a split archive. You can read a split archive in the normal way with DotNetZip. When saving a zip file, if you want a regular zip file rather than a split zip file, don't set this property, or set it to Zero. If you read a split archive, with and then subsequently call ZipFile.Save(), unless you set this property before calling Save(), you will get a normal, single-file archive. Returns the number of segments used in the most recent Save() operation. This is normally zero, unless you have set the property. If you have set , and then you save a file, after the call to Save() completes, you can read this value to learn the number of segments that were created. If you call Save("Archive.zip"), and it creates 5 segments, then you will have filesystem files named Archive.z01, Archive.z02, Archive.z03, Archive.z04, and Archive.zip, and the value of this property will be 5. The size threshold for an entry, above which a parallel deflate is used. DotNetZip will use multiple threads to compress any ZipEntry, if the entry is larger than the given size. Zero means "always use parallel deflate", while -1 means "never use parallel deflate". The default value for this property is 512k. Aside from the special values of 0 and 1, the minimum value is 65536. If the entry size cannot be known before compression, as with a read-forward stream, then Parallel deflate will never be performed, unless the value of this property is zero. A parallel deflate operations will speed up the compression of large files, on computers with multiple CPUs or multiple CPU cores. For files above 1mb, on a dual core or dual-cpu (2p) machine, the time required to compress the file can be 70% of the single-threaded deflate. For very large files on 4p machines the compression can be done in 30% of the normal time. The downside is that parallel deflate consumes extra memory during the deflate, and the deflation is not as effective. Parallel deflate tends to yield slightly less compression when compared to as single-threaded deflate; this is because the original data stream is split into multiple independent buffers, each of which is compressed in parallel. But because they are treated independently, there is no opportunity to share compression dictionaries. For that reason, a deflated stream may be slightly larger when compressed using parallel deflate, as compared to a traditional single-threaded deflate. Sometimes the increase over the normal deflate is as much as 5% of the total compressed size. For larger files it can be as small as 0.1%. Multi-threaded compression does not give as much an advantage when using Encryption. This is primarily because encryption tends to slow down the entire pipeline. Also, multi-threaded compression gives less of an advantage when using lower compression levels, for example . You may have to perform some tests to determine the best approach for your situation. The maximum number of buffer pairs to use when performing parallel compression. This property sets an upper limit on the number of memory buffer pairs to create when performing parallel compression. The implementation of the parallel compression stream allocates multiple buffers to facilitate parallel compression. As each buffer fills up, the stream uses ThreadPool.QueueUserWorkItem() to compress those buffers in a background threadpool thread. After a buffer is compressed, it is re-ordered and written to the output stream. A higher number of buffer pairs enables a higher degree of parallelism, which tends to increase the speed of compression on multi-cpu computers. On the other hand, a higher number of buffer pairs also implies a larger memory consumption, more active worker threads, and a higher cpu utilization for any compression. This property enables the application to limit its memory consumption and CPU utilization behavior depending on requirements. For each compression "task" that occurs in parallel, there are 2 buffers allocated: one for input and one for output. This property sets a limit for the number of pairs. The total amount of storage space allocated for buffering will then be (N*S*2), where N is the number of buffer pairs, S is the size of each buffer (). By default, DotNetZip allocates 4 buffer pairs per CPU core, so if your machine has 4 cores, and you retain the default buffer size of 128k, then the ParallelDeflateOutputStream will use 4 * 4 * 2 * 128kb of buffer memory in total, or 4mb, in blocks of 128kb. If you then set this property to 8, then the number will be 8 * 2 * 128kb of buffer memory, or 2mb. CPU utilization will also go up with additional buffers, because a larger number of buffer pairs allows a larger number of background threads to compress in parallel. If you find that parallel compression is consuming too much memory or CPU, you can adjust this value downward. The default value is 16. Different values may deliver better or worse results, depending on your priorities and the dynamic performance characteristics of your storage and compute resources. This property is not the number of buffer pairs to use; it is an upper limit. An illustration: Suppose you have an application that uses the default value of this property (which is 16), and it runs on a machine with 2 CPU cores. In that case, DotNetZip will allocate 4 buffer pairs per CPU core, for a total of 8 pairs. The upper limit specified by this property has no effect. The application can set this value at any time before calling ZipFile.Save(). Provides a string representation of the instance. a string representation of the instance. Returns the version number on the DotNetZip assembly. This property is exposed as a convenience. Callers could also get the version value by retrieving GetName().Version on the System.Reflection.Assembly object pointing to the DotNetZip assembly. But sometimes it is not clear which assembly is being loaded. This property makes it clear. This static property is primarily useful for diagnostic purposes. Creates a new ZipFile instance, using the specified filename. Applications can use this constructor to create a new ZipFile for writing, or to slurp in an existing zip archive for read and update purposes. To create a new zip archive, an application can call this constructor, passing the name of a file that does not exist. The name may be a fully qualified path. Then the application can add directories or files to the ZipFile via AddDirectory(), AddFile(), AddItem() and then write the zip archive to the disk by calling Save(). The zip file is not actually opened and written to the disk until the application calls ZipFile.Save(). At that point the new zip file with the given name is created. If you won't know the name of the Zipfile until the time you call ZipFile.Save(), or if you plan to save to a stream (which has no name), then you should use the no-argument constructor. The application can also call this constructor to read an existing zip archive. passing the name of a valid zip file that does exist. But, it's better form to use the static method, passing the name of the zip file, because using ZipFile.Read() in your code communicates very clearly what you are doing. In either case, the file is then read into the ZipFile instance. The app can then enumerate the entries or can modify the zip file, for example adding entries, removing entries, changing comments, and so on. One advantage to this parameterized constructor: it allows applications to use the same code to add items to a zip archive, regardless of whether the zip file exists. Instances of the ZipFile class are not multi-thread safe. You may not party on a single instance with multiple threads. You may have multiple threads that each use a distinct ZipFile instance, or you can synchronize multi-thread access to a single instance. By the way, since DotNetZip is so easy to use, don't you think you should donate $5 or $10? Thrown if name refers to an existing file that is not a valid zip file. This example shows how to create a zipfile, and add a few files into it. String ZipFileToCreate = "archive1.zip"; String DirectoryToZip = "c:\\reports"; using (ZipFile zip = new ZipFile()) { // Store all files found in the top level directory, into the zip archive. String[] filenames = System.IO.Directory.GetFiles(DirectoryToZip); zip.AddFiles(filenames, "files"); zip.Save(ZipFileToCreate); } Dim ZipFileToCreate As String = "archive1.zip" Dim DirectoryToZip As String = "c:\reports" Using zip As ZipFile = New ZipFile() Dim filenames As String() = System.IO.Directory.GetFiles(DirectoryToZip) zip.AddFiles(filenames, "files") zip.Save(ZipFileToCreate) End Using The filename to use for the new zip archive. Creates a new ZipFile instance, using the specified name for the filename, and the specified Encoding. See the documentation on the ZipFile constructor that accepts a single string argument for basic information on all the ZipFile constructors. The Encoding is used as the default alternate encoding for entries with filenames or comments that cannot be encoded with the IBM437 code page. This is equivalent to setting the property on the ZipFile instance after construction. Instances of the ZipFile class are not multi-thread safe. You may not party on a single instance with multiple threads. You may have multiple threads that each use a distinct ZipFile instance, or you can synchronize multi-thread access to a single instance. Thrown if name refers to an existing file that is not a valid zip file. The filename to use for the new zip archive. The Encoding is used as the default alternate encoding for entries with filenames or comments that cannot be encoded with the IBM437 code page. Create a zip file, without specifying a target filename or stream to save to. See the documentation on the ZipFile constructor that accepts a single string argument for basic information on all the ZipFile constructors. After instantiating with this constructor and adding entries to the archive, the application should call or to save to a file or a stream, respectively. The application can also set the property and then call the no-argument method. (This is the preferred approach for applications that use the library through COM interop.) If you call the no-argument method without having set the Name of the ZipFile, either through the parameterized constructor or through the explicit property , the Save() will throw, because there is no place to save the file. Instances of the ZipFile class are not multi-thread safe. You may have multiple threads that each use a distinct ZipFile instance, or you can synchronize multi-thread access to a single instance. This example creates a Zip archive called Backup.zip, containing all the files in the directory DirectoryToZip. Files within subdirectories are not zipped up. using (ZipFile zip = new ZipFile()) { // Store all files found in the top level directory, into the zip archive. // note: this code does not recurse subdirectories! String[] filenames = System.IO.Directory.GetFiles(DirectoryToZip); zip.AddFiles(filenames, "files"); zip.Save("Backup.zip"); } Using zip As New ZipFile ' Store all files found in the top level directory, into the zip archive. ' note: this code does not recurse subdirectories! Dim filenames As String() = System.IO.Directory.GetFiles(DirectoryToZip) zip.AddFiles(filenames, "files") zip.Save("Backup.zip") End Using Create a zip file, specifying a text Encoding, but without specifying a target filename or stream to save to. See the documentation on the ZipFile constructor that accepts a single string argument for basic information on all the ZipFile constructors. The Encoding is used as the default alternate encoding for entries with filenames or comments that cannot be encoded with the IBM437 code page. Creates a new ZipFile instance, using the specified name for the filename, and the specified status message writer. See the documentation on the ZipFile constructor that accepts a single string argument for basic information on all the ZipFile constructors. This version of the constructor allows the caller to pass in a TextWriter, to which verbose messages will be written during extraction or creation of the zip archive. A console application may wish to pass System.Console.Out to get messages on the Console. A graphical or headless application may wish to capture the messages in a different TextWriter, for example, a StringWriter, and then display the messages in a TextBox, or generate an audit log of ZipFile operations. To encrypt the data for the files added to the ZipFile instance, set the Password property after creating the ZipFile instance. Instances of the ZipFile class are not multi-thread safe. You may not party on a single instance with multiple threads. You may have multiple threads that each use a distinct ZipFile instance, or you can synchronize multi-thread access to a single instance. Thrown if name refers to an existing file that is not a valid zip file. using (ZipFile zip = new ZipFile("Backup.zip", Console.Out)) { // Store all files found in the top level directory, into the zip archive. // note: this code does not recurse subdirectories! // Status messages will be written to Console.Out String[] filenames = System.IO.Directory.GetFiles(DirectoryToZip); zip.AddFiles(filenames); zip.Save(); } Using zip As New ZipFile("Backup.zip", Console.Out) ' Store all files found in the top level directory, into the zip archive. ' note: this code does not recurse subdirectories! ' Status messages will be written to Console.Out Dim filenames As String() = System.IO.Directory.GetFiles(DirectoryToZip) zip.AddFiles(filenames) zip.Save() End Using The filename to use for the new zip archive. A TextWriter to use for writing verbose status messages. Creates a new ZipFile instance, using the specified name for the filename, the specified status message writer, and the specified Encoding. This constructor works like the ZipFile constructor that accepts a single string argument. See that reference for detail on what this constructor does. This version of the constructor allows the caller to pass in a TextWriter, and an Encoding. The TextWriter will collect verbose messages that are generated by the library during extraction or creation of the zip archive. A console application may wish to pass System.Console.Out to get messages on the Console. A graphical or headless application may wish to capture the messages in a different TextWriter, for example, a StringWriter, and then display the messages in a TextBox, or generate an audit log of ZipFile operations. The Encoding is used as the default alternate encoding for entries with filenames or comments that cannot be encoded with the IBM437 code page. This is a equivalent to setting the property on the ZipFile instance after construction. To encrypt the data for the files added to the ZipFile instance, set the Password property after creating the ZipFile instance. Instances of the ZipFile class are not multi-thread safe. You may not party on a single instance with multiple threads. You may have multiple threads that each use a distinct ZipFile instance, or you can synchronize multi-thread access to a single instance. Thrown if fileName refers to an existing file that is not a valid zip file. The filename to use for the new zip archive. A TextWriter to use for writing verbose status messages. The Encoding is used as the default alternate encoding for entries with filenames or comments that cannot be encoded with the IBM437 code page. Initialize a ZipFile instance by reading in a zip file. This method is primarily useful from COM Automation environments, when reading or extracting zip files. In COM, it is not possible to invoke parameterized constructors for a class. A COM Automation application can update a zip file by using the default (no argument) constructor, then calling Initialize() to read the contents of an on-disk zip archive into the ZipFile instance. .NET applications are encouraged to use the ZipFile.Read() methods for better clarity. the name of the existing zip file to read in. This is an integer indexer into the Zip archive. This property is read-only. Internally, the ZipEntry instances that belong to the ZipFile are stored in a Dictionary. When you use this indexer the first time, it creates a read-only List<ZipEntry> from the Dictionary.Values Collection. If at any time you modify the set of entries in the ZipFile, either by adding an entry, removing an entry, or renaming an entry, a new List will be created, and the numeric indexes for the remaining entries may be different. This means you cannot rename any ZipEntry from inside an enumeration of the zip file. The index value. The ZipEntry within the Zip archive at the specified index. If the entry does not exist in the archive, this indexer throws. This is a name-based indexer into the Zip archive. This property is read-only. The property on the ZipFile determines whether retrieval via this indexer is done via case-sensitive comparisons. By default, retrieval is not case sensitive. This makes sense on Windows, in which filesystems are not case sensitive. Regardless of case-sensitivity, it is not always the case that this[value].FileName == value. In other words, the FileName property of the ZipEntry retrieved with this indexer, may or may not be equal to the index value. This is because DotNetZip performs a normalization of filenames passed to this indexer, before attempting to retrieve the item. That normalization includes: removal of a volume letter and colon, swapping backward slashes for forward slashes. So, zip["dir1\\entry1.txt"].FileName == "dir1/entry.txt". Directory entries in the zip file may be retrieved via this indexer only with names that have a trailing slash. DotNetZip automatically appends a trailing slash to the names of any directory entries added to a zip. This example extracts only the entries in a zip file that are .txt files. using (ZipFile zip = ZipFile.Read("PackedDocuments.zip")) { foreach (string s1 in zip.EntryFilenames) { if (s1.EndsWith(".txt")) zip[s1].Extract("textfiles"); } } Using zip As ZipFile = ZipFile.Read("PackedDocuments.zip") Dim s1 As String For Each s1 In zip.EntryFilenames If s1.EndsWith(".txt") Then zip(s1).Extract("textfiles") End If Next End Using Thrown if the caller attempts to assign a non-null value to the indexer. The name of the file, including any directory path, to retrieve from the zip. The filename match is not case-sensitive by default; you can use the property to change this behavior. The pathname can use forward-slashes or backward slashes. The ZipEntry within the Zip archive, given by the specified filename. If the named entry does not exist in the archive, this indexer returns null (Nothing in VB). The list of filenames for the entries contained within the zip archive. According to the ZIP specification, the names of the entries use forward slashes in pathnames. If you are scanning through the list, you may have to swap forward slashes for backslashes. This example shows one way to test if a filename is already contained within a zip archive. String zipFileToRead= "PackedDocuments.zip"; string candidate = "DatedMaterial.xps"; using (ZipFile zip = new ZipFile(zipFileToRead)) { if (zip.EntryFilenames.Contains(candidate)) Console.WriteLine("The file '{0}' exists in the zip archive '{1}'", candidate, zipFileName); else Console.WriteLine("The file, '{0}', does not exist in the zip archive '{1}'", candidate, zipFileName); Console.WriteLine(); } Dim zipFileToRead As String = "PackedDocuments.zip" Dim candidate As String = "DatedMaterial.xps" Using zip As ZipFile.Read(ZipFileToRead) If zip.EntryFilenames.Contains(candidate) Then Console.WriteLine("The file '{0}' exists in the zip archive '{1}'", _ candidate, _ zipFileName) Else Console.WriteLine("The file, '{0}', does not exist in the zip archive '{1}'", _ candidate, _ zipFileName) End If Console.WriteLine End Using The list of strings for the filenames contained within the Zip archive. Returns the readonly collection of entries in the Zip archive. If there are no entries in the current ZipFile, the value returned is a non-null zero-element collection. If there are entries in the zip file, the elements are returned in no particular order. This is the implied enumerator on the ZipFile class. If you use a ZipFile instance in a context that expects an enumerator, you will get this collection. Returns a readonly collection of entries in the Zip archive, sorted by FileName. If there are no entries in the current ZipFile, the value returned is a non-null zero-element collection. If there are entries in the zip file, the elements are returned sorted by the name of the entry. This example fills a Windows Forms ListView with the entries in a zip file. using (ZipFile zip = ZipFile.Read(zipFile)) { foreach (ZipEntry entry in zip.EntriesSorted) { ListViewItem item = new ListViewItem(n.ToString()); n++; string[] subitems = new string[] { entry.FileName.Replace("/","\\"), entry.LastModified.ToString("yyyy-MM-dd HH:mm:ss"), entry.UncompressedSize.ToString(), String.Format("{0,5:F0}%", entry.CompressionRatio), entry.CompressedSize.ToString(), (entry.UsesEncryption) ? "Y" : "N", String.Format("{0:X8}", entry.Crc)}; foreach (String s in subitems) { ListViewItem.ListViewSubItem subitem = new ListViewItem.ListViewSubItem(); subitem.Text = s; item.SubItems.Add(subitem); } this.listView1.Items.Add(item); } } Returns the number of entries in the Zip archive. Removes the given ZipEntry from the zip archive. After calling RemoveEntry, the application must call Save to make the changes permanent. Thrown if the specified ZipEntry does not exist in the ZipFile. In this example, all entries in the zip archive dating from before December 31st, 2007, are removed from the archive. This is actually much easier if you use the RemoveSelectedEntries method. But I needed an example for RemoveEntry, so here it is. String ZipFileToRead = "ArchiveToModify.zip"; System.DateTime Threshold = new System.DateTime(2007,12,31); using (ZipFile zip = ZipFile.Read(ZipFileToRead)) { var EntriesToRemove = new System.Collections.Generic.List<ZipEntry>(); foreach (ZipEntry e in zip) { if (e.LastModified < Threshold) { // We cannot remove the entry from the list, within the context of // an enumeration of said list. // So we add the doomed entry to a list to be removed later. EntriesToRemove.Add(e); } } // actually remove the doomed entries. foreach (ZipEntry zombie in EntriesToRemove) zip.RemoveEntry(zombie); zip.Comment= String.Format("This zip archive was updated at {0}.", System.DateTime.Now.ToString("G")); // save with a different name zip.Save("Archive-Updated.zip"); } Dim ZipFileToRead As String = "ArchiveToModify.zip" Dim Threshold As New DateTime(2007, 12, 31) Using zip As ZipFile = ZipFile.Read(ZipFileToRead) Dim EntriesToRemove As New System.Collections.Generic.List(Of ZipEntry) Dim e As ZipEntry For Each e In zip If (e.LastModified < Threshold) Then ' We cannot remove the entry from the list, within the context of ' an enumeration of said list. ' So we add the doomed entry to a list to be removed later. EntriesToRemove.Add(e) End If Next ' actually remove the doomed entries. Dim zombie As ZipEntry For Each zombie In EntriesToRemove zip.RemoveEntry(zombie) Next zip.Comment = String.Format("This zip archive was updated at {0}.", DateTime.Now.ToString("G")) 'save as a different name zip.Save("Archive-Updated.zip") End Using The ZipEntry to remove from the zip. Removes the ZipEntry with the given filename from the zip archive. After calling RemoveEntry, the application must call Save to make the changes permanent. Thrown if the ZipFile is not updatable. Thrown if a ZipEntry with the specified filename does not exist in the ZipFile. This example shows one way to remove an entry with a given filename from an existing zip archive. String zipFileToRead= "PackedDocuments.zip"; string candidate = "DatedMaterial.xps"; using (ZipFile zip = ZipFile.Read(zipFileToRead)) { if (zip.EntryFilenames.Contains(candidate)) { zip.RemoveEntry(candidate); zip.Comment= String.Format("The file '{0}' has been removed from this archive.", Candidate); zip.Save(); } } Dim zipFileToRead As String = "PackedDocuments.zip" Dim candidate As String = "DatedMaterial.xps" Using zip As ZipFile = ZipFile.Read(zipFileToRead) If zip.EntryFilenames.Contains(candidate) Then zip.RemoveEntry(candidate) zip.Comment = String.Format("The file '{0}' has been removed from this archive.", Candidate) zip.Save End If End Using The name of the file, including any directory path, to remove from the zip. The filename match is not case-sensitive by default; you can use the CaseSensitiveRetrieval property to change this behavior. The pathname can use forward-slashes or backward slashes. Closes the read and write streams associated to the ZipFile, if necessary. The Dispose() method is generally employed implicitly, via a using(..) {..} statement. (Using...End Using in VB) If you do not employ a using statement, insure that your application calls Dispose() explicitly. For example, in a Powershell application, or an application that uses the COM interop interface, you must call Dispose() explicitly. This example extracts an entry selected by name, from the Zip file to the Console. using (ZipFile zip = ZipFile.Read(zipfile)) { foreach (ZipEntry e in zip) { if (WantThisEntry(e.FileName)) zip.Extract(e.FileName, Console.OpenStandardOutput()); } } // Dispose() is called implicitly here. Using zip As ZipFile = ZipFile.Read(zipfile) Dim e As ZipEntry For Each e In zip If WantThisEntry(e.FileName) Then zip.Extract(e.FileName, Console.OpenStandardOutput()) End If Next End Using ' Dispose is implicity called here Disposes any managed resources, if the flag is set, then marks the instance disposed. This method is typically not called explicitly from application code. Applications should call the no-arg Dispose method. indicates whether the method should dispose streams or not. Default size of the buffer used for IO. An event handler invoked when a Save() starts, before and after each entry has been written to the archive, when a Save() completes, and during other Save events. Depending on the particular event, different properties on the parameter are set. The following table summarizes the available EventTypes and the conditions under which this event handler is invoked with a SaveProgressEventArgs with the given EventType. value of EntryType Meaning and conditions ZipProgressEventType.Saving_Started Fired when ZipFile.Save() begins. ZipProgressEventType.Saving_BeforeSaveEntry Fired within ZipFile.Save(), just before writing data for each particular entry. ZipProgressEventType.Saving_AfterSaveEntry Fired within ZipFile.Save(), just after having finished writing data for each particular entry. ZipProgressEventType.Saving_Completed Fired when ZipFile.Save() has completed. ZipProgressEventType.Saving_AfterSaveTempArchive Fired after the temporary file has been created. This happens only when saving to a disk file. This event will not be invoked when saving to a stream. ZipProgressEventType.Saving_BeforeRenameTempArchive Fired just before renaming the temporary file to the permanent location. This happens only when saving to a disk file. This event will not be invoked when saving to a stream. ZipProgressEventType.Saving_AfterRenameTempArchive Fired just after renaming the temporary file to the permanent location. This happens only when saving to a disk file. This event will not be invoked when saving to a stream. ZipProgressEventType.Saving_AfterCompileSelfExtractor Fired after a self-extracting archive has finished compiling. This EventType is used only within SaveSelfExtractor(). ZipProgressEventType.Saving_BytesRead Set during the save of a particular entry, to update progress of the Save(). When this EventType is set, the BytesTransferred is the number of bytes that have been read from the source stream. The TotalBytesToTransfer is the number of bytes in the uncompressed file. This example uses an anonymous method to handle the SaveProgress event, by updating a progress bar. progressBar1.Value = 0; progressBar1.Max = listbox1.Items.Count; using (ZipFile zip = new ZipFile()) { // listbox1 contains a list of filenames zip.AddFiles(listbox1.Items); // do the progress bar: zip.SaveProgress += (sender, e) => { if (e.EventType == ZipProgressEventType.Saving_BeforeWriteEntry) { progressBar1.PerformStep(); } }; zip.Save(fs); } This example uses a named method as the SaveProgress event handler, to update the user, in a console-based application. static bool justHadByteUpdate= false; public static void SaveProgress(object sender, SaveProgressEventArgs e) { if (e.EventType == ZipProgressEventType.Saving_Started) Console.WriteLine("Saving: {0}", e.ArchiveName); else if (e.EventType == ZipProgressEventType.Saving_Completed) { justHadByteUpdate= false; Console.WriteLine(); Console.WriteLine("Done: {0}", e.ArchiveName); } else if (e.EventType == ZipProgressEventType.Saving_BeforeWriteEntry) { if (justHadByteUpdate) Console.WriteLine(); Console.WriteLine(" Writing: {0} ({1}/{2})", e.CurrentEntry.FileName, e.EntriesSaved, e.EntriesTotal); justHadByteUpdate= false; } else if (e.EventType == ZipProgressEventType.Saving_EntryBytesRead) { if (justHadByteUpdate) Console.SetCursorPosition(0, Console.CursorTop); Console.Write(" {0}/{1} ({2:N0}%)", e.BytesTransferred, e.TotalBytesToTransfer, e.BytesTransferred / (0.01 * e.TotalBytesToTransfer )); justHadByteUpdate= true; } } public static ZipUp(string targetZip, string directory) { using (var zip = new ZipFile()) { zip.SaveProgress += SaveProgress; zip.AddDirectory(directory); zip.Save(targetZip); } } Public Sub ZipUp(ByVal targetZip As String, ByVal directory As String) Using zip As ZipFile = New ZipFile AddHandler zip.SaveProgress, AddressOf MySaveProgress zip.AddDirectory(directory) zip.Save(targetZip) End Using End Sub Private Shared justHadByteUpdate As Boolean = False Public Shared Sub MySaveProgress(ByVal sender As Object, ByVal e As SaveProgressEventArgs) If (e.EventType Is ZipProgressEventType.Saving_Started) Then Console.WriteLine("Saving: {0}", e.ArchiveName) ElseIf (e.EventType Is ZipProgressEventType.Saving_Completed) Then justHadByteUpdate = False Console.WriteLine Console.WriteLine("Done: {0}", e.ArchiveName) ElseIf (e.EventType Is ZipProgressEventType.Saving_BeforeWriteEntry) Then If justHadByteUpdate Then Console.WriteLine End If Console.WriteLine(" Writing: {0} ({1}/{2})", e.CurrentEntry.FileName, e.EntriesSaved, e.EntriesTotal) justHadByteUpdate = False ElseIf (e.EventType Is ZipProgressEventType.Saving_EntryBytesRead) Then If justHadByteUpdate Then Console.SetCursorPosition(0, Console.CursorTop) End If Console.Write(" {0}/{1} ({2:N0}%)", e.BytesTransferred, _ e.TotalBytesToTransfer, _ (CDbl(e.BytesTransferred) / (0.01 * e.TotalBytesToTransfer))) justHadByteUpdate = True End If End Sub This is a more complete example of using the SaveProgress events in a Windows Forms application, with a Thread object. delegate void SaveEntryProgress(SaveProgressEventArgs e); delegate void ButtonClick(object sender, EventArgs e); internal class WorkerOptions { public string ZipName; public string Folder; public string Encoding; public string Comment; public int ZipFlavor; public Zip64Option Zip64; } private int _progress2MaxFactor; private bool _saveCanceled; private long _totalBytesBeforeCompress; private long _totalBytesAfterCompress; private Thread _workerThread; private void btnZipup_Click(object sender, EventArgs e) { KickoffZipup(); } private void btnCancel_Click(object sender, EventArgs e) { if (this.lblStatus.InvokeRequired) { this.lblStatus.Invoke(new ButtonClick(this.btnCancel_Click), new object[] { sender, e }); } else { _saveCanceled = true; lblStatus.Text = "Canceled..."; ResetState(); } } private void KickoffZipup() { _folderName = tbDirName.Text; if (_folderName == null || _folderName == "") return; if (this.tbZipName.Text == null || this.tbZipName.Text == "") return; // check for existence of the zip file: if (System.IO.File.Exists(this.tbZipName.Text)) { var dlgResult = MessageBox.Show(String.Format("The file you have specified ({0}) already exists." + " Do you want to overwrite this file?", this.tbZipName.Text), "Confirmation is Required", MessageBoxButtons.YesNo, MessageBoxIcon.Question); if (dlgResult != DialogResult.Yes) return; System.IO.File.Delete(this.tbZipName.Text); } _saveCanceled = false; _nFilesCompleted = 0; _totalBytesAfterCompress = 0; _totalBytesBeforeCompress = 0; this.btnOk.Enabled = false; this.btnOk.Text = "Zipping..."; this.btnCancel.Enabled = true; lblStatus.Text = "Zipping..."; var options = new WorkerOptions { ZipName = this.tbZipName.Text, Folder = _folderName, Encoding = "ibm437" }; if (this.comboBox1.SelectedIndex != 0) { options.Encoding = this.comboBox1.SelectedItem.ToString(); } if (this.radioFlavorSfxCmd.Checked) options.ZipFlavor = 2; else if (this.radioFlavorSfxGui.Checked) options.ZipFlavor = 1; else options.ZipFlavor = 0; if (this.radioZip64AsNecessary.Checked) options.Zip64 = Zip64Option.AsNecessary; else if (this.radioZip64Always.Checked) options.Zip64 = Zip64Option.Always; else options.Zip64 = Zip64Option.Never; options.Comment = String.Format("Encoding:{0} || Flavor:{1} || ZIP64:{2}\r\nCreated at {3} || {4}\r\n", options.Encoding, FlavorToString(options.ZipFlavor), options.Zip64.ToString(), System.DateTime.Now.ToString("yyyy-MMM-dd HH:mm:ss"), this.Text); if (this.tbComment.Text != TB_COMMENT_NOTE) options.Comment += this.tbComment.Text; _workerThread = new Thread(this.DoSave); _workerThread.Name = "Zip Saver thread"; _workerThread.Start(options); this.Cursor = Cursors.WaitCursor; } private void DoSave(Object p) { WorkerOptions options = p as WorkerOptions; try { using (var zip1 = new ZipFile()) { zip1.ProvisionalAlternateEncoding = System.Text.Encoding.GetEncoding(options.Encoding); zip1.Comment = options.Comment; zip1.AddDirectory(options.Folder); _entriesToZip = zip1.EntryFileNames.Count; SetProgressBars(); zip1.SaveProgress += this.zip1_SaveProgress; zip1.UseZip64WhenSaving = options.Zip64; if (options.ZipFlavor == 1) zip1.SaveSelfExtractor(options.ZipName, SelfExtractorFlavor.WinFormsApplication); else if (options.ZipFlavor == 2) zip1.SaveSelfExtractor(options.ZipName, SelfExtractorFlavor.ConsoleApplication); else zip1.Save(options.ZipName); } } catch (System.Exception exc1) { MessageBox.Show(String.Format("Exception while zipping: {0}", exc1.Message)); btnCancel_Click(null, null); } } void zip1_SaveProgress(object sender, SaveProgressEventArgs e) { switch (e.EventType) { case ZipProgressEventType.Saving_AfterWriteEntry: StepArchiveProgress(e); break; case ZipProgressEventType.Saving_EntryBytesRead: StepEntryProgress(e); break; case ZipProgressEventType.Saving_Completed: SaveCompleted(); break; case ZipProgressEventType.Saving_AfterSaveTempArchive: // this event only occurs when saving an SFX file TempArchiveSaved(); break; } if (_saveCanceled) e.Cancel = true; } private void StepArchiveProgress(SaveProgressEventArgs e) { if (this.progressBar1.InvokeRequired) { this.progressBar1.Invoke(new SaveEntryProgress(this.StepArchiveProgress), new object[] { e }); } else { if (!_saveCanceled) { _nFilesCompleted++; this.progressBar1.PerformStep(); _totalBytesAfterCompress += e.CurrentEntry.CompressedSize; _totalBytesBeforeCompress += e.CurrentEntry.UncompressedSize; // reset the progress bar for the entry: this.progressBar2.Value = this.progressBar2.Maximum = 1; this.Update(); } } } private void StepEntryProgress(SaveProgressEventArgs e) { if (this.progressBar2.InvokeRequired) { this.progressBar2.Invoke(new SaveEntryProgress(this.StepEntryProgress), new object[] { e }); } else { if (!_saveCanceled) { if (this.progressBar2.Maximum == 1) { // reset Int64 max = e.TotalBytesToTransfer; _progress2MaxFactor = 0; while (max > System.Int32.MaxValue) { max /= 2; _progress2MaxFactor++; } this.progressBar2.Maximum = (int)max; lblStatus.Text = String.Format("{0} of {1} files...({2})", _nFilesCompleted + 1, _entriesToZip, e.CurrentEntry.FileName); } int xferred = e.BytesTransferred >> _progress2MaxFactor; this.progressBar2.Value = (xferred >= this.progressBar2.Maximum) ? this.progressBar2.Maximum : xferred; this.Update(); } } } private void SaveCompleted() { if (this.lblStatus.InvokeRequired) { this.lblStatus.Invoke(new MethodInvoker(this.SaveCompleted)); } else { lblStatus.Text = String.Format("Done, Compressed {0} files, {1:N0}% of original.", _nFilesCompleted, (100.00 * _totalBytesAfterCompress) / _totalBytesBeforeCompress); ResetState(); } } private void ResetState() { this.btnCancel.Enabled = false; this.btnOk.Enabled = true; this.btnOk.Text = "Zip it!"; this.progressBar1.Value = 0; this.progressBar2.Value = 0; this.Cursor = Cursors.Default; if (!_workerThread.IsAlive) _workerThread.Join(); } An event handler invoked before, during, and after the reading of a zip archive. Depending on the particular event being signaled, different properties on the parameter are set. The following table summarizes the available EventTypes and the conditions under which this event handler is invoked with a ReadProgressEventArgs with the given EventType. value of EntryType Meaning and conditions ZipProgressEventType.Reading_Started Fired just as ZipFile.Read() begins. Meaningful properties: ArchiveName. ZipProgressEventType.Reading_Completed Fired when ZipFile.Read() has completed. Meaningful properties: ArchiveName. ZipProgressEventType.Reading_ArchiveBytesRead Fired while reading, updates the number of bytes read for the entire archive. Meaningful properties: ArchiveName, CurrentEntry, BytesTransferred, TotalBytesToTransfer. ZipProgressEventType.Reading_BeforeReadEntry Indicates an entry is about to be read from the archive. Meaningful properties: ArchiveName, EntriesTotal. ZipProgressEventType.Reading_AfterReadEntry Indicates an entry has just been read from the archive. Meaningful properties: ArchiveName, EntriesTotal, CurrentEntry. An event handler invoked before, during, and after extraction of entries in the zip archive. Depending on the particular event, different properties on the parameter are set. The following table summarizes the available EventTypes and the conditions under which this event handler is invoked with a ExtractProgressEventArgs with the given EventType. value of EntryType Meaning and conditions ZipProgressEventType.Extracting_BeforeExtractAll Set when ExtractAll() begins. The ArchiveName, Overwrite, and ExtractLocation properties are meaningful. ZipProgressEventType.Extracting_AfterExtractAll Set when ExtractAll() has completed. The ArchiveName, Overwrite, and ExtractLocation properties are meaningful. ZipProgressEventType.Extracting_BeforeExtractEntry Set when an Extract() on an entry in the ZipFile has begun. Properties that are meaningful: ArchiveName, EntriesTotal, CurrentEntry, Overwrite, ExtractLocation, EntriesExtracted. ZipProgressEventType.Extracting_AfterExtractEntry Set when an Extract() on an entry in the ZipFile has completed. Properties that are meaningful: ArchiveName, EntriesTotal, CurrentEntry, Overwrite, ExtractLocation, EntriesExtracted. ZipProgressEventType.Extracting_EntryBytesWritten Set within a call to Extract() on an entry in the ZipFile, as data is extracted for the entry. Properties that are meaningful: ArchiveName, CurrentEntry, BytesTransferred, TotalBytesToTransfer. ZipProgressEventType.Extracting_ExtractEntryWouldOverwrite Set within a call to Extract() on an entry in the ZipFile, when the extraction would overwrite an existing file. This event type is used only when ExtractExistingFileAction on the ZipFile or ZipEntry is set to InvokeExtractProgressEvent. private static bool justHadByteUpdate = false; public static void ExtractProgress(object sender, ExtractProgressEventArgs e) { if(e.EventType == ZipProgressEventType.Extracting_EntryBytesWritten) { if (justHadByteUpdate) Console.SetCursorPosition(0, Console.CursorTop); Console.Write(" {0}/{1} ({2:N0}%)", e.BytesTransferred, e.TotalBytesToTransfer, e.BytesTransferred / (0.01 * e.TotalBytesToTransfer )); justHadByteUpdate = true; } else if(e.EventType == ZipProgressEventType.Extracting_BeforeExtractEntry) { if (justHadByteUpdate) Console.WriteLine(); Console.WriteLine("Extracting: {0}", e.CurrentEntry.FileName); justHadByteUpdate= false; } } public static ExtractZip(string zipToExtract, string directory) { string TargetDirectory= "extract"; using (var zip = ZipFile.Read(zipToExtract)) { zip.ExtractProgress += ExtractProgress; foreach (var e in zip1) { e.Extract(TargetDirectory, true); } } } Public Shared Sub Main(ByVal args As String()) Dim ZipToUnpack As String = "C1P3SML.zip" Dim TargetDir As String = "ExtractTest_Extract" Console.WriteLine("Extracting file {0} to {1}", ZipToUnpack, TargetDir) Using zip1 As ZipFile = ZipFile.Read(ZipToUnpack) AddHandler zip1.ExtractProgress, AddressOf MyExtractProgress Dim e As ZipEntry For Each e In zip1 e.Extract(TargetDir, True) Next End Using End Sub Private Shared justHadByteUpdate As Boolean = False Public Shared Sub MyExtractProgress(ByVal sender As Object, ByVal e As ExtractProgressEventArgs) If (e.EventType = ZipProgressEventType.Extracting_EntryBytesWritten) Then If ExtractTest.justHadByteUpdate Then Console.SetCursorPosition(0, Console.CursorTop) End If Console.Write(" {0}/{1} ({2:N0}%)", e.BytesTransferred, e.TotalBytesToTransfer, (CDbl(e.BytesTransferred) / (0.01 * e.TotalBytesToTransfer))) ExtractTest.justHadByteUpdate = True ElseIf (e.EventType = ZipProgressEventType.Extracting_BeforeExtractEntry) Then If ExtractTest.justHadByteUpdate Then Console.WriteLine End If Console.WriteLine("Extracting: {0}", e.CurrentEntry.FileName) ExtractTest.justHadByteUpdate = False End If End Sub An event handler invoked before, during, and after Adding entries to a zip archive. Adding a large number of entries to a zip file can take a long time. For example, when calling on a directory that contains 50,000 files, it could take 3 minutes or so. This event handler allws an application to track the progress of the Add operation, and to optionally cancel a lengthy Add operation. int _numEntriesToAdd= 0; int _numEntriesAdded= 0; void AddProgressHandler(object sender, AddProgressEventArgs e) { switch (e.EventType) { case ZipProgressEventType.Adding_Started: Console.WriteLine("Adding files to the zip..."); break; case ZipProgressEventType.Adding_AfterAddEntry: _numEntriesAdded++; Console.WriteLine(String.Format("Adding file {0}/{1} :: {2}", _numEntriesAdded, _numEntriesToAdd, e.CurrentEntry.FileName)); break; case ZipProgressEventType.Adding_Completed: Console.WriteLine("Added all files"); break; } } void CreateTheZip() { using (ZipFile zip = new ZipFile()) { zip.AddProgress += AddProgressHandler; zip.AddDirectory(System.IO.Path.GetFileName(DirToZip)); zip.Save(ZipFileToCreate); } } Private Sub AddProgressHandler(ByVal sender As Object, ByVal e As AddProgressEventArgs) Select Case e.EventType Case ZipProgressEventType.Adding_Started Console.WriteLine("Adding files to the zip...") Exit Select Case ZipProgressEventType.Adding_AfterAddEntry Console.WriteLine(String.Format("Adding file {0}", e.CurrentEntry.FileName)) Exit Select Case ZipProgressEventType.Adding_Completed Console.WriteLine("Added all files") Exit Select End Select End Sub Sub CreateTheZip() Using zip as ZipFile = New ZipFile AddHandler zip.AddProgress, AddressOf AddProgressHandler zip.AddDirectory(System.IO.Path.GetFileName(DirToZip)) zip.Save(ZipFileToCreate); End Using End Sub An event that is raised when an error occurs during open or read of files while saving a zip archive. Errors can occur as a file is being saved to the zip archive. For example, the File.Open may fail, or a File.Read may fail, because of lock conflicts or other reasons. If you add a handler to this event, you can handle such errors in your own code. If you don't add a handler, the library will throw an exception if it encounters an I/O error during a call to Save(). Setting a handler implicitly sets to ZipErrorAction.InvokeErrorEvent. The handler you add applies to all items that are subsequently added to the ZipFile instance. If you set this property after you have added items to the ZipFile, but before you have called Save(), errors that occur while saving those items will not cause the error handler to be invoked. If you want to handle any errors that occur with any entry in the zip file using the same error handler, then add your error handler once, before adding any entries to the zip archive. In the error handler method, you need to set the property on the ZipErrorEventArgs.CurrentEntry. This communicates back to DotNetZip what you would like to do with this particular error. Within an error handler, if you set the ZipEntry.ZipErrorAction property on the ZipEntry to ZipErrorAction.InvokeErrorEvent or if you don't set it at all, the library will throw the exception. (It is the same as if you had set the ZipEntry.ZipErrorAction property on the ZipEntry to ZipErrorAction.Throw.) If you set the ZipErrorEventArgs.Cancel to true, the entire Save() will be canceled. In the case that you use ZipErrorAction.Skip, implying that you want to skip the entry for which there's been an error, DotNetZip tries to seek backwards in the output stream, and truncate all bytes written on behalf of that particular entry. This works only if the output stream is seekable. It will not work, for example, when using ASPNET's Response.OutputStream. This example shows how to use an event handler to handle errors during save of the zip file. public static void MyZipError(object sender, ZipErrorEventArgs e) { Console.WriteLine("Error saving {0}...", e.FileName); Console.WriteLine(" Exception: {0}", e.exception); ZipEntry entry = e.CurrentEntry; string response = null; // Ask the user whether he wants to skip this error or not do { Console.Write("Retry, Skip, Throw, or Cancel ? (R/S/T/C) "); response = Console.ReadLine(); Console.WriteLine(); } while (response != null && response[0]!='S' && response[0]!='s' && response[0]!='R' && response[0]!='r' && response[0]!='T' && response[0]!='t' && response[0]!='C' && response[0]!='c'); e.Cancel = (response[0]=='C' || response[0]=='c'); if (response[0]=='S' || response[0]=='s') entry.ZipErrorAction = ZipErrorAction.Skip; else if (response[0]=='R' || response[0]=='r') entry.ZipErrorAction = ZipErrorAction.Retry; else if (response[0]=='T' || response[0]=='t') entry.ZipErrorAction = ZipErrorAction.Throw; } public void SaveTheFile() { string directoryToZip = "fodder"; string directoryInArchive = "files"; string zipFileToCreate = "Archive.zip"; using (var zip = new ZipFile()) { // set the event handler before adding any entries zip.ZipError += MyZipError; zip.AddDirectory(directoryToZip, directoryInArchive); zip.Save(zipFileToCreate); } } Private Sub MyZipError(ByVal sender As Object, ByVal e As Ionic.Zip.ZipErrorEventArgs) ' At this point, the application could prompt the user for an action to take. ' But in this case, this application will simply automatically skip the file, in case of error. Console.WriteLine("Zip Error, entry {0}", e.CurrentEntry.FileName) Console.WriteLine(" Exception: {0}", e.exception) ' set the desired ZipErrorAction on the CurrentEntry to communicate that to DotNetZip e.CurrentEntry.ZipErrorAction = Zip.ZipErrorAction.Skip End Sub Public Sub SaveTheFile() Dim directoryToZip As String = "fodder" Dim directoryInArchive As String = "files" Dim zipFileToCreate as String = "Archive.zip" Using zipArchive As ZipFile = New ZipFile ' set the event handler before adding any entries AddHandler zipArchive.ZipError, AddressOf MyZipError zipArchive.AddDirectory(directoryToZip, directoryInArchive) zipArchive.Save(zipFileToCreate) End Using End Sub Extracts all of the items in the zip archive, to the specified path in the filesystem. The path can be relative or fully-qualified. This method will extract all entries in the ZipFile to the specified path. If an extraction of a file from the zip archive would overwrite an existing file in the filesystem, the action taken is dictated by the ExtractExistingFile property, which overrides any setting you may have made on individual ZipEntry instances. By default, if you have not set that property on the ZipFile instance, the entry will not be extracted, the existing file will not be overwritten and an exception will be thrown. To change this, set the property, or use the overload that allows you to specify an ExtractExistingFileAction parameter. The action to take when an extract would overwrite an existing file applies to all entries. If you want to set this on a per-entry basis, then you must use one of the ZipEntry.Extract methods. This method will send verbose output messages to the , if it is set on the ZipFile instance. You may wish to take advantage of the ExtractProgress event. About timestamps: When extracting a file entry from a zip archive, the extracted file gets the last modified time of the entry as stored in the archive. The archive may also store extended file timestamp information, including last accessed and created times. If these are present in the ZipEntry, then the extracted file will also get these times. A Directory entry is somewhat different. It will get the times as described for a file entry, but, if there are file entries in the zip archive that, when extracted, appear in the just-created directory, then when those file entries are extracted, the last modified and last accessed times of the directory will change, as a side effect. The result is that after an extraction of a directory and a number of files within the directory, the last modified and last accessed timestamps on the directory will reflect the time that the last file was extracted into the directory, rather than the time stored in the zip archive for the directory. To compensate, when extracting an archive with ExtractAll, DotNetZip will extract all the file and directory entries as described above, but it will then make a second pass on the directories, and reset the times on the directories to reflect what is stored in the zip archive. This compensation is performed only within the context of an ExtractAll. If you call ZipEntry.Extract on a directory entry, the timestamps on directory in the filesystem will reflect the times stored in the zip. If you then call ZipEntry.Extract on a file entry, which is extracted into the directory, the timestamps on the directory will be updated to the current time. This example extracts all the entries in a zip archive file, to the specified target directory. The extraction will overwrite any existing files silently. String TargetDirectory= "unpack"; using(ZipFile zip= ZipFile.Read(ZipFileToExtract)) { zip.ExtractExistingFile= ExtractExistingFileAction.OverwriteSilently; zip.ExtractAll(TargetDirectory); } Dim TargetDirectory As String = "unpack" Using zip As ZipFile = ZipFile.Read(ZipFileToExtract) zip.ExtractExistingFile= ExtractExistingFileAction.OverwriteSilently zip.ExtractAll(TargetDirectory) End Using The path to which the contents of the zipfile will be extracted. The path can be relative or fully-qualified. Extracts all of the items in the zip archive, to the specified path in the filesystem, using the specified behavior when extraction would overwrite an existing file. This method will extract all entries in the ZipFile to the specified path. For an extraction that would overwrite an existing file, the behavior is dictated by , which overrides any setting you may have made on individual ZipEntry instances. The action to take when an extract would overwrite an existing file applies to all entries. If you want to set this on a per-entry basis, then you must use or one of the similar methods. Calling this method is equivalent to setting the property and then calling . This method will send verbose output messages to the , if it is set on the ZipFile instance. This example extracts all the entries in a zip archive file, to the specified target directory. It does not overwrite any existing files. String TargetDirectory= "c:\\unpack"; using(ZipFile zip= ZipFile.Read(ZipFileToExtract)) { zip.ExtractAll(TargetDirectory, ExtractExistingFileAction.DontOverwrite); } Dim TargetDirectory As String = "c:\unpack" Using zip As ZipFile = ZipFile.Read(ZipFileToExtract) zip.ExtractAll(TargetDirectory, ExtractExistingFileAction.DontOverwrite) End Using The path to which the contents of the zipfile will be extracted. The path can be relative or fully-qualified. The action to take if extraction would overwrite an existing file. Reads a zip file archive and returns the instance. The stream is read using the default System.Text.Encoding, which is the IBM437 codepage. Thrown if the ZipFile cannot be read. The implementation of this method relies on System.IO.File.OpenRead, which can throw a variety of exceptions, including specific exceptions if a file is not found, an unauthorized access exception, exceptions for poorly formatted filenames, and so on. The name of the zip archive to open. This can be a fully-qualified or relative pathname. . The instance read from the zip archive. Reads a zip file archive from the named filesystem file using the specified options. This version of the Read() method allows the caller to pass in a TextWriter an Encoding, via an instance of the ReadOptions class. The ZipFile is read in using the specified encoding for entries where UTF-8 encoding is not explicitly specified. This example shows how to read a zip file using the Big-5 Chinese code page (950), and extract each entry in the zip file, while sending status messages out to the Console. For this code to work as intended, the zipfile must have been created using the big5 code page (CP950). This is typical, for example, when using WinRar on a machine with CP950 set as the default code page. In that case, the names of entries within the Zip archive will be stored in that code page, and reading the zip archive must be done using that code page. If the application did not use the correct code page in ZipFile.Read(), then names of entries within the zip archive would not be correctly retrieved. string zipToExtract = "MyArchive.zip"; string extractDirectory = "extract"; var options = new ReadOptions { StatusMessageWriter = System.Console.Out, Encoding = System.Text.Encoding.GetEncoding(950) }; using (ZipFile zip = ZipFile.Read(zipToExtract, options)) { foreach (ZipEntry e in zip) { e.Extract(extractDirectory); } } Dim zipToExtract as String = "MyArchive.zip" Dim extractDirectory as String = "extract" Dim options as New ReadOptions options.Encoding = System.Text.Encoding.GetEncoding(950) options.StatusMessageWriter = System.Console.Out Using zip As ZipFile = ZipFile.Read(zipToExtract, options) Dim e As ZipEntry For Each e In zip e.Extract(extractDirectory) Next End Using This example shows how to read a zip file using the default code page, to remove entries that have a modified date before a given threshold, sending status messages out to a StringWriter. var options = new ReadOptions { StatusMessageWriter = new System.IO.StringWriter() }; using (ZipFile zip = ZipFile.Read("PackedDocuments.zip", options)) { var Threshold = new DateTime(2007,7,4); // We cannot remove the entry from the list, within the context of // an enumeration of said list. // So we add the doomed entry to a list to be removed later. // pass 1: mark the entries for removal var MarkedEntries = new System.Collections.Generic.List<ZipEntry>(); foreach (ZipEntry e in zip) { if (e.LastModified < Threshold) MarkedEntries.Add(e); } // pass 2: actually remove the entry. foreach (ZipEntry zombie in MarkedEntries) zip.RemoveEntry(zombie); zip.Comment = "This archive has been updated."; zip.Save(); } // can now use contents of sw, eg store in an audit log Dim options as New ReadOptions options.StatusMessageWriter = New System.IO.StringWriter Using zip As ZipFile = ZipFile.Read("PackedDocuments.zip", options) Dim Threshold As New DateTime(2007, 7, 4) ' We cannot remove the entry from the list, within the context of ' an enumeration of said list. ' So we add the doomed entry to a list to be removed later. ' pass 1: mark the entries for removal Dim MarkedEntries As New System.Collections.Generic.List(Of ZipEntry) Dim e As ZipEntry For Each e In zip If (e.LastModified < Threshold) Then MarkedEntries.Add(e) End If Next ' pass 2: actually remove the entry. Dim zombie As ZipEntry For Each zombie In MarkedEntries zip.RemoveEntry(zombie) Next zip.Comment = "This archive has been updated." zip.Save End Using ' can now use contents of sw, eg store in an audit log Thrown if the zipfile cannot be read. The implementation of this method relies on System.IO.File.OpenRead, which can throw a variety of exceptions, including specific exceptions if a file is not found, an unauthorized access exception, exceptions for poorly formatted filenames, and so on. The name of the zip archive to open. This can be a fully-qualified or relative pathname. The set of options to use when reading the zip file. The ZipFile instance read from the zip archive. Reads a zip file archive using the specified text encoding, the specified TextWriter for status messages, and the specified ReadProgress event handler, and returns the instance. The name of the zip archive to open. This can be a fully-qualified or relative pathname. An event handler for Read operations. The System.IO.TextWriter to use for writing verbose status messages during operations on the zip archive. A console application may wish to pass System.Console.Out to get messages on the Console. A graphical or headless application may wish to capture the messages in a different TextWriter, such as a System.IO.StringWriter. The System.Text.Encoding to use when reading in the zip archive. Be careful specifying the encoding. If the value you use here is not the same as the Encoding used when the zip archive was created (possibly by a different archiver) you will get unexpected results and possibly exceptions. The instance read from the zip archive. Reads a zip archive from a stream. When reading from a file, it's probably easier to just use ZipFile.Read(String, ReadOptions). This overload is useful when when the zip archive content is available from an already-open stream. The stream must be open and readable and seekable when calling this method. The stream is left open when the reading is completed. Using this overload, the stream is read using the default System.Text.Encoding, which is the IBM437 codepage. If you want to specify the encoding to use when reading the zipfile content, see ZipFile.Read(Stream, ReadOptions). This Reading of zip content begins at the current position in the stream. This means if you have a stream that concatenates regular data and zip data, if you position the open, readable stream at the start of the zip data, you will be able to read the zip archive using this constructor, or any of the ZipFile constructors that accept a as input. Some examples of where this might be useful: the zip content is concatenated at the end of a regular EXE file, as some self-extracting archives do. (Note: SFX files produced by DotNetZip do not work this way; they can be read as normal ZIP files). Another example might be a stream being read from a database, where the zip content is embedded within an aggregate stream of data. This example shows how to Read zip content from a stream, and extract one entry into a different stream. In this example, the filename "NameOfEntryInArchive.doc", refers only to the name of the entry within the zip archive. A file by that name is not created in the filesystem. The I/O is done strictly with the given streams. using (ZipFile zip = ZipFile.Read(InputStream)) { zip.Extract("NameOfEntryInArchive.doc", OutputStream); } Using zip as ZipFile = ZipFile.Read(InputStream) zip.Extract("NameOfEntryInArchive.doc", OutputStream) End Using the stream containing the zip data. The ZipFile instance read from the stream Reads a zip file archive from the given stream using the specified options. When reading from a file, it's probably easier to just use ZipFile.Read(String, ReadOptions). This overload is useful when when the zip archive content is available from an already-open stream. The stream must be open and readable and seekable when calling this method. The stream is left open when the reading is completed. Reading of zip content begins at the current position in the stream. This means if you have a stream that concatenates regular data and zip data, if you position the open, readable stream at the start of the zip data, you will be able to read the zip archive using this constructor, or any of the ZipFile constructors that accept a as input. Some examples of where this might be useful: the zip content is concatenated at the end of a regular EXE file, as some self-extracting archives do. (Note: SFX files produced by DotNetZip do not work this way; they can be read as normal ZIP files). Another example might be a stream being read from a database, where the zip content is embedded within an aggregate stream of data. the stream containing the zip data. The set of options to use when reading the zip file. Thrown if the zip archive cannot be read. The ZipFile instance read from the stream. Reads a zip archive from a stream, using the specified text Encoding, the specified TextWriter for status messages, and the specified ReadProgress event handler. Reading of zip content begins at the current position in the stream. This means if you have a stream that concatenates regular data and zip data, if you position the open, readable stream at the start of the zip data, you will be able to read the zip archive using this constructor, or any of the ZipFile constructors that accept a as input. Some examples of where this might be useful: the zip content is concatenated at the end of a regular EXE file, as some self-extracting archives do. (Note: SFX files produced by DotNetZip do not work this way). Another example might be a stream being read from a database, where the zip content is embedded within an aggregate stream of data. the stream containing the zip data. The System.IO.TextWriter to which verbose status messages are written during operations on the ZipFile. For example, in a console application, System.Console.Out works, and will get a message for each entry added to the ZipFile. If the TextWriter is null, no verbose messages are written. The text encoding to use when reading entries that do not have the UTF-8 encoding bit set. Be careful specifying the encoding. If the value you use here is not the same as the Encoding used when the zip archive was created (possibly by a different archiver) you will get unexpected results and possibly exceptions. See the property for more information. An event handler for Read operations. an instance of ZipFile Checks the given file to see if it appears to be a valid zip file. Calling this method is equivalent to calling with the testExtract parameter set to false. The file to check. true if the file appears to be a zip file. Checks a file to see if it is a valid zip file. This method opens the specified zip file, reads in the zip archive, verifying the ZIP metadata as it reads. If everything succeeds, then the method returns true. If anything fails - for example if an incorrect signature or CRC is found, indicating a corrupt file, the the method returns false. This method also returns false for a file that does not exist. If is true, as part of its check, this method reads in the content for each entry, expands it, and checks CRCs. This provides an additional check beyond verifying the zip header and directory data. If is true, and if any of the zip entries are protected with a password, this method will return false. If you want to verify a ZipFile that has entries which are protected with a password, you will need to do that manually. The zip file to check. true if the caller wants to extract each entry. true if the file contains a valid zip file. Checks a stream to see if it contains a valid zip archive. This method reads the zip archive contained in the specified stream, verifying the ZIP metadata as it reads. If testExtract is true, this method also extracts each entry in the archive, dumping all the bits into . If everything succeeds, then the method returns true. If anything fails - for example if an incorrect signature or CRC is found, indicating a corrupt file, the the method returns false. This method also returns false for a file that does not exist. If testExtract is true, this method reads in the content for each entry, expands it, and checks CRCs. This provides an additional check beyond verifying the zip header data. If testExtract is true, and if any of the zip entries are protected with a password, this method will return false. If you want to verify a ZipFile that has entries which are protected with a password, you will need to do that manually. The stream to check. true if the caller wants to extract each entry. true if the stream contains a valid zip archive. Delete file with retry on UnauthorizedAccessException. When calling File.Delete() on a file that has been "recently" created, the call sometimes fails with UnauthorizedAccessException. This method simply retries the Delete 3 times with a sleep between tries. the name of the file to be deleted Saves the Zip archive to a file, specified by the Name property of the ZipFile. The ZipFile instance is written to storage, typically a zip file in a filesystem, only when the caller calls Save. In the typical case, the Save operation writes the zip content to a temporary file, and then renames the temporary file to the desired name. If necessary, this method will delete a pre-existing file before the rename. The property is specified either explicitly, or implicitly using one of the parameterized ZipFile constructors. For COM Automation clients, the Name property must be set explicitly, because COM Automation clients cannot call parameterized constructors. When using a filesystem file for the Zip output, it is possible to call Save multiple times on the ZipFile instance. With each call the zip content is re-written to the same output file. Data for entries that have been added to the ZipFile instance is written to the output when the Save method is called. This means that the input streams for those entries must be available at the time the application calls Save. If, for example, the application adds entries with AddEntry using a dynamically-allocated MemoryStream, the memory stream must not have been disposed before the call to Save. See the property for more discussion of the availability requirements of the input stream for an entry, and an approach for providing just-in-time stream lifecycle management. Thrown if you haven't specified a location or stream for saving the zip, either in the constructor or by setting the Name property, or if you try to save a regular zip archive to a filename with a .exe extension. Thrown if is non-zero, and the number of segments that would be generated for the spanned zip file during the save operation exceeds 99. If this happens, you need to increase the segment size. Save the file to a new zipfile, with the given name. This method allows the application to explicitly specify the name of the zip file when saving. Use this when creating a new zip file, or when updating a zip archive. An application can also save a zip archive in several places by calling this method multiple times in succession, with different filenames. The ZipFile instance is written to storage, typically a zip file in a filesystem, only when the caller calls Save. The Save operation writes the zip content to a temporary file, and then renames the temporary file to the desired name. If necessary, this method will delete a pre-existing file before the rename. Thrown if you specify a directory for the filename. The name of the zip archive to save to. Existing files will be overwritten with great prejudice. This example shows how to create and Save a zip file. using (ZipFile zip = new ZipFile()) { zip.AddDirectory(@"c:\reports\January"); zip.Save("January.zip"); } Using zip As New ZipFile() zip.AddDirectory("c:\reports\January") zip.Save("January.zip") End Using This example shows how to update a zip file. using (ZipFile zip = ZipFile.Read("ExistingArchive.zip")) { zip.AddFile("NewData.csv"); zip.Save("UpdatedArchive.zip"); } Using zip As ZipFile = ZipFile.Read("ExistingArchive.zip") zip.AddFile("NewData.csv") zip.Save("UpdatedArchive.zip") End Using Save the zip archive to the specified stream. The ZipFile instance is written to storage - typically a zip file in a filesystem, but using this overload, the storage can be anything accessible via a writable stream - only when the caller calls Save. Use this method to save the zip content to a stream directly. A common scenario is an ASP.NET application that dynamically generates a zip file and allows the browser to download it. The application can call Save(Response.OutputStream) to write a zipfile directly to the output stream, without creating a zip file on the disk on the ASP.NET server. Be careful when saving a file to a non-seekable stream, including Response.OutputStream. When DotNetZip writes to a non-seekable stream, the zip archive is formatted in such a way that may not be compatible with all zip tools on all platforms. It's a perfectly legal and compliant zip file, but some people have reported problems opening files produced this way using the Mac OS archive utility. This example saves the zipfile content into a MemoryStream, and then gets the array of bytes from that MemoryStream. using (var zip = new Ionic.Zip.ZipFile()) { zip.CompressionLevel= Ionic.Zlib.CompressionLevel.BestCompression; zip.Password = "VerySecret."; zip.Encryption = EncryptionAlgorithm.WinZipAes128; zip.AddFile(sourceFileName); MemoryStream output = new MemoryStream(); zip.Save(output); byte[] zipbytes = output.ToArray(); } This example shows a pitfall you should avoid. DO NOT read from a stream, then try to save to the same stream. DO NOT DO THIS: using (var fs = new FileSteeam(filename, FileMode.Open)) { using (var zip = Ionic.Zip.ZipFile.Read(inputStream)) { zip.AddEntry("Name1.txt", "this is the content"); zip.Save(inputStream); // NO NO NO!! } } Better like this: using (var zip = Ionic.Zip.ZipFile.Read(filename)) { zip.AddEntry("Name1.txt", "this is the content"); zip.Save(); // YES! } The System.IO.Stream to write to. It must be writable. If you created the ZipFile instanct by calling ZipFile.Read(), this stream must not be the same stream you passed to ZipFile.Read(). Saves the ZipFile instance to a self-extracting zip archive. The generated exe image will execute on any machine that has the .NET Framework 2.0 installed on it. The generated exe image is also a valid ZIP file, readable with DotNetZip or another Zip library or tool such as WinZip. There are two "flavors" of self-extracting archive. The WinFormsApplication version will pop up a GUI and allow the user to select a target directory into which to extract. There's also a checkbox allowing the user to specify to overwrite existing files, and another checkbox to allow the user to request that Explorer be opened to see the extracted files after extraction. The other flavor is ConsoleApplication. A self-extractor generated with that flavor setting will run from the command line. It accepts command-line options to set the overwrite behavior, and to specify the target extraction directory. There are a few temporary files created during the saving to a self-extracting zip. These files are created in the directory pointed to by , which defaults to . These temporary files are removed upon successful completion of this method. When a user runs the WinForms SFX, the user's personal directory (Environment.SpecialFolder.Personal) will be used as the default extract location. If you want to set the default extract location, you should use the other overload of SaveSelfExtractor()/ The user who runs the SFX will have the opportunity to change the extract directory before extracting. When the user runs the Command-Line SFX, the user must explicitly specify the directory to which to extract. The .NET Framework 2.0 is required on the computer when the self-extracting archive is run. NB: This method is not available in the version of DotNetZip build for the .NET Compact Framework, nor in the "Reduced" DotNetZip library. string DirectoryPath = "c:\\Documents\\Project7"; using (ZipFile zip = new ZipFile()) { zip.AddDirectory(DirectoryPath, System.IO.Path.GetFileName(DirectoryPath)); zip.Comment = "This will be embedded into a self-extracting console-based exe"; zip.SaveSelfExtractor("archive.exe", SelfExtractorFlavor.ConsoleApplication); } Dim DirectoryPath As String = "c:\Documents\Project7" Using zip As New ZipFile() zip.AddDirectory(DirectoryPath, System.IO.Path.GetFileName(DirectoryPath)) zip.Comment = "This will be embedded into a self-extracting console-based exe" zip.SaveSelfExtractor("archive.exe", SelfExtractorFlavor.ConsoleApplication) End Using a pathname, possibly fully qualified, to be created. Typically it will end in an .exe extension. Indicates whether a Winforms or Console self-extractor is desired. Saves the ZipFile instance to a self-extracting zip archive, using the specified save options. This method saves a self extracting archive, using the specified save options. These options include the flavor of the SFX, the default extract directory, the icon file, and so on. See the documentation for for more details. The user who runs the SFX will have the opportunity to change the extract directory before extracting. If at the time of extraction, the specified directory does not exist, the SFX will create the directory before extracting the files. This example saves a WinForms-based self-extracting archive EXE that will use c:\ExtractHere as the default extract location. The C# code shows syntax for .NET 3.0, which uses an object initializer for the SelfExtractorOptions object. string DirectoryPath = "c:\\Documents\\Project7"; using (ZipFile zip = new ZipFile()) { zip.AddDirectory(DirectoryPath, System.IO.Path.GetFileName(DirectoryPath)); zip.Comment = "This will be embedded into a self-extracting WinForms-based exe"; var options = new SelfExtractorOptions { Flavor = SelfExtractorFlavor.WinFormsApplication, DefaultExtractDirectory = "%USERPROFILE%\\ExtractHere", PostExtractCommandLine = ExeToRunAfterExtract, SfxExeWindowTitle = "My Custom Window Title", RemoveUnpackedFilesAfterExecute = true }; zip.SaveSelfExtractor("archive.exe", options); } Dim DirectoryPath As String = "c:\Documents\Project7" Using zip As New ZipFile() zip.AddDirectory(DirectoryPath, System.IO.Path.GetFileName(DirectoryPath)) zip.Comment = "This will be embedded into a self-extracting console-based exe" Dim options As New SelfExtractorOptions() options.Flavor = SelfExtractorFlavor.WinFormsApplication options.DefaultExtractDirectory = "%USERPROFILE%\\ExtractHere" options.PostExtractCommandLine = ExeToRunAfterExtract options.SfxExeWindowTitle = "My Custom Window Title" options.RemoveUnpackedFilesAfterExecute = True zip.SaveSelfExtractor("archive.exe", options) End Using The name of the EXE to generate. provides the options for creating the Self-extracting archive. Adds to the ZipFile a set of files from the current working directory on disk, that conform to the specified criteria. This method selects files from the the current working directory matching the specified criteria, and adds them to the ZipFile. Specify the criteria in statements of 3 elements: a noun, an operator, and a value. Consider the string "name != *.doc" . The noun is "name". The operator is "!=", implying "Not Equal". The value is "*.doc". That criterion, in English, says "all files with a name that does not end in the .doc extension." Supported nouns include "name" (or "filename") for the filename; "atime", "mtime", and "ctime" for last access time, last modfied time, and created time of the file, respectively; "attributes" (or "attrs") for the file attributes; "size" (or "length") for the file length (uncompressed), and "type" for the type of object, either a file or a directory. The "attributes", "name" and "type" nouns both support = and != as operators. The "size", "atime", "mtime", and "ctime" nouns support = and !=, and >, >=, <, <= as well. The times are taken to be expressed in local time. Specify values for the file attributes as a string with one or more of the characters H,R,S,A,I,L in any order, implying file attributes of Hidden, ReadOnly, System, Archive, NotContextIndexed, and ReparsePoint (symbolic link) respectively. To specify a time, use YYYY-MM-DD-HH:mm:ss or YYYY/MM/DD-HH:mm:ss as the format. If you omit the HH:mm:ss portion, it is assumed to be 00:00:00 (midnight). The value for a size criterion is expressed in integer quantities of bytes, kilobytes (use k or kb after the number), megabytes (m or mb), or gigabytes (g or gb). The value for a name is a pattern to match against the filename, potentially including wildcards. The pattern follows CMD.exe glob rules: * implies one or more of any character, while ? implies one character. If the name pattern contains any slashes, it is matched to the entire filename, including the path; otherwise, it is matched against only the filename without the path. This means a pattern of "*\*.*" matches all files one directory level deep, while a pattern of "*.*" matches all files in all directories. To specify a name pattern that includes spaces, use single quotes around the pattern. A pattern of "'* *.*'" will match all files that have spaces in the filename. The full criteria string for that would be "name = '* *.*'" . The value for a type criterion is either F (implying a file) or D (implying a directory). Some examples: criteria Files retrieved name != *.xls any file with an extension that is not .xls name = *.mp3 any file with a .mp3 extension. *.mp3 (same as above) any file with a .mp3 extension. attributes = A all files whose attributes include the Archive bit. attributes != H all files whose attributes do not include the Hidden bit. mtime > 2009-01-01 all files with a last modified time after January 1st, 2009. size > 2gb all files whose uncompressed size is greater than 2gb. type = D all directories in the filesystem. You can combine criteria with the conjunctions AND or OR. Using a string like "name = *.txt AND size >= 100k" for the selectionCriteria retrieves entries whose names end in .txt, and whose uncompressed size is greater than or equal to 100 kilobytes. For more complex combinations of criteria, you can use parenthesis to group clauses in the boolean logic. Without parenthesis, the precedence of the criterion atoms is determined by order of appearance. Unlike the C# language, the AND conjunction does not take precendence over the logical OR. This is important only in strings that contain 3 or more criterion atoms. In other words, "name = *.txt and size > 1000 or attributes = H" implies "((name = *.txt AND size > 1000) OR attributes = H)" while "attributes = H OR name = *.txt and size > 1000" evaluates to "((attributes = H OR name = *.txt) AND size > 1000)". When in doubt, use parenthesis. Using time properties requires some extra care. If you want to retrieve all entries that were last updated on 2009 February 14, specify a time range like so:"mtime >= 2009-02-14 AND mtime < 2009-02-15". Read this to say: all files updated after 12:00am on February 14th, until 12:00am on February 15th. You can use the same bracketing approach to specify any time period - a year, a month, a week, and so on. The syntax allows one special case: if you provide a string with no spaces, it is treated as a pattern to match for the filename. Therefore a string like "*.xls" will be equivalent to specifying "name = *.xls". There is no logic in this method that insures that the file inclusion criteria are internally consistent. For example, it's possible to specify criteria that says the file must have a size of less than 100 bytes, as well as a size that is greater than 1000 bytes. Obviously no file will ever satisfy such criteria, but this method does not detect such logical inconsistencies. The caller is responsible for insuring the criteria are sensible. Using this method, the file selection does not recurse into subdirectories, and the full path of the selected files is included in the entries added into the zip archive. If you don't like these behaviors, see the other overloads of this method. This example zips up all *.csv files in the current working directory. using (ZipFile zip = new ZipFile()) { // To just match on filename wildcards, // use the shorthand form of the selectionCriteria string. zip.AddSelectedFiles("*.csv"); zip.Save(PathToZipArchive); } Using zip As ZipFile = New ZipFile() zip.AddSelectedFiles("*.csv") zip.Save(PathToZipArchive) End Using The criteria for file selection Adds to the ZipFile a set of files from the disk that conform to the specified criteria, optionally recursing into subdirectories. This method selects files from the the current working directory matching the specified criteria, and adds them to the ZipFile. If recurseDirectories is true, files are also selected from subdirectories, and the directory structure in the filesystem is reproduced in the zip archive, rooted at the current working directory. Using this method, the full path of the selected files is included in the entries added into the zip archive. If you don't want this behavior, use one of the overloads of this method that allows the specification of a directoryInArchive. For details on the syntax for the selectionCriteria parameter, see . This example zips up all *.xml files in the current working directory, or any subdirectory, that are larger than 1mb. using (ZipFile zip = new ZipFile()) { // Use a compound expression in the selectionCriteria string. zip.AddSelectedFiles("name = *.xml and size > 1024kb", true); zip.Save(PathToZipArchive); } Using zip As ZipFile = New ZipFile() ' Use a compound expression in the selectionCriteria string. zip.AddSelectedFiles("name = *.xml and size > 1024kb", true) zip.Save(PathToZipArchive) End Using The criteria for file selection If true, the file selection will recurse into subdirectories. Adds to the ZipFile a set of files from a specified directory in the filesystem, that conform to the specified criteria. This method selects files that conform to the specified criteria, from the the specified directory on disk, and adds them to the ZipFile. The search does not recurse into subdirectores. Using this method, the full filesystem path of the files on disk is reproduced on the entries added to the zip file. If you don't want this behavior, use one of the other overloads of this method. For details on the syntax for the selectionCriteria parameter, see . This example zips up all *.xml files larger than 1mb in the directory given by "d:\rawdata". using (ZipFile zip = new ZipFile()) { // Use a compound expression in the selectionCriteria string. zip.AddSelectedFiles("name = *.xml and size > 1024kb", "d:\\rawdata"); zip.Save(PathToZipArchive); } Using zip As ZipFile = New ZipFile() ' Use a compound expression in the selectionCriteria string. zip.AddSelectedFiles("name = *.xml and size > 1024kb", "d:\rawdata) zip.Save(PathToZipArchive) End Using The criteria for file selection The name of the directory on the disk from which to select files. Adds to the ZipFile a set of files from the specified directory on disk, that conform to the specified criteria. This method selects files from the the specified disk directory matching the specified selection criteria, and adds them to the ZipFile. If recurseDirectories is true, files are also selected from subdirectories. The full directory structure in the filesystem is reproduced on the entries added to the zip archive. If you don't want this behavior, use one of the overloads of this method that allows the specification of a directoryInArchive. For details on the syntax for the selectionCriteria parameter, see . This example zips up all *.csv files in the "files" directory, or any subdirectory, that have been saved since 2009 February 14th. using (ZipFile zip = new ZipFile()) { // Use a compound expression in the selectionCriteria string. zip.AddSelectedFiles("name = *.csv and mtime > 2009-02-14", "files", true); zip.Save(PathToZipArchive); } Using zip As ZipFile = New ZipFile() ' Use a compound expression in the selectionCriteria string. zip.AddSelectedFiles("name = *.csv and mtime > 2009-02-14", "files", true) zip.Save(PathToZipArchive) End Using This example zips up all files in the current working directory, and all its child directories, except those in the excludethis subdirectory. Using Zip As ZipFile = New ZipFile(zipfile) Zip.AddSelectedFfiles("name != 'excludethis\*.*'", datapath, True) Zip.Save() End Using The criteria for file selection The filesystem path from which to select files. If true, the file selection will recurse into subdirectories. Adds to the ZipFile a selection of files from the specified directory on disk, that conform to the specified criteria, and using a specified root path for entries added to the zip archive. This method selects files from the specified disk directory matching the specified selection criteria, and adds those files to the ZipFile, using the specified directory path in the archive. The search does not recurse into subdirectories. For details on the syntax for the selectionCriteria parameter, see . This example zips up all *.psd files in the "photos" directory that have been saved since 2009 February 14th, and puts them all in a zip file, using the directory name of "content" in the zip archive itself. When the zip archive is unzipped, the folder containing the .psd files will be named "content". using (ZipFile zip = new ZipFile()) { // Use a compound expression in the selectionCriteria string. zip.AddSelectedFiles("name = *.psd and mtime > 2009-02-14", "photos", "content"); zip.Save(PathToZipArchive); } Using zip As ZipFile = New ZipFile zip.AddSelectedFiles("name = *.psd and mtime > 2009-02-14", "photos", "content") zip.Save(PathToZipArchive) End Using The criteria for selection of files to add to the ZipFile. The path to the directory in the filesystem from which to select files. Specifies a directory path to use to in place of the directoryOnDisk. This path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (nothing in VB) will use the path on the file name, if any; in other words it would use directoryOnDisk, plus any subdirectory. Passing the empty string ("") will insert the item at the root path within the archive. Adds to the ZipFile a selection of files from the specified directory on disk, that conform to the specified criteria, optionally recursing through subdirectories, and using a specified root path for entries added to the zip archive. This method selects files from the specified disk directory that match the specified selection criteria, and adds those files to the ZipFile, using the specified directory path in the archive. If recurseDirectories is true, files are also selected from subdirectories, and the directory structure in the filesystem is reproduced in the zip archive, rooted at the directory specified by directoryOnDisk. For details on the syntax for the selectionCriteria parameter, see . This example zips up all files that are NOT *.pst files, in the current working directory and any subdirectories. using (ZipFile zip = new ZipFile()) { zip.AddSelectedFiles("name != *.pst", SourceDirectory, "backup", true); zip.Save(PathToZipArchive); } Using zip As ZipFile = New ZipFile zip.AddSelectedFiles("name != *.pst", SourceDirectory, "backup", true) zip.Save(PathToZipArchive) End Using The criteria for selection of files to add to the ZipFile. The path to the directory in the filesystem from which to select files. Specifies a directory path to use to in place of the directoryOnDisk. This path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (nothing in VB) will use the path on the file name, if any; in other words it would use directoryOnDisk, plus any subdirectory. Passing the empty string ("") will insert the item at the root path within the archive. If true, the method also scans subdirectories for files matching the criteria. Updates the ZipFile with a selection of files from the disk that conform to the specified criteria. This method selects files from the specified disk directory that match the specified selection criteria, and Updates the ZipFile with those files, using the specified directory path in the archive. If recurseDirectories is true, files are also selected from subdirectories, and the directory structure in the filesystem is reproduced in the zip archive, rooted at the directory specified by directoryOnDisk. For details on the syntax for the selectionCriteria parameter, see . The criteria for selection of files to add to the ZipFile. The path to the directory in the filesystem from which to select files. Specifies a directory path to use to in place of the directoryOnDisk. This path may, or may not, correspond to a real directory in the current filesystem. If the files within the zip are later extracted, this is the path used for the extracted file. Passing null (nothing in VB) will use the path on the file name, if any; in other words it would use directoryOnDisk, plus any subdirectory. Passing the empty string ("") will insert the item at the root path within the archive. If true, the method also scans subdirectories for files matching the criteria. Retrieve entries from the zipfile by specified criteria. This method allows callers to retrieve the collection of entries from the zipfile that fit the specified criteria. The criteria are described in a string format, and can include patterns for the filename; constraints on the size of the entry; constraints on the last modified, created, or last accessed time for the file described by the entry; or the attributes of the entry. For details on the syntax for the selectionCriteria parameter, see . This method is intended for use with a ZipFile that has been read from storage. When creating a new ZipFile, this method will work only after the ZipArchive has been Saved to the disk (the ZipFile class subsequently and implicitly reads the Zip archive from storage.) Calling SelectEntries on a ZipFile that has not yet been saved will deliver undefined results. Thrown if selectionCriteria has an invalid syntax. This example selects all the PhotoShop files from within an archive, and extracts them to the current working directory. using (ZipFile zip1 = ZipFile.Read(ZipFileName)) { var PhotoShopFiles = zip1.SelectEntries("*.psd"); foreach (ZipEntry psd in PhotoShopFiles) { psd.Extract(); } } Using zip1 As ZipFile = ZipFile.Read(ZipFileName) Dim PhotoShopFiles as ICollection(Of ZipEntry) PhotoShopFiles = zip1.SelectEntries("*.psd") Dim psd As ZipEntry For Each psd In PhotoShopFiles psd.Extract Next End Using the string that specifies which entries to select a collection of ZipEntry objects that conform to the inclusion spec Retrieve entries from the zipfile by specified criteria. This method allows callers to retrieve the collection of entries from the zipfile that fit the specified criteria. The criteria are described in a string format, and can include patterns for the filename; constraints on the size of the entry; constraints on the last modified, created, or last accessed time for the file described by the entry; or the attributes of the entry. For details on the syntax for the selectionCriteria parameter, see . This method is intended for use with a ZipFile that has been read from storage. When creating a new ZipFile, this method will work only after the ZipArchive has been Saved to the disk (the ZipFile class subsequently and implicitly reads the Zip archive from storage.) Calling SelectEntries on a ZipFile that has not yet been saved will deliver undefined results. Thrown if selectionCriteria has an invalid syntax. using (ZipFile zip1 = ZipFile.Read(ZipFileName)) { var UpdatedPhotoShopFiles = zip1.SelectEntries("*.psd", "UpdatedFiles"); foreach (ZipEntry e in UpdatedPhotoShopFiles) { // prompt for extract here if (WantExtract(e.FileName)) e.Extract(); } } Using zip1 As ZipFile = ZipFile.Read(ZipFileName) Dim UpdatedPhotoShopFiles As ICollection(Of ZipEntry) = zip1.SelectEntries("*.psd", "UpdatedFiles") Dim e As ZipEntry For Each e In UpdatedPhotoShopFiles ' prompt for extract here If Me.WantExtract(e.FileName) Then e.Extract End If Next End Using the string that specifies which entries to select the directory in the archive from which to select entries. If null, then all directories in the archive are used. a collection of ZipEntry objects that conform to the inclusion spec Remove entries from the zipfile by specified criteria. This method allows callers to remove the collection of entries from the zipfile that fit the specified criteria. The criteria are described in a string format, and can include patterns for the filename; constraints on the size of the entry; constraints on the last modified, created, or last accessed time for the file described by the entry; or the attributes of the entry. For details on the syntax for the selectionCriteria parameter, see . This method is intended for use with a ZipFile that has been read from storage. When creating a new ZipFile, this method will work only after the ZipArchive has been Saved to the disk (the ZipFile class subsequently and implicitly reads the Zip archive from storage.) Calling SelectEntries on a ZipFile that has not yet been saved will deliver undefined results. Thrown if selectionCriteria has an invalid syntax. This example removes all entries in a zip file that were modified prior to January 1st, 2008. using (ZipFile zip1 = ZipFile.Read(ZipFileName)) { // remove all entries from prior to Jan 1, 2008 zip1.RemoveEntries("mtime < 2008-01-01"); // don't forget to save the archive! zip1.Save(); } Using zip As ZipFile = ZipFile.Read(ZipFileName) ' remove all entries from prior to Jan 1, 2008 zip1.RemoveEntries("mtime < 2008-01-01") ' do not forget to save the archive! zip1.Save End Using the string that specifies which entries to select the number of entries removed Remove entries from the zipfile by specified criteria, and within the specified path in the archive. This method allows callers to remove the collection of entries from the zipfile that fit the specified criteria. The criteria are described in a string format, and can include patterns for the filename; constraints on the size of the entry; constraints on the last modified, created, or last accessed time for the file described by the entry; or the attributes of the entry. For details on the syntax for the selectionCriteria parameter, see . This method is intended for use with a ZipFile that has been read from storage. When creating a new ZipFile, this method will work only after the ZipArchive has been Saved to the disk (the ZipFile class subsequently and implicitly reads the Zip archive from storage.) Calling SelectEntries on a ZipFile that has not yet been saved will deliver undefined results. Thrown if selectionCriteria has an invalid syntax. using (ZipFile zip1 = ZipFile.Read(ZipFileName)) { // remove all entries from prior to Jan 1, 2008 zip1.RemoveEntries("mtime < 2008-01-01", "documents"); // a call to ZipFile.Save will make the modifications permanent zip1.Save(); } Using zip As ZipFile = ZipFile.Read(ZipFileName) ' remove all entries from prior to Jan 1, 2008 zip1.RemoveEntries("mtime < 2008-01-01", "documents") ' a call to ZipFile.Save will make the modifications permanent zip1.Save End Using the string that specifies which entries to select the directory in the archive from which to select entries. If null, then all directories in the archive are used. the number of entries removed Selects and Extracts a set of Entries from the ZipFile. The entries are extracted into the current working directory. If any of the files to be extracted already exist, then the action taken is as specified in the property on the corresponding ZipEntry instance. By default, the action taken in this case is to throw an exception. For information on the syntax of the selectionCriteria string, see . This example shows how extract all XML files modified after 15 January 2009. using (ZipFile zip = ZipFile.Read(zipArchiveName)) { zip.ExtractSelectedEntries("name = *.xml and mtime > 2009-01-15"); } the selection criteria for entries to extract. Selects and Extracts a set of Entries from the ZipFile. The entries are extracted into the current working directory. When extraction would would overwrite an existing filesystem file, the action taken is as specified in the parameter. For information on the syntax of the string describing the entry selection criteria, see . This example shows how extract all XML files modified after 15 January 2009, overwriting any existing files. using (ZipFile zip = ZipFile.Read(zipArchiveName)) { zip.ExtractSelectedEntries("name = *.xml and mtime > 2009-01-15", ExtractExistingFileAction.OverwriteSilently); } the selection criteria for entries to extract. The action to take if extraction would overwrite an existing file. Selects and Extracts a set of Entries from the ZipFile. The entries are selected from the specified directory within the archive, and then extracted into the current working directory. If any of the files to be extracted already exist, then the action taken is as specified in the property on the corresponding ZipEntry instance. By default, the action taken in this case is to throw an exception. For information on the syntax of the string describing the entry selection criteria, see . This example shows how extract all XML files modified after 15 January 2009, and writes them to the "unpack" directory. using (ZipFile zip = ZipFile.Read(zipArchiveName)) { zip.ExtractSelectedEntries("name = *.xml and mtime > 2009-01-15","unpack"); } the selection criteria for entries to extract. the directory in the archive from which to select entries. If null, then all directories in the archive are used. Selects and Extracts a set of Entries from the ZipFile. The entries are extracted into the specified directory. If any of the files to be extracted already exist, an exception will be thrown. For information on the syntax of the string describing the entry selection criteria, see . the selection criteria for entries to extract. the directory in the archive from which to select entries. If null, then all directories in the archive are used. the directory on the disk into which to extract. It will be created if it does not exist. Selects and Extracts a set of Entries from the ZipFile. The entries are extracted into the specified directory. When extraction would would overwrite an existing filesystem file, the action taken is as specified in the parameter. For information on the syntax of the string describing the entry selection criteria, see . This example shows how extract all files with an XML extension or with a size larger than 100,000 bytes, and puts them in the unpack directory. For any files that already exist in that destination directory, they will not be overwritten. using (ZipFile zip = ZipFile.Read(zipArchiveName)) { zip.ExtractSelectedEntries("name = *.xml or size > 100000", null, "unpack", ExtractExistingFileAction.DontOverwrite); } the selection criteria for entries to extract. The directory on the disk into which to extract. It will be created if it does not exist. The directory in the archive from which to select entries. If null, then all directories in the archive are used. The action to take if extraction would overwrite an existing file. Generic IEnumerator support, for use of a ZipFile in an enumeration. You probably do not want to call GetEnumerator explicitly. Instead it is implicitly called when you use a loop in C#, or a For Each loop in VB.NET. This example reads a zipfile of a given name, then enumerates the entries in that zip file, and displays the information about each entry on the Console. using (ZipFile zip = ZipFile.Read(zipfile)) { bool header = true; foreach (ZipEntry e in zip) { if (header) { System.Console.WriteLine("Zipfile: {0}", zip.Name); System.Console.WriteLine("Version Needed: 0x{0:X2}", e.VersionNeeded); System.Console.WriteLine("BitField: 0x{0:X2}", e.BitField); System.Console.WriteLine("Compression Method: 0x{0:X2}", e.CompressionMethod); System.Console.WriteLine("\n{1,-22} {2,-6} {3,4} {4,-8} {0}", "Filename", "Modified", "Size", "Ratio", "Packed"); System.Console.WriteLine(new System.String('-', 72)); header = false; } System.Console.WriteLine("{1,-22} {2,-6} {3,4:F0}% {4,-8} {0}", e.FileName, e.LastModified.ToString("yyyy-MM-dd HH:mm:ss"), e.UncompressedSize, e.CompressionRatio, e.CompressedSize); e.Extract(); } } Dim ZipFileToExtract As String = "c:\foo.zip" Using zip As ZipFile = ZipFile.Read(ZipFileToExtract) Dim header As Boolean = True Dim e As ZipEntry For Each e In zip If header Then Console.WriteLine("Zipfile: {0}", zip.Name) Console.WriteLine("Version Needed: 0x{0:X2}", e.VersionNeeded) Console.WriteLine("BitField: 0x{0:X2}", e.BitField) Console.WriteLine("Compression Method: 0x{0:X2}", e.CompressionMethod) Console.WriteLine(ChrW(10) & "{1,-22} {2,-6} {3,4} {4,-8} {0}", _ "Filename", "Modified", "Size", "Ratio", "Packed" ) Console.WriteLine(New String("-"c, 72)) header = False End If Console.WriteLine("{1,-22} {2,-6} {3,4:F0}% {4,-8} {0}", _ e.FileName, _ e.LastModified.ToString("yyyy-MM-dd HH:mm:ss"), _ e.UncompressedSize, _ e.CompressionRatio, _ e.CompressedSize ) e.Extract Next End Using A generic enumerator suitable for use within a foreach loop. An IEnumerator, for use of a ZipFile in a foreach construct. This method is included for COM support. An application generally does not call this method directly. It is called implicitly by COM clients when enumerating the entries in the ZipFile instance. In VBScript, this is done with a For Each statement. In Javascript, this is done with new Enumerator(zipfile). The IEnumerator over the entries in the ZipFile. Options for using ZIP64 extensions when saving zip archives. Designed many years ago, the original zip specification from PKWARE allowed for 32-bit quantities for the compressed and uncompressed sizes of zip entries, as well as a 32-bit quantity for specifying the length of the zip archive itself, and a maximum of 65535 entries. These limits are now regularly exceeded in many backup and archival scenarios. Recently, PKWare added extensions to the original zip spec, called "ZIP64 extensions", to raise those limitations. This property governs whether DotNetZip will use those extensions when writing zip archives. The use of these extensions is optional and explicit in DotNetZip because, despite the status of ZIP64 as a bona fide standard, many other zip tools and libraries do not support ZIP64, and therefore a zip file with ZIP64 extensions may be unreadable by some of those other tools. Set this property to to always use ZIP64 extensions when saving, regardless of whether your zip archive needs it. Suppose you add 5 files, each under 100k, to a ZipFile. If you specify Always for this flag, you will get a ZIP64 archive, though the archive does not need to use ZIP64 because none of the original zip limits had been exceeded. Set this property to to tell the DotNetZip library to never use ZIP64 extensions. This is useful for maximum compatibility and interoperability, at the expense of the capability of handling large files or large archives. NB: Windows Explorer in Windows XP and Windows Vista cannot currently extract files from a zip64 archive, so if you want to guarantee that a zip archive produced by this library will work in Windows Explorer, use Never. If you set this property to , and your application creates a zip that would exceed one of the Zip limits, the library will throw an exception while saving the zip file. Set this property to to tell the DotNetZip library to use the ZIP64 extensions when required by the entry. After the file is compressed, the original and compressed sizes are checked, and if they exceed the limits described above, then zip64 can be used. That is the general idea, but there is an additional wrinkle when saving to a non-seekable device, like the ASP.NET Response.OutputStream, or Console.Out. When using non-seekable streams for output, the entry header - which indicates whether zip64 is in use - is emitted before it is known if zip64 is necessary. It is only after all entries have been saved that it can be known if ZIP64 will be required. On seekable output streams, after saving all entries, the library can seek backward and re-emit the zip file header to be consistent with the actual ZIP64 requirement. But using a non-seekable output stream, the library cannot seek backward, so the header can never be changed. In other words, the archive's use of ZIP64 extensions is not alterable after the header is emitted. Therefore, when saving to non-seekable streams, using is the same as using : it will always produce a zip archive that uses ZIP64 extensions. The default behavior, which is "Never". (For COM clients, this is a 0 (zero).) Do not use ZIP64 extensions when writing zip archives. (For COM clients, this is a 0 (zero).) Use ZIP64 extensions when writing zip archives, as necessary. For example, when a single entry exceeds 0xFFFFFFFF in size, or when the archive as a whole exceeds 0xFFFFFFFF in size, or when there are more than 65535 entries in an archive. (For COM clients, this is a 1.) Always use ZIP64 extensions when writing zip archives, even when unnecessary. (For COM clients, this is a 2.) An enum representing the values on a three-way toggle switch for various options in the library. This might be used to specify whether to employ a particular text encoding, or to use ZIP64 extensions, or some other option. The default behavior. This is the same as "Never". (For COM clients, this is a 0 (zero).) Never use the associated option. (For COM clients, this is a 0 (zero).) Use the associated behavior "as necessary." (For COM clients, this is a 1.) Use the associated behavior Always, whether necessary or not. (For COM clients, this is a 2.) A class for collecting the various options that can be used when Reading zip files for extraction or update. When reading a zip file, there are several options an application can set, to modify how the file is read, or what the library does while reading. This class collects those options into one container. Pass an instance of the ReadOptions class into the ZipFile.Read() method. . . An event handler for Read operations. When opening large zip archives, you may want to display a progress bar or other indicator of status progress while reading. This parameter allows you to specify a ReadProgress Event Handler directly. When you call Read(), the progress event is invoked as necessary. The System.IO.TextWriter to use for writing verbose status messages during operations on the zip archive. A console application may wish to pass System.Console.Out to get messages on the Console. A graphical or headless application may wish to capture the messages in a different TextWriter, such as a System.IO.StringWriter. The System.Text.Encoding to use when reading in the zip archive. Be careful specifying the encoding. If the value you use here is not the same as the Encoding used when the zip archive was created (possibly by a different archiver) you will get unexpected results and possibly exceptions. An enum that provides the different self-extractor flavors A self-extracting zip archive that runs from the console or command line. A self-extracting zip archive that presents a graphical user interface when it is executed. The options for generating a self-extracting archive. The type of SFX to create. The command to run after extraction. This is optional. Leave it empty (null in C# or Nothing in VB) to run no command after extraction. If it is non-empty, the SFX will execute the command specified in this string on the user's machine, and using the extract directory as the working directory for the process, after unpacking the archive. The program to execute can include a path, if you like. If you want to execute a program that accepts arguments, specify the program name, followed by a space, and then the arguments for the program, each separated by a space, just as you would on a normal command line. Example: program.exe arg1 arg2. The string prior to the first space will be taken as the program name, and the string following the first space specifies the arguments to the program. If you want to execute a program that has a space in the name or path of the file, surround the program name in double-quotes. The first character of the command line should be a double-quote character, and there must be a matching double-quote following the end of the program file name. Any optional arguments to the program follow that, separated by spaces. Example: "c:\project files\program name.exe" arg1 arg2. If the flavor of the SFX is SelfExtractorFlavor.ConsoleApplication, then the SFX starts a new process, using this string as the post-extract command line. The SFX waits for the process to exit. The exit code of the post-extract command line is returned as the exit code of the command-line self-extractor exe. A non-zero exit code is typically used to indicated a failure by the program. In the case of an SFX, a non-zero exit code may indicate a failure during extraction, OR, it may indicate a failure of the run-after-extract program if specified, OR, it may indicate the run-after-extract program could not be fuond. There is no way to distinguish these conditions from the calling shell, aside from parsing the output of the SFX. If you have Quiet set to true, you may not see error messages, if a problem occurs. If the flavor of the SFX is SelfExtractorFlavor.WinFormsApplication, then the SFX starts a new process, using this string as the post-extract command line, and using the extract directory as the working directory for the process. The SFX does not wait for the command to complete, and does not check the exit code of the program. If the run-after-extract program cannot be fuond, a message box is displayed indicating that fact. You can specify environment variables within this string, with a format like %NAME%. The value of these variables will be expanded at the time the SFX is run. Example: %WINDIR%\system32\xcopy.exe may expand at runtime to c:\Windows\System32\xcopy.exe. By combining this with the RemoveUnpackedFilesAfterExecute flag, you can create an SFX that extracts itself, runs a file that was extracted, then deletes all the files that were extracted. If you want it to run "invisibly" then set Flavor to SelfExtractorFlavor.ConsoleApplication, and set Quiet to true. The user running such an EXE will see a console window appear, then disappear quickly. You may also want to specify the default extract location, with DefaultExtractDirectory. If you set Flavor to SelfExtractorFlavor.WinFormsApplication, and set Quiet to true, then a GUI with progressbars is displayed, but it is "non-interactive" - it accepts no input from the user. Instead the SFX just automatically unpacks and exits. The default extract directory the user will see when running the self-extracting archive. Passing null (or Nothing in VB) here will cause the Self Extractor to use the the user's personal directory () for the default extract location. This is only a default location. The actual extract location will be settable on the command line when the SFX is executed. You can specify environment variables within this string, with %NAME%. The value of these variables will be expanded at the time the SFX is run. Example: %USERPROFILE%\Documents\unpack may expand at runtime to c:\users\melvin\Documents\unpack. The name of an .ico file in the filesystem to use for the application icon for the generated SFX. Normally, DotNetZip will embed an "zipped folder" icon into the generated SFX. If you prefer to use a different icon, you can specify it here. It should be a .ico file. This file is passed as the /win32icon option to the csc.exe compiler when constructing the SFX file. Whether the ConsoleApplication SFX will be quiet during extraction. This option affects the way the generated SFX runs. By default it is false. When you set it to true,... Flavor Behavior ConsoleApplication no messages will be emitted during successful operation. Double-clicking the SFX in Windows Explorer or as an attachment in an email will cause a console window to appear briefly, before it disappears. If you run the ConsoleApplication SFX from the cmd.exe prompt, it runs as a normal console app; by default, because it is quiet, it displays no messages to the console. If you pass the -v+ command line argument to the Console SFX when you run it, you will get verbose messages to the console. WinFormsApplication the SFX extracts automatically when the application is launched, with no additional user input. When you set it to false,... Flavor Behavior ConsoleApplication the extractor will emit a message to the console for each entry extracted. When double-clicking to launch the SFX, the console window will remain, and the SFX will emit a message for each file as it extracts. The messages fly by quickly, they won't be easily readable, unless the extracted files are fairly large. WinFormsApplication the SFX presents a forms UI and allows the user to select options before extracting. Specify what the self-extractor will do when extracting an entry would overwrite an existing file. The default behavvior is to Throw. Whether to remove the files that have been unpacked, after executing the PostExtractCommandLine. If true, and if there is a PostExtractCommandLine, and if the command runs successfully, then the files that the SFX unpacked will be removed, afterwards. If the command does not complete successfully (non-zero return code), that is interpreted as a failure, and the extracted files will not be removed. Setting this flag, and setting Flavor to SelfExtractorFlavor.ConsoleApplication, and setting Quiet to true, results in an SFX that extracts itself, runs a file that was extracted, then deletes all the files that were extracted, with no intervention by the user. You may also want to specify the default extract location, with DefaultExtractDirectory. The file version number to embed into the generated EXE. It will show up, for example, during a mouseover in Windows Explorer. The product version to embed into the generated EXE. It will show up, for example, during a mouseover in Windows Explorer. You can use any arbitrary string, but a human-readable version number is recommended. For example "v1.2 alpha" or "v4.2 RC2". If you specify nothing, then there is no product version embedded into the EXE. The copyright notice, if any, to embed into the generated EXE. It will show up, for example, while viewing properties of the file in Windows Explorer. You can use any arbitrary string, but typically you want something like "Copyright � Dino Chiesa 2011". The description to embed into the generated EXE. Use any arbitrary string. This text will be displayed during a mouseover in Windows Explorer. If you specify nothing, then the string "DotNetZip SFX Archive" is embedded into the EXE as the description. The product name to embed into the generated EXE. Use any arbitrary string. This text will be displayed while viewing properties of the EXE file in Windows Explorer. The title to display in the Window of a GUI SFX, while it extracts. By default the title show in the GUI window of a self-extractor is "DotNetZip Self-extractor (http://DotNetZip.codeplex.com/)". You can change that by setting this property before saving the SFX. This property has an effect only when producing a Self-extractor of flavor SelfExtractorFlavor.WinFormsApplication. Additional options for the csc.exe compiler, when producing the SFX EXE. Provides a stream metaphor for generating zip files. This class writes zip files, as defined in the specification for zip files described by PKWare. The compression for this implementation is provided by a managed-code version of Zlib, included with DotNetZip in the classes in the Ionic.Zlib namespace. This class provides an alternative programming model to the one enabled by the class. Use this when creating zip files, as an alternative to the class, when you would like to use a Stream type to write the zip file. Both the ZipOutputStream class and the ZipFile class can be used to create zip files. Both of them support many of the common zip features, including Unicode, different compression levels, and ZIP64. They provide very similar performance when creating zip files. The ZipFile class is generally easier to use than ZipOutputStream and should be considered a higher-level interface. For example, when creating a zip file via calls to the PutNextEntry() and Write() methods on the ZipOutputStream class, the caller is responsible for opening the file, reading the bytes from the file, writing those bytes into the ZipOutputStream, setting the attributes on the ZipEntry, and setting the created, last modified, and last accessed timestamps on the zip entry. All of these things are done automatically by a call to ZipFile.AddFile(). For this reason, the ZipOutputStream is generally recommended for use only when your application emits arbitrary data, not necessarily data from a filesystem file, directly into a zip file, and does so using a Stream metaphor. Aside from the differences in programming model, there are other differences in capability between the two classes. ZipFile can be used to read and extract zip files, in addition to creating zip files. ZipOutputStream cannot read zip files. If you want to use a stream to read zip files, check out the class. ZipOutputStream does not support the creation of segmented or spanned zip files. ZipOutputStream cannot produce a self-extracting archive. Be aware that the ZipOutputStream class implements the interface. In order for ZipOutputStream to produce a valid zip file, you use use it within a using clause (Using in VB), or call the Dispose() method explicitly. See the examples for how to employ a using clause. Also, a note regarding compression performance: On the desktop .NET Framework, DotNetZip can use a multi-threaded compression implementation that provides significant speed increases on large files, over 300k or so, at the cost of increased memory use at runtime. (The output of the compression is almost exactly the same size). But, the multi-threaded approach incurs a performance hit on smaller files. There's no way for the ZipOutputStream to know whether parallel compression will be beneficial, because the ZipOutputStream does not know how much data you will write through the stream. You may wish to set the property to zero, if you are compressing large files through ZipOutputStream. This will cause parallel compression to be used, always. Create a ZipOutputStream, wrapping an existing stream. The class is generally easier to use when creating zip files. The ZipOutputStream offers a different metaphor for creating a zip file, based on the class. The stream to wrap. It must be writable. This stream will be closed at the time the ZipOutputStream is closed. This example shows how to create a zip file, using the ZipOutputStream class. private void Zipup() { if (filesToZip.Count == 0) { System.Console.WriteLine("Nothing to do."); return; } using (var raw = File.Open(_outputFileName, FileMode.Create, FileAccess.ReadWrite )) { using (var output= new ZipOutputStream(raw)) { output.Password = "VerySecret!"; output.Encryption = EncryptionAlgorithm.WinZipAes256; foreach (string inputFileName in filesToZip) { System.Console.WriteLine("file: {0}", inputFileName); output.PutNextEntry(inputFileName); using (var input = File.Open(inputFileName, FileMode.Open, FileAccess.Read, FileShare.Read | FileShare.Write )) { byte[] buffer= new byte[2048]; int n; while ((n= input.Read(buffer,0,buffer.Length)) > 0) { output.Write(buffer,0,n); } } } } } } Private Sub Zipup() Dim outputFileName As String = "XmlData.zip" Dim filesToZip As String() = Directory.GetFiles(".", "*.xml") If (filesToZip.Length = 0) Then Console.WriteLine("Nothing to do.") Else Using raw As FileStream = File.Open(outputFileName, FileMode.Create, FileAccess.ReadWrite) Using output As ZipOutputStream = New ZipOutputStream(raw) output.Password = "VerySecret!" output.Encryption = EncryptionAlgorithm.WinZipAes256 Dim inputFileName As String For Each inputFileName In filesToZip Console.WriteLine("file: {0}", inputFileName) output.PutNextEntry(inputFileName) Using input As FileStream = File.Open(inputFileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite) Dim n As Integer Dim buffer As Byte() = New Byte(2048) {} Do While (n = input.Read(buffer, 0, buffer.Length) > 0) output.Write(buffer, 0, n) Loop End Using Next End Using End Using End If End Sub Create a ZipOutputStream that writes to a filesystem file. The class is generally easier to use when creating zip files. The ZipOutputStream offers a different metaphor for creating a zip file, based on the class. The name of the zip file to create. This example shows how to create a zip file, using the ZipOutputStream class. private void Zipup() { if (filesToZip.Count == 0) { System.Console.WriteLine("Nothing to do."); return; } using (var output= new ZipOutputStream(outputFileName)) { output.Password = "VerySecret!"; output.Encryption = EncryptionAlgorithm.WinZipAes256; foreach (string inputFileName in filesToZip) { System.Console.WriteLine("file: {0}", inputFileName); output.PutNextEntry(inputFileName); using (var input = File.Open(inputFileName, FileMode.Open, FileAccess.Read, FileShare.Read | FileShare.Write )) { byte[] buffer= new byte[2048]; int n; while ((n= input.Read(buffer,0,buffer.Length)) > 0) { output.Write(buffer,0,n); } } } } } Private Sub Zipup() Dim outputFileName As String = "XmlData.zip" Dim filesToZip As String() = Directory.GetFiles(".", "*.xml") If (filesToZip.Length = 0) Then Console.WriteLine("Nothing to do.") Else Using output As ZipOutputStream = New ZipOutputStream(outputFileName) output.Password = "VerySecret!" output.Encryption = EncryptionAlgorithm.WinZipAes256 Dim inputFileName As String For Each inputFileName In filesToZip Console.WriteLine("file: {0}", inputFileName) output.PutNextEntry(inputFileName) Using input As FileStream = File.Open(inputFileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite) Dim n As Integer Dim buffer As Byte() = New Byte(2048) {} Do While (n = input.Read(buffer, 0, buffer.Length) > 0) output.Write(buffer, 0, n) Loop End Using Next End Using End If End Sub Create a ZipOutputStream. See the documentation for the ZipOutputStream(Stream) constructor for an example. The stream to wrap. It must be writable. true if the application would like the stream to remain open after the ZipOutputStream has been closed. Provides a string representation of the instance. This can be useful for debugging purposes. a string representation of the instance. Sets the password to be used on the ZipOutputStream instance. When writing a zip archive, this password is applied to the entries, not to the zip archive itself. It applies to any ZipEntry subsequently written to the ZipOutputStream. Using a password does not encrypt or protect the "directory" of the archive - the list of entries contained in the archive. If you set the Password property, the password actually applies to individual entries that are added to the archive, subsequent to the setting of this property. The list of filenames in the archive that is eventually created will appear in clear text, but the contents of the individual files are encrypted. This is how Zip encryption works. If you set this property, and then add a set of entries to the archive via calls to PutNextEntry, then each entry is encrypted with that password. You may also want to change the password between adding different entries. If you set the password, add an entry, then set the password to null (Nothing in VB), and add another entry, the first entry is encrypted and the second is not. When setting the Password, you may also want to explicitly set the property, to specify how to encrypt the entries added to the ZipFile. If you set the Password to a non-null value and do not set , then PKZip 2.0 ("Weak") encryption is used. This encryption is relatively weak but is very interoperable. If you set the password to a null value (Nothing in VB), Encryption is reset to None. Special case: if you wrap a ZipOutputStream around a non-seekable stream, and use encryption, and emit an entry of zero bytes, the Close() or PutNextEntry() following the entry will throw an exception. The Encryption to use for entries added to the ZipOutputStream. The specified Encryption is applied to the entries subsequently written to the ZipOutputStream instance. If you set this to something other than EncryptionAlgorithm.None, you will also need to set the to a non-null, non-empty value in order to actually get encryption on the entry. ZipOutputStream.Password ZipEntry.Encryption Size of the work buffer to use for the ZLIB codec during compression. Setting this may affect performance. For larger files, setting this to a larger size may improve performance, but I'm not sure. Sorry, I don't currently have good recommendations on how to set it. You can test it if you like. The compression strategy to use for all entries. Set the Strategy used by the ZLIB-compatible compressor, when compressing data for the entries in the zip archive. Different compression strategies work better on different sorts of data. The strategy parameter can affect the compression ratio and the speed of compression but not the correctness of the compresssion. For more information see . The type of timestamp attached to the ZipEntry. Set this in order to specify the kind of timestamp that should be emitted into the zip file for each entry. Sets the compression level to be used for entries subsequently added to the zip archive. Varying the compression level used on entries can affect the size-vs-speed tradeoff when compression and decompressing data streams or files. As with some other properties on the ZipOutputStream class, like , and , setting this property on a ZipOutputStream instance will cause the specified CompressionLevel to be used on all items that are subsequently added to the ZipOutputStream instance. If you do not set this property, the default compression level is used, which normally gives a good balance of compression efficiency and compression speed. In some tests, using BestCompression can double the time it takes to compress, while delivering just a small increase in compression efficiency. This behavior will vary with the type of data you compress. If you are in doubt, just leave this setting alone, and accept the default. The compression method used on each entry added to the ZipOutputStream. A comment attached to the zip archive. The application sets this property to specify a comment to be embedded into the generated zip archive. According to PKWARE's zip specification, the comment is not encrypted, even if there is a password set on the zip file. The specification does not describe how to indicate the encoding used on a comment string. Many "compliant" zip tools and libraries use IBM437 as the code page for comments; DotNetZip, too, follows that practice. On the other hand, there are situations where you want a Comment to be encoded with something else, for example using code page 950 "Big-5 Chinese". To fill that need, DotNetZip will encode the comment following the same procedure it follows for encoding filenames: (a) if is Never, it uses the default encoding (IBM437). (b) if is Always, it always uses the alternate encoding (). (c) if is AsNecessary, it uses the alternate encoding only if the default encoding is not sufficient for encoding the comment - in other words if decoding the result does not produce the original string. This decision is taken at the time of the call to ZipFile.Save(). Specify whether to use ZIP64 extensions when saving a zip archive. The default value for the property is . is safest, in the sense that you will not get an Exception if a pre-ZIP64 limit is exceeded. You must set this property before calling Write(). Indicates whether ZIP64 extensions were used when saving the zip archive. The value is defined only after the ZipOutputStream has been closed. Whether the ZipOutputStream should use case-insensitive comparisons when checking for uniqueness of zip entries. Though the zip specification doesn't prohibit zipfiles with duplicate entries, Sane zip files have no duplicates, and the DotNetZip library cannot create zip files with duplicate entries. If an application attempts to call with a name that duplicates one already used within the archive, the library will throw an Exception. This property allows the application to specify whether the ZipOutputStream instance considers ordinal case when checking for uniqueness of zip entries. Indicates whether to encode entry filenames and entry comments using Unicode (UTF-8). The PKWare zip specification provides for encoding file names and file comments in either the IBM437 code page, or in UTF-8. This flag selects the encoding according to that specification. By default, this flag is false, and filenames and comments are encoded into the zip file in the IBM437 codepage. Setting this flag to true will specify that filenames and comments that cannot be encoded with IBM437 will be encoded with UTF-8. Zip files created with strict adherence to the PKWare specification with respect to UTF-8 encoding can contain entries with filenames containing any combination of Unicode characters, including the full range of characters from Chinese, Latin, Hebrew, Greek, Cyrillic, and many other alphabets. However, because at this time, the UTF-8 portion of the PKWare specification is not broadly supported by other zip libraries and utilities, such zip files may not be readable by your favorite zip tool or archiver. In other words, interoperability will decrease if you set this flag to true. In particular, Zip files created with strict adherence to the PKWare specification with respect to UTF-8 encoding will not work well with Explorer in Windows XP or Windows Vista, because Windows compressed folders, as far as I know, do not support UTF-8 in zip files. Vista can read the zip files, but shows the filenames incorrectly. Unpacking from Windows Vista Explorer will result in filenames that have rubbish characters in place of the high-order UTF-8 bytes. Also, zip files that use UTF-8 encoding will not work well with Java applications that use the java.util.zip classes, as of v5.0 of the Java runtime. The Java runtime does not correctly implement the PKWare specification in this regard. As a result, we have the unfortunate situation that "correct" behavior by the DotNetZip library with regard to Unicode encoding of filenames during zip creation will result in zip files that are readable by strictly compliant and current tools (for example the most recent release of the commercial WinZip tool); but these zip files will not be readable by various other tools or libraries, including Windows Explorer. The DotNetZip library can read and write zip files with UTF8-encoded entries, according to the PKware spec. If you use DotNetZip for both creating and reading the zip file, and you use UTF-8, there will be no loss of information in the filenames. For example, using a self-extractor created by this library will allow you to unpack files correctly with no loss of information in the filenames. If you do not set this flag, it will remain false. If this flag is false, the ZipOutputStream will encode all filenames and comments using the IBM437 codepage. This can cause "loss of information" on some filenames, but the resulting zipfile will be more interoperable with other utilities. As an example of the loss of information, diacritics can be lost. The o-tilde character will be down-coded to plain o. The c with a cedilla (Unicode 0xE7) used in Portugese will be downcoded to a c. Likewise, the O-stroke character (Unicode 248), used in Danish and Norwegian, will be down-coded to plain o. Chinese characters cannot be represented in codepage IBM437; when using the default encoding, Chinese characters in filenames will be represented as ?. These are all examples of "information loss". The loss of information associated to the use of the IBM437 encoding is inconvenient, and can also lead to runtime errors. For example, using IBM437, any sequence of 4 Chinese characters will be encoded as ????. If your application creates a ZipOutputStream, does not set the encoding, then adds two files, each with names of four Chinese characters each, this will result in a duplicate filename exception. In the case where you add a single file with a name containing four Chinese characters, the zipfile will save properly, but extracting that file later, with any zip tool, will result in an error, because the question mark is not legal for use within filenames on Windows. These are just a few examples of the problems associated to loss of information. This flag is independent of the encoding of the content within the entries in the zip file. Think of the zip file as a container - it supports an encoding. Within the container are other "containers" - the file entries themselves. The encoding within those entries is independent of the encoding of the zip archive container for those entries. Rather than specify the encoding in a binary fashion using this flag, an application can specify an arbitrary encoding via the property. Setting the encoding explicitly when creating zip archives will result in non-compliant zip files that, curiously, are fairly interoperable. The challenge is, the PKWare specification does not provide for a way to specify that an entry in a zip archive uses a code page that is neither IBM437 nor UTF-8. Therefore if you set the encoding explicitly when creating a zip archive, you must take care upon reading the zip archive to use the same code page. If you get it wrong, the behavior is undefined and may result in incorrect filenames, exceptions, stomach upset, hair loss, and acne. The text encoding to use when emitting entries into the zip archive, for those entries whose filenames or comments cannot be encoded with the default (IBM437) encoding. In its zip specification, PKWare describes two options for encoding filenames and comments: using IBM437 or UTF-8. But, some archiving tools or libraries do not follow the specification, and instead encode characters using the system default code page. For example, WinRAR when run on a machine in Shanghai may encode filenames with the Big-5 Chinese (950) code page. This behavior is contrary to the Zip specification, but it occurs anyway. When using DotNetZip to write zip archives that will be read by one of these other archivers, set this property to specify the code page to use when encoding the and for each ZipEntry in the zip file, for values that cannot be encoded with the default codepage for zip files, IBM437. This is why this property is "provisional". In all cases, IBM437 is used where possible, in other words, where no loss of data would result. It is possible, therefore, to have a given entry with a Comment encoded in IBM437 and a FileName encoded with the specified "provisional" codepage. Be aware that a zip file created after you've explicitly set the ProvisionalAlternateEncoding property to a value other than IBM437 may not be compliant to the PKWare specification, and may not be readable by compliant archivers. On the other hand, many (most?) archivers are non-compliant and can read zip files created in arbitrary code pages. The trick is to use or specify the proper codepage when reading the zip. When creating a zip archive using this library, it is possible to change the value of ProvisionalAlternateEncoding between each entry you add, and between adding entries and the call to Close(). Don't do this. It will likely result in a zipfile that is not readable. For best interoperability, either leave ProvisionalAlternateEncoding alone, or specify it only once, before adding any entries to the ZipOutputStream instance. There is one exception to this recommendation, described later. When using an arbitrary, non-UTF8 code page for encoding, there is no standard way for the creator application - whether DotNetZip, WinZip, WinRar, or something else - to formally specify in the zip file which codepage has been used for the entries. As a result, readers of zip files are not able to inspect the zip file and determine the codepage that was used for the entries contained within it. It is left to the application or user to determine the necessary codepage when reading zip files encoded this way. If you use an incorrect codepage when reading a zipfile, you will get entries with filenames that are incorrect, and the incorrect filenames may even contain characters that are not legal for use within filenames in Windows. Extracting entries with illegal characters in the filenames will lead to exceptions. It's too bad, but this is just the way things are with code pages in zip files. Caveat Emptor. One possible approach for specifying the code page for a given zip file is to describe the code page in a human-readable form in the Zip comment. For example, the comment may read "Entries in this archive are encoded in the Big5 code page". For maximum interoperability, the zip comment in this case should be encoded in the default, IBM437 code page. In this case, the zip comment is encoded using a different page than the filenames. To do this, Specify ProvisionalAlternateEncoding to your desired region-specific code page, once before adding any entries, and then set the property and reset ProvisionalAlternateEncoding to IBM437 before calling Close(). A Text Encoding to use when encoding the filenames and comments for all the ZipEntry items, during a ZipFile.Save() operation. Whether the encoding specified here is used during the save depends on . A flag that tells if and when this instance should apply AlternateEncoding to encode the filenames and comments associated to of ZipEntry objects contained within this instance. The default text encoding used in zip archives. It is numeric 437, also known as IBM437. The size threshold for an entry, above which a parallel deflate is used. DotNetZip will use multiple threads to compress any ZipEntry, when the CompressionMethod is Deflate, and if the entry is larger than the given size. Zero means "always use parallel deflate", while -1 means "never use parallel deflate". If the entry size cannot be known before compression, as with any entry added via a ZipOutputStream, then Parallel deflate will never be performed, unless the value of this property is zero. A parallel deflate operations will speed up the compression of large files, on computers with multiple CPUs or multiple CPU cores. For files above 1mb, on a dual core or dual-cpu (2p) machine, the time required to compress the file can be 70% of the single-threaded deflate. For very large files on 4p machines the compression can be done in 30% of the normal time. The downside is that parallel deflate consumes extra memory during the deflate, and the deflation is slightly less effective. Parallel deflate tends to not be as effective as single-threaded deflate because the original data stream is split into multiple independent buffers, each of which is compressed in parallel. But because they are treated independently, there is no opportunity to share compression dictionaries, and additional framing bytes must be added to the output stream. For that reason, a deflated stream may be slightly larger when compressed using parallel deflate, as compared to a traditional single-threaded deflate. For files of about 512k, the increase over the normal deflate is as much as 5% of the total compressed size. For larger files, the difference can be as small as 0.1%. Multi-threaded compression does not give as much an advantage when using Encryption. This is primarily because encryption tends to slow down the entire pipeline. Also, multi-threaded compression gives less of an advantage when using lower compression levels, for example . You may have to perform some tests to determine the best approach for your situation. The default value for this property is -1, which means parallel compression will not be performed unless you set it to zero. The maximum number of buffer pairs to use when performing parallel compression. This property sets an upper limit on the number of memory buffer pairs to create when performing parallel compression. The implementation of the parallel compression stream allocates multiple buffers to facilitate parallel compression. As each buffer fills up, the stream uses ThreadPool.QueueUserWorkItem() to compress those buffers in a background threadpool thread. After a buffer is compressed, it is re-ordered and written to the output stream. A higher number of buffer pairs enables a higher degree of parallelism, which tends to increase the speed of compression on multi-cpu computers. On the other hand, a higher number of buffer pairs also implies a larger memory consumption, more active worker threads, and a higher cpu utilization for any compression. This property enables the application to limit its memory consumption and CPU utilization behavior depending on requirements. For each compression "task" that occurs in parallel, there are 2 buffers allocated: one for input and one for output. This property sets a limit for the number of pairs. The total amount of storage space allocated for buffering will then be (N*S*2), where N is the number of buffer pairs, S is the size of each buffer (). By default, DotNetZip allocates 4 buffer pairs per CPU core, so if your machine has 4 cores, and you retain the default buffer size of 128k, then the ParallelDeflateOutputStream will use 4 * 4 * 2 * 128kb of buffer memory in total, or 4mb, in blocks of 128kb. If you then set this property to 8, then the number will be 8 * 2 * 128kb of buffer memory, or 2mb. CPU utilization will also go up with additional buffers, because a larger number of buffer pairs allows a larger number of background threads to compress in parallel. If you find that parallel compression is consuming too much memory or CPU, you can adjust this value downward. The default value is 16. Different values may deliver better or worse results, depending on your priorities and the dynamic performance characteristics of your storage and compute resources. This property is not the number of buffer pairs to use; it is an upper limit. An illustration: Suppose you have an application that uses the default value of this property (which is 16), and it runs on a machine with 2 CPU cores. In that case, DotNetZip will allocate 4 buffer pairs per CPU core, for a total of 8 pairs. The upper limit specified by this property has no effect. The application can set this value at any time, but it is effective only if set before calling ZipOutputStream.Write() for the first time. Returns true if an entry by the given name has already been written to the ZipOutputStream. The name of the entry to scan for. true if an entry by the given name has already been written. Write the data from the buffer to the stream. As the application writes data into this stream, the data may be compressed and encrypted before being written out to the underlying stream, depending on the settings of the and the properties. The buffer holding data to write to the stream. the offset within that data array to find the first byte to write. the number of bytes to write. Specify the name of the next entry that will be written to the zip file. Call this method just before calling , to specify the name of the entry that the next set of bytes written to the ZipOutputStream belongs to. All subsequent calls to Write, until the next call to PutNextEntry, will be inserted into the named entry in the zip file. If the used in PutNextEntry() ends in a slash, then the entry added is marked as a directory. Because directory entries do not contain data, a call to Write(), before an intervening additional call to PutNextEntry(), will throw an exception. If you don't call Write() between two calls to PutNextEntry(), the first entry is inserted into the zip file as a file of zero size. This may be what you want. Because PutNextEntry() closes out the prior entry, if any, this method may throw if there is a problem with the prior entry. This method returns the ZipEntry. You can modify public properties on the ZipEntry, such as , , and so on, until the first call to ZipOutputStream.Write(), or until the next call to PutNextEntry(). If you modify the ZipEntry after having called Write(), you may get a runtime exception, or you may silently get an invalid zip archive. This example shows how to create a zip file, using the ZipOutputStream class. private void Zipup() { using (FileStream fs raw = File.Open(_outputFileName, FileMode.Create, FileAccess.ReadWrite )) { using (var output= new ZipOutputStream(fs)) { output.Password = "VerySecret!"; output.Encryption = EncryptionAlgorithm.WinZipAes256; output.PutNextEntry("entry1.txt"); byte[] buffer= System.Text.Encoding.ASCII.GetBytes("This is the content for entry #1."); output.Write(buffer,0,buffer.Length); output.PutNextEntry("entry2.txt"); // this will be zero length output.PutNextEntry("entry3.txt"); buffer= System.Text.Encoding.ASCII.GetBytes("This is the content for entry #3."); output.Write(buffer,0,buffer.Length); } } } The name of the entry to be added, including any path to be used within the zip file. The ZipEntry created. Dispose the stream This method writes the Zip Central directory, then closes the stream. The application must call Dispose() (or Close) in order to produce a valid zip file. Typically the application will call Dispose() implicitly, via a using statement in C#, or a Using statement in VB. set this to true, always. Always returns false. Always returns false. Always returns true. Always returns a NotSupportedException. Setting this property always returns a NotSupportedException. Getting it returns the value of the Position on the underlying stream. This is a no-op. This method always throws a NotSupportedException. ignored ignored ignored nothing This method always throws a NotSupportedException. ignored ignored nothing This method always throws a NotSupportedException. ignored Sort-of like a factory method, ForUpdate is used only when the application needs to update the zip entry metadata for a segmented zip file, when the starting segment is earlier than the ending segment, for a particular entry. The update is always contiguous, never rolls over. As a result, this method doesn't need to return a ZSS; it can simply return a FileStream. That's why it's "sort of" like a Factory method. Caller must Close/Dispose the stream object returned by this method. Name of the filesystem file corresponding to the current segment. The name is not always the name currently being used in the filesystem. When rwMode is RwMode.Write, the filesystem file has a temporary name until the stream is closed or until the next segment is started. Read from the stream the buffer to read the offset at which to start the number of bytes to read the number of bytes actually read Write to the stream. the buffer from which to write the offset at which to start writing the number of bytes to write Computes a CRC-32. The CRC-32 algorithm is parameterized - you can set the polynomial and enable or disable bit reversal. This can be used for GZIP, BZip2, or ZIP. This type is used internally by DotNetZip; it is generally not used directly by applications wishing to create, read, or manipulate zip archive files. Indicates the total number of bytes applied to the CRC. Indicates the current CRC for all blocks slurped in. Returns the CRC32 for the specified stream. The stream over which to calculate the CRC32 the CRC32 calculation Returns the CRC32 for the specified stream, and writes the input into the output stream. The stream over which to calculate the CRC32 The stream into which to deflate the input the CRC32 calculation Get the CRC32 for the given (word,byte) combo. This is a computation defined by PKzip for PKZIP 2.0 (weak) encryption. The word to start with. The byte to combine it with. The CRC-ized result. Update the value for the running CRC32 using the given block of bytes. This is useful when using the CRC32() class in a Stream. block of bytes to slurp starting point in the block how many bytes within the block to slurp Process one byte in the CRC. the byte to include into the CRC . Process a run of N identical bytes into the CRC. This method serves as an optimization for updating the CRC when a run of identical bytes is found. Rather than passing in a buffer of length n, containing all identical bytes b, this method accepts the byte value and the length of the (virtual) buffer - the length of the run. the byte to include into the CRC. the number of times that byte should be repeated. Combines the given CRC32 value with the current running total. This is useful when using a divide-and-conquer approach to calculating a CRC. Multiple threads can each calculate a CRC32 on a segment of the data, and then combine the individual CRC32 values at the end. the crc value to be combined with this one the length of data the CRC value was calculated on Create an instance of the CRC32 class using the default settings: no bit reversal, and a polynomial of 0xEDB88320. Create an instance of the CRC32 class, specifying whether to reverse data bits or not. specify true if the instance should reverse data bits. In the CRC-32 used by BZip2, the bits are reversed. Therefore if you want a CRC32 with compatibility with BZip2, you should pass true here. In the CRC-32 used by GZIP and PKZIP, the bits are not reversed; Therefore if you want a CRC32 with compatibility with those, you should pass false. Create an instance of the CRC32 class, specifying the polynomial and whether to reverse data bits or not. The polynomial to use for the CRC, expressed in the reversed (LSB) format: the highest ordered bit in the polynomial value is the coefficient of the 0th power; the second-highest order bit is the coefficient of the 1 power, and so on. Expressed this way, the polynomial for the CRC-32C used in IEEE 802.3, is 0xEDB88320. specify true if the instance should reverse data bits. In the CRC-32 used by BZip2, the bits are reversed. Therefore if you want a CRC32 with compatibility with BZip2, you should pass true here for the reverseBits parameter. In the CRC-32 used by GZIP and PKZIP, the bits are not reversed; Therefore if you want a CRC32 with compatibility with those, you should pass false for the reverseBits parameter. Reset the CRC-32 class - clear the CRC "remainder register." Use this when employing a single instance of this class to compute multiple, distinct CRCs on multiple, distinct data blocks. A Stream that calculates a CRC32 (a checksum) on all bytes read, or on all bytes written. This class can be used to verify the CRC of a ZipEntry when reading from a stream, or to calculate a CRC when writing to a stream. The stream should be used to either read, or write, but not both. If you intermix reads and writes, the results are not defined. This class is intended primarily for use internally by the DotNetZip library. The default constructor. Instances returned from this constructor will leave the underlying stream open upon Close(). The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320. The underlying stream The constructor allows the caller to specify how to handle the underlying stream at close. The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320. The underlying stream true to leave the underlying stream open upon close of the CrcCalculatorStream; false otherwise. A constructor allowing the specification of the length of the stream to read. The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320. Instances returned from this constructor will leave the underlying stream open upon Close(). The underlying stream The length of the stream to slurp A constructor allowing the specification of the length of the stream to read, as well as whether to keep the underlying stream open upon Close(). The stream uses the default CRC32 algorithm, which implies a polynomial of 0xEDB88320. The underlying stream The length of the stream to slurp true to leave the underlying stream open upon close of the CrcCalculatorStream; false otherwise. A constructor allowing the specification of the length of the stream to read, as well as whether to keep the underlying stream open upon Close(), and the CRC32 instance to use. The stream uses the specified CRC32 instance, which allows the application to specify how the CRC gets calculated. The underlying stream The length of the stream to slurp true to leave the underlying stream open upon close of the CrcCalculatorStream; false otherwise. the CRC32 instance to use to calculate the CRC32 Gets the total number of bytes run through the CRC32 calculator. This is either the total number of bytes read, or the total number of bytes written, depending on the direction of this stream. Provides the current CRC for all blocks slurped in. The running total of the CRC is kept as data is written or read through the stream. read this property after all reads or writes to get an accurate CRC for the entire stream. Indicates whether the underlying stream will be left open when the CrcCalculatorStream is Closed. Set this at any point before calling . Read from the stream the buffer to read the offset at which to start the number of bytes to read the number of bytes actually read Write to the stream. the buffer from which to write the offset at which to start writing the number of bytes to write Indicates whether the stream supports reading. Indicates whether the stream supports seeking. Always returns false. Indicates whether the stream supports writing. Flush the stream. Returns the length of the underlying stream. The getter for this property returns the total bytes read. If you use the setter, it will throw . Seeking is not supported on this stream. This method always throws N/A N/A N/A This method always throws N/A Closes the stream. Enumerates the options for a logical conjunction. This enum is intended for use internally by the FileSelector class. FileSelector encapsulates logic that selects files from a source - a zip file or the filesystem - based on a set of criteria. This class is used internally by the DotNetZip library, in particular for the AddSelectedFiles() methods. This class can also be used independently of the zip capability in DotNetZip. The FileSelector class is used internally by the ZipFile class for selecting files for inclusion into the ZipFile, when the method, or one of its overloads, is called. It's also used for the methods. Typically, an application that creates or manipulates Zip archives will not directly interact with the FileSelector class. Some applications may wish to use the FileSelector class directly, to select files from disk volumes based on a set of criteria, without creating or querying Zip archives. The file selection criteria include: a pattern to match the filename; the last modified, created, or last accessed time of the file; the size of the file; and the attributes of the file. Consult the documentation for for more information on specifying the selection criteria. Constructor that allows the caller to specify file selection criteria. This constructor allows the caller to specify a set of criteria for selection of files. See for a description of the syntax of the selectionCriteria string. By default the FileSelector will traverse NTFS Reparse Points. To change this, use FileSelector(String, bool). The criteria for file selection. Constructor that allows the caller to specify file selection criteria. This constructor allows the caller to specify a set of criteria for selection of files. See for a description of the syntax of the selectionCriteria string. The criteria for file selection. whether to traverse NTFS reparse points (junctions). The string specifying which files to include when retrieving. Specify the criteria in statements of 3 elements: a noun, an operator, and a value. Consider the string "name != *.doc" . The noun is "name". The operator is "!=", implying "Not Equal". The value is "*.doc". That criterion, in English, says "all files with a name that does not end in the .doc extension." Supported nouns include "name" (or "filename") for the filename; "atime", "mtime", and "ctime" for last access time, last modfied time, and created time of the file, respectively; "attributes" (or "attrs") for the file attributes; "size" (or "length") for the file length (uncompressed); and "type" for the type of object, either a file or a directory. The "attributes", "type", and "name" nouns all support = and != as operators. The "size", "atime", "mtime", and "ctime" nouns support = and !=, and >, >=, <, <= as well. The times are taken to be expressed in local time. Specify values for the file attributes as a string with one or more of the characters H,R,S,A,I,L in any order, implying file attributes of Hidden, ReadOnly, System, Archive, NotContextIndexed, and ReparsePoint (symbolic link) respectively. To specify a time, use YYYY-MM-DD-HH:mm:ss or YYYY/MM/DD-HH:mm:ss as the format. If you omit the HH:mm:ss portion, it is assumed to be 00:00:00 (midnight). The value for a size criterion is expressed in integer quantities of bytes, kilobytes (use k or kb after the number), megabytes (m or mb), or gigabytes (g or gb). The value for a name is a pattern to match against the filename, potentially including wildcards. The pattern follows CMD.exe glob rules: * implies one or more of any character, while ? implies one character. If the name pattern contains any slashes, it is matched to the entire filename, including the path; otherwise, it is matched against only the filename without the path. This means a pattern of "*\*.*" matches all files one directory level deep, while a pattern of "*.*" matches all files in all directories. To specify a name pattern that includes spaces, use single quotes around the pattern. A pattern of "'* *.*'" will match all files that have spaces in the filename. The full criteria string for that would be "name = '* *.*'" . The value for a type criterion is either F (implying a file) or D (implying a directory). Some examples: criteria Files retrieved name != *.xls any file with an extension that is not .xls name = *.mp3 any file with a .mp3 extension. *.mp3 (same as above) any file with a .mp3 extension. attributes = A all files whose attributes include the Archive bit. attributes != H all files whose attributes do not include the Hidden bit. mtime > 2009-01-01 all files with a last modified time after January 1st, 2009. ctime > 2009/01/01-03:00:00 all files with a created time after 3am (local time), on January 1st, 2009. size > 2gb all files whose uncompressed size is greater than 2gb. type = D all directories in the filesystem. You can combine criteria with the conjunctions AND, OR, and XOR. Using a string like "name = *.txt AND size >= 100k" for the selectionCriteria retrieves entries whose names end in .txt, and whose uncompressed size is greater than or equal to 100 kilobytes. For more complex combinations of criteria, you can use parenthesis to group clauses in the boolean logic. Absent parenthesis, the precedence of the criterion atoms is determined by order of appearance. Unlike the C# language, the AND conjunction does not take precendence over the logical OR. This is important only in strings that contain 3 or more criterion atoms. In other words, "name = *.txt and size > 1000 or attributes = H" implies "((name = *.txt AND size > 1000) OR attributes = H)" while "attributes = H OR name = *.txt and size > 1000" evaluates to "((attributes = H OR name = *.txt) AND size > 1000)". When in doubt, use parenthesis. Using time properties requires some extra care. If you want to retrieve all entries that were last updated on 2009 February 14, specify "mtime >= 2009-02-14 AND mtime < 2009-02-15". Read this to say: all files updated after 12:00am on February 14th, until 12:00am on February 15th. You can use the same bracketing approach to specify any time period - a year, a month, a week, and so on. The syntax allows one special case: if you provide a string with no spaces, it is treated as a pattern to match for the filename. Therefore a string like "*.xls" will be equivalent to specifying "name = *.xls". This "shorthand" notation does not work with compound criteria. There is no logic in this class that insures that the inclusion criteria are internally consistent. For example, it's possible to specify criteria that says the file must have a size of less than 100 bytes, as well as a size that is greater than 1000 bytes. Obviously no file will ever satisfy such criteria, but this class does not check for or detect such inconsistencies. Thrown in the setter if the value has an invalid syntax. Indicates whether searches will traverse NTFS reparse points, like Junctions. Returns a string representation of the FileSelector object. The string representation of the boolean logic statement of the file selection criteria for this instance. Returns the names of the files in the specified directory that fit the selection criteria specified in the FileSelector. This is equivalent to calling with recurseDirectories = false. The name of the directory over which to apply the FileSelector criteria. A collection of strings containing fully-qualified pathnames of files that match the criteria specified in the FileSelector instance. Returns the names of the files in the specified directory that fit the selection criteria specified in the FileSelector, optionally recursing through subdirectories. This method applies the file selection criteria contained in the FileSelector to the files contained in the given directory, and returns the names of files that conform to the criteria. The name of the directory over which to apply the FileSelector criteria. Whether to recurse through subdirectories when applying the file selection criteria. A collection of strings containing fully-qualified pathnames of files that match the criteria specified in the FileSelector instance. Retrieve the ZipEntry items in the ZipFile that conform to the specified criteria. This method applies the criteria set in the FileSelector instance (as described in the ) to the specified ZipFile. Using this method, for example, you can retrieve all entries from the given ZipFile that have filenames ending in .txt. Normally, applications would not call this method directly. This method is used by the ZipFile class. Using the appropriate SelectionCriteria, you can retrieve entries based on size, time, and attributes. See for a description of the syntax of the SelectionCriteria string. The ZipFile from which to retrieve entries. a collection of ZipEntry objects that conform to the criteria. Retrieve the ZipEntry items in the ZipFile that conform to the specified criteria. This method applies the criteria set in the FileSelector instance (as described in the ) to the specified ZipFile. Using this method, for example, you can retrieve all entries from the given ZipFile that have filenames ending in .txt. Normally, applications would not call this method directly. This method is used by the ZipFile class. This overload allows the selection of ZipEntry instances from the ZipFile to be restricted to entries contained within a particular directory in the ZipFile. Using the appropriate SelectionCriteria, you can retrieve entries based on size, time, and attributes. See for a description of the syntax of the SelectionCriteria string. The ZipFile from which to retrieve entries. the directory in the archive from which to select entries. If null, then all directories in the archive are used. a collection of ZipEntry objects that conform to the criteria. Summary description for EnumUtil. Returns the value of the DescriptionAttribute if the specified Enum value has one. If not, returns the ToString() representation of the Enum value. The Enum to get the description for Converts the string representation of the name or numeric value of one or more enumerated constants to an equivalent enumerated object. Note: use the DescriptionAttribute on enum values to enable this. The System.Type of the enumeration. A string containing the name or value to convert. Converts the string representation of the name or numeric value of one or more enumerated constants to an equivalent enumerated object. A parameter specified whether the operation is case-sensitive. Note: use the DescriptionAttribute on enum values to enable this. The System.Type of the enumeration. A string containing the name or value to convert. Whether the operation is case-sensitive or not. A class for compressing and decompressing streams using the Deflate algorithm. The DeflateStream is a Decorator on a . It adds DEFLATE compression or decompression to any stream. Using this stream, applications can compress or decompress data via stream Read and Write operations. Either compresssion or decompression can occur through either reading or writing. The compression format used is DEFLATE, which is documented in IETF RFC 1951, "DEFLATE Compressed Data Format Specification version 1.3.". This class is similar to , except that ZlibStream adds the RFC 1950 - ZLIB framing bytes to a compressed stream when compressing, or expects the RFC1950 framing bytes when decompressing. The DeflateStream does not. Create a DeflateStream using the specified CompressionMode. When mode is CompressionMode.Compress, the DeflateStream will use the default compression level. The "captive" stream will be closed when the DeflateStream is closed. This example uses a DeflateStream to compress data from a file, and writes the compressed data to another file. using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress)) { using (var raw = System.IO.File.Create(fileToCompress + ".deflated")) { using (Stream compressor = new DeflateStream(raw, CompressionMode.Compress)) { byte[] buffer = new byte[WORKING_BUFFER_SIZE]; int n; while ((n= input.Read(buffer, 0, buffer.Length)) != 0) { compressor.Write(buffer, 0, n); } } } } Using input As Stream = File.OpenRead(fileToCompress) Using raw As FileStream = File.Create(fileToCompress & ".deflated") Using compressor As Stream = New DeflateStream(raw, CompressionMode.Compress) Dim buffer As Byte() = New Byte(4096) {} Dim n As Integer = -1 Do While (n <> 0) If (n > 0) Then compressor.Write(buffer, 0, n) End If n = input.Read(buffer, 0, buffer.Length) Loop End Using End Using End Using The stream which will be read or written. Indicates whether the DeflateStream will compress or decompress. Create a DeflateStream using the specified CompressionMode and the specified CompressionLevel. When mode is CompressionMode.Decompress, the level parameter is ignored. The "captive" stream will be closed when the DeflateStream is closed. This example uses a DeflateStream to compress data from a file, and writes the compressed data to another file. using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress)) { using (var raw = System.IO.File.Create(fileToCompress + ".deflated")) { using (Stream compressor = new DeflateStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression)) { byte[] buffer = new byte[WORKING_BUFFER_SIZE]; int n= -1; while (n != 0) { if (n > 0) compressor.Write(buffer, 0, n); n= input.Read(buffer, 0, buffer.Length); } } } } Using input As Stream = File.OpenRead(fileToCompress) Using raw As FileStream = File.Create(fileToCompress & ".deflated") Using compressor As Stream = New DeflateStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression) Dim buffer As Byte() = New Byte(4096) {} Dim n As Integer = -1 Do While (n <> 0) If (n > 0) Then compressor.Write(buffer, 0, n) End If n = input.Read(buffer, 0, buffer.Length) Loop End Using End Using End Using The stream to be read or written while deflating or inflating. Indicates whether the DeflateStream will compress or decompress. A tuning knob to trade speed for effectiveness. Create a DeflateStream using the specified CompressionMode, and explicitly specify whether the stream should be left open after Deflation or Inflation. This constructor allows the application to request that the captive stream remain open after the deflation or inflation occurs. By default, after Close() is called on the stream, the captive stream is also closed. In some cases this is not desired, for example if the stream is a memory stream that will be re-read after compression. Specify true for the parameter to leave the stream open. The DeflateStream will use the default compression level. See the other overloads of this constructor for example code. The stream which will be read or written. This is called the "captive" stream in other places in this documentation. Indicates whether the DeflateStream will compress or decompress. true if the application would like the stream to remain open after inflation/deflation. Create a DeflateStream using the specified CompressionMode and the specified CompressionLevel, and explicitly specify whether the stream should be left open after Deflation or Inflation. When mode is CompressionMode.Decompress, the level parameter is ignored. This constructor allows the application to request that the captive stream remain open after the deflation or inflation occurs. By default, after Close() is called on the stream, the captive stream is also closed. In some cases this is not desired, for example if the stream is a that will be re-read after compression. Specify true for the parameter to leave the stream open. This example shows how to use a DeflateStream to compress data from a file, and store the compressed data into another file. using (var output = System.IO.File.Create(fileToCompress + ".deflated")) { using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress)) { using (Stream compressor = new DeflateStream(output, CompressionMode.Compress, CompressionLevel.BestCompression, true)) { byte[] buffer = new byte[WORKING_BUFFER_SIZE]; int n= -1; while (n != 0) { if (n > 0) compressor.Write(buffer, 0, n); n= input.Read(buffer, 0, buffer.Length); } } } // can write additional data to the output stream here } Using output As FileStream = File.Create(fileToCompress & ".deflated") Using input As Stream = File.OpenRead(fileToCompress) Using compressor As Stream = New DeflateStream(output, CompressionMode.Compress, CompressionLevel.BestCompression, True) Dim buffer As Byte() = New Byte(4096) {} Dim n As Integer = -1 Do While (n <> 0) If (n > 0) Then compressor.Write(buffer, 0, n) End If n = input.Read(buffer, 0, buffer.Length) Loop End Using End Using ' can write additional data to the output stream here. End Using The stream which will be read or written. Indicates whether the DeflateStream will compress or decompress. true if the application would like the stream to remain open after inflation/deflation. A tuning knob to trade speed for effectiveness. This property sets the flush behavior on the stream. See the ZLIB documentation for the meaning of the flush behavior. The size of the working buffer for the compression codec. The working buffer is used for all stream operations. The default size is 1024 bytes. The minimum size is 128 bytes. You may get better performance with a larger buffer. Then again, you might not. You would have to test it. Set this before the first call to Read() or Write() on the stream. If you try to set it afterwards, it will throw. The ZLIB strategy to be used during compression. By tweaking this parameter, you may be able to optimize the compression for data with particular characteristics. Returns the total number of bytes input so far. Returns the total number of bytes output so far. Dispose the stream. This may or may not result in a Close() call on the captive stream. See the constructors that have a leaveOpen parameter for more information. Application code won't call this code directly. This method may be invoked in two distinct scenarios. If disposing == true, the method has been called directly or indirectly by a user's code, for example via the public Dispose() method. In this case, both managed and unmanaged resources can be referenced and disposed. If disposing == false, the method has been called by the runtime from inside the object finalizer and this method should not reference other objects; in that case only unmanaged resources must be referenced or disposed. true if the Dispose method was invoked by user code. Indicates whether the stream can be read. The return value depends on whether the captive stream supports reading. Indicates whether the stream supports Seek operations. Always returns false. Indicates whether the stream can be written. The return value depends on whether the captive stream supports writing. Flush the stream. Reading this property always throws a . The position of the stream pointer. Setting this property always throws a . Reading will return the total bytes written out, if used in writing, or the total bytes read in, if used in reading. The count may refer to compressed bytes or uncompressed bytes, depending on how you've used the stream. Read data from the stream. If you wish to use the DeflateStream to compress data while reading, you can create a DeflateStream with CompressionMode.Compress, providing an uncompressed data stream. Then call Read() on that DeflateStream, and the data read will be compressed as you read. If you wish to use the DeflateStream to decompress data while reading, you can create a DeflateStream with CompressionMode.Decompress, providing a readable compressed data stream. Then call Read() on that DeflateStream, and the data read will be decompressed as you read. A DeflateStream can be used for Read() or Write(), but not both. The buffer into which the read data should be placed. the offset within that data array to put the first byte read. the number of bytes to read. the number of bytes actually read Calling this method always throws a . this is irrelevant, since it will always throw! this is irrelevant, since it will always throw! irrelevant! Calling this method always throws a . this is irrelevant, since it will always throw! Write data to the stream. If you wish to use the DeflateStream to compress data while writing, you can create a DeflateStream with CompressionMode.Compress, and a writable output stream. Then call Write() on that DeflateStream, providing uncompressed data as input. The data sent to the output stream will be the compressed form of the data written. If you wish to use the DeflateStream to decompress data while writing, you can create a DeflateStream with CompressionMode.Decompress, and a writable output stream. Then call Write() on that stream, providing previously compressed data. The data sent to the output stream will be the decompressed form of the data written. A DeflateStream can be used for Read() or Write(), but not both. The buffer holding data to write to the stream. the offset within that data array to find the first byte to write. the number of bytes to write. Compress a string into a byte array using DEFLATE (RFC 1951). Uncompress it with . DeflateStream.UncompressString(byte[]) DeflateStream.CompressBuffer(byte[]) GZipStream.CompressString(string) ZlibStream.CompressString(string) A string to compress. The string will first be encoded using UTF8, then compressed. The string in compressed form Compress a byte array into a new byte array using DEFLATE. Uncompress it with . DeflateStream.CompressString(string) DeflateStream.UncompressBuffer(byte[]) GZipStream.CompressBuffer(byte[]) ZlibStream.CompressBuffer(byte[]) A buffer to compress. The data in compressed form Uncompress a DEFLATE'd byte array into a single string. DeflateStream.CompressString(String) DeflateStream.UncompressBuffer(byte[]) GZipStream.UncompressString(byte[]) ZlibStream.UncompressString(byte[]) A buffer containing DEFLATE-compressed data. The uncompressed string Uncompress a DEFLATE'd byte array into a byte array. DeflateStream.CompressBuffer(byte[]) DeflateStream.UncompressString(byte[]) GZipStream.UncompressBuffer(byte[]) ZlibStream.UncompressBuffer(byte[]) A buffer containing data that has been compressed with DEFLATE. The data in uncompressed form A class for compressing and decompressing GZIP streams. The GZipStream is a Decorator on a . It adds GZIP compression or decompression to any stream. Like the System.IO.Compression.GZipStream in the .NET Base Class Library, the Ionic.Zlib.GZipStream can compress while writing, or decompress while reading, but not vice versa. The compression method used is GZIP, which is documented in IETF RFC 1952, "GZIP file format specification version 4.3". A GZipStream can be used to decompress data (through Read()) or to compress data (through Write()), but not both. If you wish to use the GZipStream to compress data, you must wrap it around a write-able stream. As you call Write() on the GZipStream, the data will be compressed into the GZIP format. If you want to decompress data, you must wrap the GZipStream around a readable stream that contains an IETF RFC 1952-compliant stream. The data will be decompressed as you call Read() on the GZipStream. Though the GZIP format allows data from multiple files to be concatenated together, this stream handles only a single segment of GZIP format, typically representing a single file. This class is similar to and . ZlibStream handles RFC1950-compliant streams. handles RFC1951-compliant streams. This class handles RFC1952-compliant streams. The comment on the GZIP stream. The GZIP format allows for each file to optionally have an associated comment stored with the file. The comment is encoded with the ISO-8859-1 code page. To include a comment in a GZIP stream you create, set this property before calling Write() for the first time on the GZipStream. When using GZipStream to decompress, you can retrieve this property after the first call to Read(). If no comment has been set in the GZIP bytestream, the Comment property will return null (Nothing in VB). The FileName for the GZIP stream. The GZIP format optionally allows each file to have an associated filename. When compressing data (through Write()), set this FileName before calling Write() the first time on the GZipStream. The actual filename is encoded into the GZIP bytestream with the ISO-8859-1 code page, according to RFC 1952. It is the application's responsibility to insure that the FileName can be encoded and decoded correctly with this code page. When decompressing (through Read()), you can retrieve this value any time after the first Read(). In the case where there was no filename encoded into the GZIP bytestream, the property will return null (Nothing in VB). The last modified time for the GZIP stream. GZIP allows the storage of a last modified time with each GZIP entry. When compressing data, you can set this before the first call to Write(). When decompressing, you can retrieve this value any time after the first call to Read(). The CRC on the GZIP stream. This is used for internal error checking. You probably don't need to look at this property. Create a GZipStream using the specified CompressionMode. When mode is CompressionMode.Compress, the GZipStream will use the default compression level. As noted in the class documentation, the CompressionMode (Compress or Decompress) also establishes the "direction" of the stream. A GZipStream with CompressionMode.Compress works only through Write(). A GZipStream with CompressionMode.Decompress works only through Read(). This example shows how to use a GZipStream to compress data. using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress)) { using (var raw = System.IO.File.Create(outputFile)) { using (Stream compressor = new GZipStream(raw, CompressionMode.Compress)) { byte[] buffer = new byte[WORKING_BUFFER_SIZE]; int n; while ((n= input.Read(buffer, 0, buffer.Length)) != 0) { compressor.Write(buffer, 0, n); } } } } Dim outputFile As String = (fileToCompress & ".compressed") Using input As Stream = File.OpenRead(fileToCompress) Using raw As FileStream = File.Create(outputFile) Using compressor As Stream = New GZipStream(raw, CompressionMode.Compress) Dim buffer As Byte() = New Byte(4096) {} Dim n As Integer = -1 Do While (n <> 0) If (n > 0) Then compressor.Write(buffer, 0, n) End If n = input.Read(buffer, 0, buffer.Length) Loop End Using End Using End Using This example shows how to use a GZipStream to uncompress a file. private void GunZipFile(string filename) { if (!filename.EndsWith(".gz)) throw new ArgumentException("filename"); var DecompressedFile = filename.Substring(0,filename.Length-3); byte[] working = new byte[WORKING_BUFFER_SIZE]; int n= 1; using (System.IO.Stream input = System.IO.File.OpenRead(filename)) { using (Stream decompressor= new Ionic.Zlib.GZipStream(input, CompressionMode.Decompress, true)) { using (var output = System.IO.File.Create(DecompressedFile)) { while (n !=0) { n= decompressor.Read(working, 0, working.Length); if (n > 0) { output.Write(working, 0, n); } } } } } } Private Sub GunZipFile(ByVal filename as String) If Not (filename.EndsWith(".gz)) Then Throw New ArgumentException("filename") End If Dim DecompressedFile as String = filename.Substring(0,filename.Length-3) Dim working(WORKING_BUFFER_SIZE) as Byte Dim n As Integer = 1 Using input As Stream = File.OpenRead(filename) Using decompressor As Stream = new Ionic.Zlib.GZipStream(input, CompressionMode.Decompress, True) Using output As Stream = File.Create(UncompressedFile) Do n= decompressor.Read(working, 0, working.Length) If n > 0 Then output.Write(working, 0, n) End IF Loop While (n > 0) End Using End Using End Using End Sub The stream which will be read or written. Indicates whether the GZipStream will compress or decompress. Create a GZipStream using the specified CompressionMode and the specified CompressionLevel. The CompressionMode (Compress or Decompress) also establishes the "direction" of the stream. A GZipStream with CompressionMode.Compress works only through Write(). A GZipStream with CompressionMode.Decompress works only through Read(). This example shows how to use a GZipStream to compress a file into a .gz file. using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress)) { using (var raw = System.IO.File.Create(fileToCompress + ".gz")) { using (Stream compressor = new GZipStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression)) { byte[] buffer = new byte[WORKING_BUFFER_SIZE]; int n; while ((n= input.Read(buffer, 0, buffer.Length)) != 0) { compressor.Write(buffer, 0, n); } } } } Using input As Stream = File.OpenRead(fileToCompress) Using raw As FileStream = File.Create(fileToCompress & ".gz") Using compressor As Stream = New GZipStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression) Dim buffer As Byte() = New Byte(4096) {} Dim n As Integer = -1 Do While (n <> 0) If (n > 0) Then compressor.Write(buffer, 0, n) End If n = input.Read(buffer, 0, buffer.Length) Loop End Using End Using End Using The stream to be read or written while deflating or inflating. Indicates whether the GZipStream will compress or decompress. A tuning knob to trade speed for effectiveness. Create a GZipStream using the specified CompressionMode, and explicitly specify whether the stream should be left open after Deflation or Inflation. This constructor allows the application to request that the captive stream remain open after the deflation or inflation occurs. By default, after Close() is called on the stream, the captive stream is also closed. In some cases this is not desired, for example if the stream is a memory stream that will be re-read after compressed data has been written to it. Specify true for the parameter to leave the stream open. The (Compress or Decompress) also establishes the "direction" of the stream. A GZipStream with CompressionMode.Compress works only through Write(). A GZipStream with CompressionMode.Decompress works only through Read(). The GZipStream will use the default compression level. If you want to specify the compression level, see . See the other overloads of this constructor for example code. The stream which will be read or written. This is called the "captive" stream in other places in this documentation. Indicates whether the GZipStream will compress or decompress. true if the application would like the base stream to remain open after inflation/deflation. Create a GZipStream using the specified CompressionMode and the specified CompressionLevel, and explicitly specify whether the stream should be left open after Deflation or Inflation. This constructor allows the application to request that the captive stream remain open after the deflation or inflation occurs. By default, after Close() is called on the stream, the captive stream is also closed. In some cases this is not desired, for example if the stream is a memory stream that will be re-read after compressed data has been written to it. Specify true for the parameter to leave the stream open. As noted in the class documentation, the CompressionMode (Compress or Decompress) also establishes the "direction" of the stream. A GZipStream with CompressionMode.Compress works only through Write(). A GZipStream with CompressionMode.Decompress works only through Read(). This example shows how to use a GZipStream to compress data. using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress)) { using (var raw = System.IO.File.Create(outputFile)) { using (Stream compressor = new GZipStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression, true)) { byte[] buffer = new byte[WORKING_BUFFER_SIZE]; int n; while ((n= input.Read(buffer, 0, buffer.Length)) != 0) { compressor.Write(buffer, 0, n); } } } } Dim outputFile As String = (fileToCompress & ".compressed") Using input As Stream = File.OpenRead(fileToCompress) Using raw As FileStream = File.Create(outputFile) Using compressor As Stream = New GZipStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression, True) Dim buffer As Byte() = New Byte(4096) {} Dim n As Integer = -1 Do While (n <> 0) If (n > 0) Then compressor.Write(buffer, 0, n) End If n = input.Read(buffer, 0, buffer.Length) Loop End Using End Using End Using The stream which will be read or written. Indicates whether the GZipStream will compress or decompress. true if the application would like the stream to remain open after inflation/deflation. A tuning knob to trade speed for effectiveness. This property sets the flush behavior on the stream. The size of the working buffer for the compression codec. The working buffer is used for all stream operations. The default size is 1024 bytes. The minimum size is 128 bytes. You may get better performance with a larger buffer. Then again, you might not. You would have to test it. Set this before the first call to Read() or Write() on the stream. If you try to set it afterwards, it will throw. Returns the total number of bytes input so far. Returns the total number of bytes output so far. Dispose the stream. This may or may not result in a Close() call on the captive stream. See the constructors that have a leaveOpen parameter for more information. This method may be invoked in two distinct scenarios. If disposing == true, the method has been called directly or indirectly by a user's code, for example via the public Dispose() method. In this case, both managed and unmanaged resources can be referenced and disposed. If disposing == false, the method has been called by the runtime from inside the object finalizer and this method should not reference other objects; in that case only unmanaged resources must be referenced or disposed. indicates whether the Dispose method was invoked by user code. Indicates whether the stream can be read. The return value depends on whether the captive stream supports reading. Indicates whether the stream supports Seek operations. Always returns false. Indicates whether the stream can be written. The return value depends on whether the captive stream supports writing. Flush the stream. Reading this property always throws a . The position of the stream pointer. Setting this property always throws a . Reading will return the total bytes written out, if used in writing, or the total bytes read in, if used in reading. The count may refer to compressed bytes or uncompressed bytes, depending on how you've used the stream. Read and decompress data from the source stream. With a GZipStream, decompression is done through reading. byte[] working = new byte[WORKING_BUFFER_SIZE]; using (System.IO.Stream input = System.IO.File.OpenRead(_CompressedFile)) { using (Stream decompressor= new Ionic.Zlib.GZipStream(input, CompressionMode.Decompress, true)) { using (var output = System.IO.File.Create(_DecompressedFile)) { int n; while ((n= decompressor.Read(working, 0, working.Length)) !=0) { output.Write(working, 0, n); } } } } The buffer into which the decompressed data should be placed. the offset within that data array to put the first byte read. the number of bytes to read. the number of bytes actually read Calling this method always throws a . irrelevant; it will always throw! irrelevant; it will always throw! irrelevant! Calling this method always throws a . irrelevant; this method will always throw! Write data to the stream. If you wish to use the GZipStream to compress data while writing, you can create a GZipStream with CompressionMode.Compress, and a writable output stream. Then call Write() on that GZipStream, providing uncompressed data as input. The data sent to the output stream will be the compressed form of the data written. A GZipStream can be used for Read() or Write(), but not both. Writing implies compression. Reading implies decompression. The buffer holding data to write to the stream. the offset within that data array to find the first byte to write. the number of bytes to write. Compress a string into a byte array using GZip. Uncompress it with . A string to compress. The string will first be encoded using UTF8, then compressed. The string in compressed form Compress a byte array into a new byte array using GZip. Uncompress it with . A buffer to compress. The data in compressed form Uncompress a GZip'ed byte array into a single string. A buffer containing GZIP-compressed data. The uncompressed string Uncompress a GZip'ed byte array into a byte array. A buffer containing data that has been compressed with GZip. The data in uncompressed form A class for compressing streams using the Deflate algorithm with multiple threads. This class performs DEFLATE compression through writing. For more information on the Deflate algorithm, see IETF RFC 1951, "DEFLATE Compressed Data Format Specification version 1.3." This class is similar to , except that this class is for compression only, and this implementation uses an approach that employs multiple worker threads to perform the DEFLATE. On a multi-cpu or multi-core computer, the performance of this class can be significantly higher than the single-threaded DeflateStream, particularly for larger streams. How large? Anything over 10mb is a good candidate for parallel compression. The tradeoff is that this class uses more memory and more CPU than the vanilla DeflateStream, and also is less efficient as a compressor. For large files the size of the compressed data stream can be less than 1% larger than the size of a compressed data stream from the vanialla DeflateStream. For smaller files the difference can be larger. The difference will also be larger if you set the BufferSize to be lower than the default value. Your mileage may vary. Finally, for small files, the ParallelDeflateOutputStream can be much slower than the vanilla DeflateStream, because of the overhead associated to using the thread pool. Create a ParallelDeflateOutputStream. This stream compresses data written into it via the DEFLATE algorithm (see RFC 1951), and writes out the compressed byte stream. The instance will use the default compression level, the default buffer sizes and the default number of threads and buffers per thread. This class is similar to , except that this implementation uses an approach that employs multiple worker threads to perform the DEFLATE. On a multi-cpu or multi-core computer, the performance of this class can be significantly higher than the single-threaded DeflateStream, particularly for larger streams. How large? Anything over 10mb is a good candidate for parallel compression. This example shows how to use a ParallelDeflateOutputStream to compress data. It reads a file, compresses it, and writes the compressed data to a second, output file. byte[] buffer = new byte[WORKING_BUFFER_SIZE]; int n= -1; String outputFile = fileToCompress + ".compressed"; using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress)) { using (var raw = System.IO.File.Create(outputFile)) { using (Stream compressor = new ParallelDeflateOutputStream(raw)) { while ((n= input.Read(buffer, 0, buffer.Length)) != 0) { compressor.Write(buffer, 0, n); } } } } Dim buffer As Byte() = New Byte(4096) {} Dim n As Integer = -1 Dim outputFile As String = (fileToCompress & ".compressed") Using input As Stream = File.OpenRead(fileToCompress) Using raw As FileStream = File.Create(outputFile) Using compressor As Stream = New ParallelDeflateOutputStream(raw) Do While (n <> 0) If (n > 0) Then compressor.Write(buffer, 0, n) End If n = input.Read(buffer, 0, buffer.Length) Loop End Using End Using End Using The stream to which compressed data will be written. Create a ParallelDeflateOutputStream using the specified CompressionLevel. See the constructor for example code. The stream to which compressed data will be written. A tuning knob to trade speed for effectiveness. Create a ParallelDeflateOutputStream and specify whether to leave the captive stream open when the ParallelDeflateOutputStream is closed. See the constructor for example code. The stream to which compressed data will be written. true if the application would like the stream to remain open after inflation/deflation. Create a ParallelDeflateOutputStream and specify whether to leave the captive stream open when the ParallelDeflateOutputStream is closed. See the constructor for example code. The stream to which compressed data will be written. A tuning knob to trade speed for effectiveness. true if the application would like the stream to remain open after inflation/deflation. Create a ParallelDeflateOutputStream using the specified CompressionLevel and CompressionStrategy, and specifying whether to leave the captive stream open when the ParallelDeflateOutputStream is closed. See the constructor for example code. The stream to which compressed data will be written. A tuning knob to trade speed for effectiveness. By tweaking this parameter, you may be able to optimize the compression for data with particular characteristics. true if the application would like the stream to remain open after inflation/deflation. The ZLIB strategy to be used during compression. The maximum number of buffer pairs to use. This property sets an upper limit on the number of memory buffer pairs to create. The implementation of this stream allocates multiple buffers to facilitate parallel compression. As each buffer fills up, this stream uses ThreadPool.QueueUserWorkItem() to compress those buffers in a background threadpool thread. After a buffer is compressed, it is re-ordered and written to the output stream. A higher number of buffer pairs enables a higher degree of parallelism, which tends to increase the speed of compression on multi-cpu computers. On the other hand, a higher number of buffer pairs also implies a larger memory consumption, more active worker threads, and a higher cpu utilization for any compression. This property enables the application to limit its memory consumption and CPU utilization behavior depending on requirements. For each compression "task" that occurs in parallel, there are 2 buffers allocated: one for input and one for output. This property sets a limit for the number of pairs. The total amount of storage space allocated for buffering will then be (N*S*2), where N is the number of buffer pairs, S is the size of each buffer (). By default, DotNetZip allocates 4 buffer pairs per CPU core, so if your machine has 4 cores, and you retain the default buffer size of 128k, then the ParallelDeflateOutputStream will use 4 * 4 * 2 * 128kb of buffer memory in total, or 4mb, in blocks of 128kb. If you then set this property to 8, then the number will be 8 * 2 * 128kb of buffer memory, or 2mb. CPU utilization will also go up with additional buffers, because a larger number of buffer pairs allows a larger number of background threads to compress in parallel. If you find that parallel compression is consuming too much memory or CPU, you can adjust this value downward. The default value is 16. Different values may deliver better or worse results, depending on your priorities and the dynamic performance characteristics of your storage and compute resources. This property is not the number of buffer pairs to use; it is an upper limit. An illustration: Suppose you have an application that uses the default value of this property (which is 16), and it runs on a machine with 2 CPU cores. In that case, DotNetZip will allocate 4 buffer pairs per CPU core, for a total of 8 pairs. The upper limit specified by this property has no effect. The application can set this value at any time, but it is effective only before the first call to Write(), which is when the buffers are allocated. The size of the buffers used by the compressor threads. The default buffer size is 128k. The application can set this value at any time, but it is effective only before the first Write(). Larger buffer sizes implies larger memory consumption but allows more efficient compression. Using smaller buffer sizes consumes less memory but may result in less effective compression. For example, using the default buffer size of 128k, the compression delivered is within 1% of the compression delivered by the single-threaded . On the other hand, using a BufferSize of 8k can result in a compressed data stream that is 5% larger than that delivered by the single-threaded DeflateStream. Excessively small buffer sizes can also cause the speed of the ParallelDeflateOutputStream to drop, because of larger thread scheduling overhead dealing with many many small buffers. The total amount of storage space allocated for buffering will be (N*S*2), where N is the number of buffer pairs, and S is the size of each buffer (this property). There are 2 buffers used by the compressor, one for input and one for output. By default, DotNetZip allocates 4 buffer pairs per CPU core, so if your machine has 4 cores, then the number of buffer pairs used will be 16. If you accept the default value of this property, 128k, then the ParallelDeflateOutputStream will use 16 * 2 * 128kb of buffer memory in total, or 4mb, in blocks of 128kb. If you set this property to 64kb, then the number will be 16 * 2 * 64kb of buffer memory, or 2mb. The CRC32 for the data that was written out, prior to compression. This value is meaningful only after a call to Close(). The total number of uncompressed bytes processed by the ParallelDeflateOutputStream. This value is meaningful only after a call to Close(). Write data to the stream. To use the ParallelDeflateOutputStream to compress data, create a ParallelDeflateOutputStream with CompressionMode.Compress, passing a writable output stream. Then call Write() on that ParallelDeflateOutputStream, providing uncompressed data as input. The data sent to the output stream will be the compressed form of the data written. To decompress data, use the class. The buffer holding data to write to the stream. the offset within that data array to find the first byte to write. the number of bytes to write. Flush the stream. Close the stream. You must call Close on the stream to guarantee that all of the data written in has been compressed, and the compressed data has been written out. Dispose the object Because ParallelDeflateOutputStream is IDisposable, the application must call this method when finished using the instance. This method is generally called implicitly upon exit from a using scope in C# (Using in VB). The Dispose method indicates whether the Dispose method was invoked by user code. Resets the stream for use with another stream. Because the ParallelDeflateOutputStream is expensive to create, it has been designed so that it can be recycled and re-used. You have to call Close() on the stream first, then you can call Reset() on it, to use it again on another stream. The new output stream for this era. ParallelDeflateOutputStream deflater = null; foreach (var inputFile in listOfFiles) { string outputFile = inputFile + ".compressed"; using (System.IO.Stream input = System.IO.File.OpenRead(inputFile)) { using (var outStream = System.IO.File.Create(outputFile)) { if (deflater == null) deflater = new ParallelDeflateOutputStream(outStream, CompressionLevel.Best, CompressionStrategy.Default, true); deflater.Reset(outStream); while ((n= input.Read(buffer, 0, buffer.Length)) != 0) { deflater.Write(buffer, 0, n); } } } } Indicates whether the stream supports Seek operations. Always returns false. Indicates whether the stream supports Read operations. Always returns false. Indicates whether the stream supports Write operations. Returns true if the provided stream is writable. Reading this property always throws a NotSupportedException. Returns the current position of the output stream. Because the output gets written by a background thread, the value may change asynchronously. Setting this property always throws a NotSupportedException. This method always throws a NotSupportedException. The buffer into which data would be read, IF THIS METHOD ACTUALLY DID ANYTHING. The offset within that data array at which to insert the data that is read, IF THIS METHOD ACTUALLY DID ANYTHING. The number of bytes to write, IF THIS METHOD ACTUALLY DID ANYTHING. nothing. This method always throws a NotSupportedException. The offset to seek to.... IF THIS METHOD ACTUALLY DID ANYTHING. The reference specifying how to apply the offset.... IF THIS METHOD ACTUALLY DID ANYTHING. nothing. It always throws. This method always throws a NotSupportedException. The new value for the stream length.... IF THIS METHOD ACTUALLY DID ANYTHING. Map from a distance to a distance code. No side effects. _dist_code[256] and _dist_code[257] are never used. Describes how to flush the current deflate operation. The different FlushType values are useful when using a Deflate in a streaming application. No flush at all. Closes the current block, but doesn't flush it to the output. Used internally only in hypothetical scenarios. This was supposed to be removed by Zlib, but it is still in use in some edge cases. Use this during compression to specify that all pending output should be flushed to the output buffer and the output should be aligned on a byte boundary. You might use this in a streaming communication scenario, so that the decompressor can get all input data available so far. When using this with a ZlibCodec, AvailableBytesIn will be zero after the call if enough output space has been provided before the call. Flushing will degrade compression and so it should be used only when necessary. Use this during compression to specify that all output should be flushed, as with FlushType.Sync, but also, the compression state should be reset so that decompression can restart from this point if previous compressed data has been damaged or if random access is desired. Using FlushType.Full too often can significantly degrade the compression. Signals the end of the compression/decompression stream. The compression level to be used when using a DeflateStream or ZlibStream with CompressionMode.Compress. None means that the data will be simply stored, with no change at all. If you are producing ZIPs for use on Mac OSX, be aware that archives produced with CompressionLevel.None cannot be opened with the default zip reader. Use a different CompressionLevel. Same as None. The fastest but least effective compression. A synonym for BestSpeed. A little slower, but better, than level 1. A little slower, but better, than level 2. A little slower, but better, than level 3. A little slower than level 4, but with better compression. The default compression level, with a good balance of speed and compression efficiency. A synonym for Default. Pretty good compression! Better compression than Level7! The "best" compression, where best means greatest reduction in size of the input data stream. This is also the slowest compression. A synonym for BestCompression. Describes options for how the compression algorithm is executed. Different strategies work better on different sorts of data. The strategy parameter can affect the compression ratio and the speed of compression but not the correctness of the compresssion. The default strategy is probably the best for normal data. The Filtered strategy is intended to be used most effectively with data produced by a filter or predictor. By this definition, filtered data consists mostly of small values with a somewhat random distribution. In this case, the compression algorithm is tuned to compress them better. The effect of Filtered is to force more Huffman coding and less string matching; it is a half-step between Default and HuffmanOnly. Using HuffmanOnly will force the compressor to do Huffman encoding only, with no string matching. An enum to specify the direction of transcoding - whether to compress or decompress. Used to specify that the stream should compress the data. Used to specify that the stream should decompress the data. A general purpose exception class for exceptions in the Zlib library. The ZlibException class captures exception information generated by the Zlib library. This ctor collects a message attached to the exception. the message for the exception. Performs an unsigned bitwise right shift with the specified number Number to operate on Ammount of bits to shift The resulting number from the shift operation Reads a number of characters from the current source TextReader and writes the data to the target array at the specified index. The source TextReader to read from Contains the array of characteres read from the source TextReader. The starting index of the target array. The maximum number of characters to read from the source TextReader. The number of characters read. The number will be less than or equal to count depending on the data available in the source TextReader. Returns -1 if the end of the stream is reached. Computes an Adler-32 checksum. The Adler checksum is similar to a CRC checksum, but faster to compute, though less reliable. It is used in producing RFC1950 compressed streams. The Adler checksum is a required part of the "ZLIB" standard. Applications will almost never need to use this class directly. Calculates the Adler32 checksum. This is used within ZLIB. You probably don't need to use this directly. To compute an Adler32 checksum on a byte array: var adler = Adler.Adler32(0, null, 0, 0); adler = Adler.Adler32(adler, buffer, index, length); Encoder and Decoder for ZLIB and DEFLATE (IETF RFC1950 and RFC1951). This class compresses and decompresses data according to the Deflate algorithm and optionally, the ZLIB format, as documented in RFC 1950 - ZLIB and RFC 1951 - DEFLATE. The buffer from which data is taken. An index into the InputBuffer array, indicating where to start reading. The number of bytes available in the InputBuffer, starting at NextIn. Generally you should set this to InputBuffer.Length before the first Inflate() or Deflate() call. The class will update this number as calls to Inflate/Deflate are made. Total number of bytes read so far, through all calls to Inflate()/Deflate(). Buffer to store output data. An index into the OutputBuffer array, indicating where to start writing. The number of bytes available in the OutputBuffer, starting at NextOut. Generally you should set this to OutputBuffer.Length before the first Inflate() or Deflate() call. The class will update this number as calls to Inflate/Deflate are made. Total number of bytes written to the output so far, through all calls to Inflate()/Deflate(). used for diagnostics, when something goes wrong! The compression level to use in this codec. Useful only in compression mode. The number of Window Bits to use. This gauges the size of the sliding window, and hence the compression effectiveness as well as memory consumption. It's best to just leave this setting alone if you don't know what it is. The maximum value is 15 bits, which implies a 32k window. The compression strategy to use. This is only effective in compression. The theory offered by ZLIB is that different strategies could potentially produce significant differences in compression behavior for different data sets. Unfortunately I don't have any good recommendations for how to set it differently. When I tested changing the strategy I got minimally different compression performance. It's best to leave this property alone if you don't have a good feel for it. Or, you may want to produce a test harness that runs through the different strategy options and evaluates them on different file types. If you do that, let me know your results. The Adler32 checksum on the data transferred through the codec so far. You probably don't need to look at this. Create a ZlibCodec. If you use this default constructor, you will later have to explicitly call InitializeInflate() or InitializeDeflate() before using the ZlibCodec to compress or decompress. Create a ZlibCodec that either compresses or decompresses. Indicates whether the codec should compress (deflate) or decompress (inflate). Initialize the inflation state. It is not necessary to call this before using the ZlibCodec to inflate data; It is implicitly called when you call the constructor. Z_OK if everything goes well. Initialize the inflation state with an explicit flag to govern the handling of RFC1950 header bytes. By default, the ZLIB header defined in RFC 1950 is expected. If you want to read a zlib stream you should specify true for expectRfc1950Header. If you have a deflate stream, you will want to specify false. It is only necessary to invoke this initializer explicitly if you want to specify false. whether to expect an RFC1950 header byte pair when reading the stream of data to be inflated. Z_OK if everything goes well. Initialize the ZlibCodec for inflation, with the specified number of window bits. The number of window bits to use. If you need to ask what that is, then you shouldn't be calling this initializer. Z_OK if all goes well. Initialize the inflation state with an explicit flag to govern the handling of RFC1950 header bytes. If you want to read a zlib stream you should specify true for expectRfc1950Header. In this case, the library will expect to find a ZLIB header, as defined in RFC 1950, in the compressed stream. If you will be reading a DEFLATE or GZIP stream, which does not have such a header, you will want to specify false. whether to expect an RFC1950 header byte pair when reading the stream of data to be inflated. The number of window bits to use. If you need to ask what that is, then you shouldn't be calling this initializer. Z_OK if everything goes well. Inflate the data in the InputBuffer, placing the result in the OutputBuffer. You must have set InputBuffer and OutputBuffer, NextIn and NextOut, and AvailableBytesIn and AvailableBytesOut before calling this method. private void InflateBuffer() { int bufferSize = 1024; byte[] buffer = new byte[bufferSize]; ZlibCodec decompressor = new ZlibCodec(); Console.WriteLine("\n============================================"); Console.WriteLine("Size of Buffer to Inflate: {0} bytes.", CompressedBytes.Length); MemoryStream ms = new MemoryStream(DecompressedBytes); int rc = decompressor.InitializeInflate(); decompressor.InputBuffer = CompressedBytes; decompressor.NextIn = 0; decompressor.AvailableBytesIn = CompressedBytes.Length; decompressor.OutputBuffer = buffer; // pass 1: inflate do { decompressor.NextOut = 0; decompressor.AvailableBytesOut = buffer.Length; rc = decompressor.Inflate(FlushType.None); if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END) throw new Exception("inflating: " + decompressor.Message); ms.Write(decompressor.OutputBuffer, 0, buffer.Length - decompressor.AvailableBytesOut); } while (decompressor.AvailableBytesIn > 0 || decompressor.AvailableBytesOut == 0); // pass 2: finish and flush do { decompressor.NextOut = 0; decompressor.AvailableBytesOut = buffer.Length; rc = decompressor.Inflate(FlushType.Finish); if (rc != ZlibConstants.Z_STREAM_END && rc != ZlibConstants.Z_OK) throw new Exception("inflating: " + decompressor.Message); if (buffer.Length - decompressor.AvailableBytesOut > 0) ms.Write(buffer, 0, buffer.Length - decompressor.AvailableBytesOut); } while (decompressor.AvailableBytesIn > 0 || decompressor.AvailableBytesOut == 0); decompressor.EndInflate(); } The flush to use when inflating. Z_OK if everything goes well. Ends an inflation session. Call this after successively calling Inflate(). This will cause all buffers to be flushed. After calling this you cannot call Inflate() without a intervening call to one of the InitializeInflate() overloads. Z_OK if everything goes well. I don't know what this does! Z_OK if everything goes well. Initialize the ZlibCodec for deflation operation. The codec will use the MAX window bits and the default level of compression. int bufferSize = 40000; byte[] CompressedBytes = new byte[bufferSize]; byte[] DecompressedBytes = new byte[bufferSize]; ZlibCodec compressor = new ZlibCodec(); compressor.InitializeDeflate(CompressionLevel.Default); compressor.InputBuffer = System.Text.ASCIIEncoding.ASCII.GetBytes(TextToCompress); compressor.NextIn = 0; compressor.AvailableBytesIn = compressor.InputBuffer.Length; compressor.OutputBuffer = CompressedBytes; compressor.NextOut = 0; compressor.AvailableBytesOut = CompressedBytes.Length; while (compressor.TotalBytesIn != TextToCompress.Length && compressor.TotalBytesOut < bufferSize) { compressor.Deflate(FlushType.None); } while (true) { int rc= compressor.Deflate(FlushType.Finish); if (rc == ZlibConstants.Z_STREAM_END) break; } compressor.EndDeflate(); Z_OK if all goes well. You generally don't need to check the return code. Initialize the ZlibCodec for deflation operation, using the specified CompressionLevel. The codec will use the maximum window bits (15) and the specified CompressionLevel. It will emit a ZLIB stream as it compresses. The compression level for the codec. Z_OK if all goes well. Initialize the ZlibCodec for deflation operation, using the specified CompressionLevel, and the explicit flag governing whether to emit an RFC1950 header byte pair. The codec will use the maximum window bits (15) and the specified CompressionLevel. If you want to generate a zlib stream, you should specify true for wantRfc1950Header. In this case, the library will emit a ZLIB header, as defined in RFC 1950, in the compressed stream. The compression level for the codec. whether to emit an initial RFC1950 byte pair in the compressed stream. Z_OK if all goes well. Initialize the ZlibCodec for deflation operation, using the specified CompressionLevel, and the specified number of window bits. The codec will use the specified number of window bits and the specified CompressionLevel. The compression level for the codec. the number of window bits to use. If you don't know what this means, don't use this method. Z_OK if all goes well. Initialize the ZlibCodec for deflation operation, using the specified CompressionLevel, the specified number of window bits, and the explicit flag governing whether to emit an RFC1950 header byte pair. The compression level for the codec. whether to emit an initial RFC1950 byte pair in the compressed stream. the number of window bits to use. If you don't know what this means, don't use this method. Z_OK if all goes well. Deflate one batch of data. You must have set InputBuffer and OutputBuffer before calling this method. private void DeflateBuffer(CompressionLevel level) { int bufferSize = 1024; byte[] buffer = new byte[bufferSize]; ZlibCodec compressor = new ZlibCodec(); Console.WriteLine("\n============================================"); Console.WriteLine("Size of Buffer to Deflate: {0} bytes.", UncompressedBytes.Length); MemoryStream ms = new MemoryStream(); int rc = compressor.InitializeDeflate(level); compressor.InputBuffer = UncompressedBytes; compressor.NextIn = 0; compressor.AvailableBytesIn = UncompressedBytes.Length; compressor.OutputBuffer = buffer; // pass 1: deflate do { compressor.NextOut = 0; compressor.AvailableBytesOut = buffer.Length; rc = compressor.Deflate(FlushType.None); if (rc != ZlibConstants.Z_OK && rc != ZlibConstants.Z_STREAM_END) throw new Exception("deflating: " + compressor.Message); ms.Write(compressor.OutputBuffer, 0, buffer.Length - compressor.AvailableBytesOut); } while (compressor.AvailableBytesIn > 0 || compressor.AvailableBytesOut == 0); // pass 2: finish and flush do { compressor.NextOut = 0; compressor.AvailableBytesOut = buffer.Length; rc = compressor.Deflate(FlushType.Finish); if (rc != ZlibConstants.Z_STREAM_END && rc != ZlibConstants.Z_OK) throw new Exception("deflating: " + compressor.Message); if (buffer.Length - compressor.AvailableBytesOut > 0) ms.Write(buffer, 0, buffer.Length - compressor.AvailableBytesOut); } while (compressor.AvailableBytesIn > 0 || compressor.AvailableBytesOut == 0); compressor.EndDeflate(); ms.Seek(0, SeekOrigin.Begin); CompressedBytes = new byte[compressor.TotalBytesOut]; ms.Read(CompressedBytes, 0, CompressedBytes.Length); } whether to flush all data as you deflate. Generally you will want to use Z_NO_FLUSH here, in a series of calls to Deflate(), and then call EndDeflate() to flush everything. Z_OK if all goes well. End a deflation session. Call this after making a series of one or more calls to Deflate(). All buffers are flushed. Z_OK if all goes well. Reset a codec for another deflation session. Call this to reset the deflation state. For example if a thread is deflating non-consecutive blocks, you can call Reset() after the Deflate(Sync) of the first block and before the next Deflate(None) of the second block. Z_OK if all goes well. Set the CompressionStrategy and CompressionLevel for a deflation session. the level of compression to use. the strategy to use for compression. Z_OK if all goes well. Set the dictionary to be used for either Inflation or Deflation. The dictionary bytes to use. Z_OK if all goes well. A bunch of constants used in the Zlib interface. The maximum number of window bits for the Deflate algorithm. The default number of window bits for the Deflate algorithm. indicates everything is A-OK Indicates that the last operation reached the end of the stream. The operation ended in need of a dictionary. There was an error with the stream - not enough data, not open and readable, etc. There was an error with the data - not enough data, bad data, etc. There was an error with the working buffer. The size of the working buffer used in the ZlibCodec class. Defaults to 8192 bytes. The minimum size of the working buffer used in the ZlibCodec class. Currently it is 128 bytes. Represents a Zlib stream for compression or decompression. The ZlibStream is a Decorator on a . It adds ZLIB compression or decompression to any stream. Using this stream, applications can compress or decompress data via stream Read() and Write() operations. Either compresssion or decompression can occur through either reading or writing. The compression format used is ZLIB, which is documented in IETF RFC 1950, "ZLIB Compressed Data Format Specification version 3.3". This implementation of ZLIB always uses DEFLATE as the compression method. (see IETF RFC 1951, "DEFLATE Compressed Data Format Specification version 1.3.") The ZLIB format allows for varying compression methods, window sizes, and dictionaries. This implementation always uses the DEFLATE compression method, a preset dictionary, and 15 window bits by default. This class is similar to , except that it adds the RFC1950 header and trailer bytes to a compressed stream when compressing, or expects the RFC1950 header and trailer bytes when decompressing. It is also similar to the . Create a ZlibStream using the specified CompressionMode. When mode is CompressionMode.Compress, the ZlibStream will use the default compression level. The "captive" stream will be closed when the ZlibStream is closed. This example uses a ZlibStream to compress a file, and writes the compressed data to another file. using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress)) { using (var raw = System.IO.File.Create(fileToCompress + ".zlib")) { using (Stream compressor = new ZlibStream(raw, CompressionMode.Compress)) { byte[] buffer = new byte[WORKING_BUFFER_SIZE]; int n; while ((n= input.Read(buffer, 0, buffer.Length)) != 0) { compressor.Write(buffer, 0, n); } } } } Using input As Stream = File.OpenRead(fileToCompress) Using raw As FileStream = File.Create(fileToCompress & ".zlib") Using compressor As Stream = New ZlibStream(raw, CompressionMode.Compress) Dim buffer As Byte() = New Byte(4096) {} Dim n As Integer = -1 Do While (n <> 0) If (n > 0) Then compressor.Write(buffer, 0, n) End If n = input.Read(buffer, 0, buffer.Length) Loop End Using End Using End Using The stream which will be read or written. Indicates whether the ZlibStream will compress or decompress. Create a ZlibStream using the specified CompressionMode and the specified CompressionLevel. When mode is CompressionMode.Decompress, the level parameter is ignored. The "captive" stream will be closed when the ZlibStream is closed. This example uses a ZlibStream to compress data from a file, and writes the compressed data to another file. using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress)) { using (var raw = System.IO.File.Create(fileToCompress + ".zlib")) { using (Stream compressor = new ZlibStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression)) { byte[] buffer = new byte[WORKING_BUFFER_SIZE]; int n; while ((n= input.Read(buffer, 0, buffer.Length)) != 0) { compressor.Write(buffer, 0, n); } } } } Using input As Stream = File.OpenRead(fileToCompress) Using raw As FileStream = File.Create(fileToCompress & ".zlib") Using compressor As Stream = New ZlibStream(raw, CompressionMode.Compress, CompressionLevel.BestCompression) Dim buffer As Byte() = New Byte(4096) {} Dim n As Integer = -1 Do While (n <> 0) If (n > 0) Then compressor.Write(buffer, 0, n) End If n = input.Read(buffer, 0, buffer.Length) Loop End Using End Using End Using The stream to be read or written while deflating or inflating. Indicates whether the ZlibStream will compress or decompress. A tuning knob to trade speed for effectiveness. Create a ZlibStream using the specified CompressionMode, and explicitly specify whether the captive stream should be left open after Deflation or Inflation. When mode is CompressionMode.Compress, the ZlibStream will use the default compression level. This constructor allows the application to request that the captive stream remain open after the deflation or inflation occurs. By default, after Close() is called on the stream, the captive stream is also closed. In some cases this is not desired, for example if the stream is a that will be re-read after compression. Specify true for the parameter to leave the stream open. See the other overloads of this constructor for example code. The stream which will be read or written. This is called the "captive" stream in other places in this documentation. Indicates whether the ZlibStream will compress or decompress. true if the application would like the stream to remain open after inflation/deflation. Create a ZlibStream using the specified CompressionMode and the specified CompressionLevel, and explicitly specify whether the stream should be left open after Deflation or Inflation. This constructor allows the application to request that the captive stream remain open after the deflation or inflation occurs. By default, after Close() is called on the stream, the captive stream is also closed. In some cases this is not desired, for example if the stream is a that will be re-read after compression. Specify true for the parameter to leave the stream open. When mode is CompressionMode.Decompress, the level parameter is ignored. This example shows how to use a ZlibStream to compress the data from a file, and store the result into another file. The filestream remains open to allow additional data to be written to it. using (var output = System.IO.File.Create(fileToCompress + ".zlib")) { using (System.IO.Stream input = System.IO.File.OpenRead(fileToCompress)) { using (Stream compressor = new ZlibStream(output, CompressionMode.Compress, CompressionLevel.BestCompression, true)) { byte[] buffer = new byte[WORKING_BUFFER_SIZE]; int n; while ((n= input.Read(buffer, 0, buffer.Length)) != 0) { compressor.Write(buffer, 0, n); } } } // can write additional data to the output stream here } Using output As FileStream = File.Create(fileToCompress & ".zlib") Using input As Stream = File.OpenRead(fileToCompress) Using compressor As Stream = New ZlibStream(output, CompressionMode.Compress, CompressionLevel.BestCompression, True) Dim buffer As Byte() = New Byte(4096) {} Dim n As Integer = -1 Do While (n <> 0) If (n > 0) Then compressor.Write(buffer, 0, n) End If n = input.Read(buffer, 0, buffer.Length) Loop End Using End Using ' can write additional data to the output stream here. End Using The stream which will be read or written. Indicates whether the ZlibStream will compress or decompress. true if the application would like the stream to remain open after inflation/deflation. A tuning knob to trade speed for effectiveness. This parameter is effective only when mode is CompressionMode.Compress. This property sets the flush behavior on the stream. Sorry, though, not sure exactly how to describe all the various settings. The size of the working buffer for the compression codec. The working buffer is used for all stream operations. The default size is 1024 bytes. The minimum size is 128 bytes. You may get better performance with a larger buffer. Then again, you might not. You would have to test it. Set this before the first call to Read() or Write() on the stream. If you try to set it afterwards, it will throw. Returns the total number of bytes input so far. Returns the total number of bytes output so far. Dispose the stream. This may or may not result in a Close() call on the captive stream. See the constructors that have a leaveOpen parameter for more information. This method may be invoked in two distinct scenarios. If disposing == true, the method has been called directly or indirectly by a user's code, for example via the public Dispose() method. In this case, both managed and unmanaged resources can be referenced and disposed. If disposing == false, the method has been called by the runtime from inside the object finalizer and this method should not reference other objects; in that case only unmanaged resources must be referenced or disposed. indicates whether the Dispose method was invoked by user code. Indicates whether the stream can be read. The return value depends on whether the captive stream supports reading. Indicates whether the stream supports Seek operations. Always returns false. Indicates whether the stream can be written. The return value depends on whether the captive stream supports writing. Flush the stream. Reading this property always throws a . The position of the stream pointer. Setting this property always throws a . Reading will return the total bytes written out, if used in writing, or the total bytes read in, if used in reading. The count may refer to compressed bytes or uncompressed bytes, depending on how you've used the stream. Read data from the stream. If you wish to use the ZlibStream to compress data while reading, you can create a ZlibStream with CompressionMode.Compress, providing an uncompressed data stream. Then call Read() on that ZlibStream, and the data read will be compressed. If you wish to use the ZlibStream to decompress data while reading, you can create a ZlibStream with CompressionMode.Decompress, providing a readable compressed data stream. Then call Read() on that ZlibStream, and the data will be decompressed as it is read. A ZlibStream can be used for Read() or Write(), but not both. The buffer into which the read data should be placed. the offset within that data array to put the first byte read. the number of bytes to read. the number of bytes read Calling this method always throws a . The offset to seek to.... IF THIS METHOD ACTUALLY DID ANYTHING. The reference specifying how to apply the offset.... IF THIS METHOD ACTUALLY DID ANYTHING. nothing. This method always throws. Calling this method always throws a . The new value for the stream length.... IF THIS METHOD ACTUALLY DID ANYTHING. Write data to the stream. If you wish to use the ZlibStream to compress data while writing, you can create a ZlibStream with CompressionMode.Compress, and a writable output stream. Then call Write() on that ZlibStream, providing uncompressed data as input. The data sent to the output stream will be the compressed form of the data written. If you wish to use the ZlibStream to decompress data while writing, you can create a ZlibStream with CompressionMode.Decompress, and a writable output stream. Then call Write() on that stream, providing previously compressed data. The data sent to the output stream will be the decompressed form of the data written. A ZlibStream can be used for Read() or Write(), but not both. The buffer holding data to write to the stream. the offset within that data array to find the first byte to write. the number of bytes to write. Compress a string into a byte array using ZLIB. Uncompress it with . A string to compress. The string will first be encoded using UTF8, then compressed. The string in compressed form Compress a byte array into a new byte array using ZLIB. Uncompress it with . A buffer to compress. The data in compressed form Uncompress a ZLIB-compressed byte array into a single string. A buffer containing ZLIB-compressed data. The uncompressed string Uncompress a ZLIB-compressed byte array into a byte array. A buffer containing ZLIB-compressed data. The data in uncompressed form Specifies whether the target is inside or outside the System.IO.Packaging.Package. The relationship references a part that is inside the package. The relationship references a resource that is external to the package. Represent an OOXML Zip package. This is the store for all Rows, Columns and Cells. It is a Dictionary implementation that allows you to change the Key (the RowID, ColumnID or CellID ) Compares an IndexItem Creates a new collection The Cells. This list must be sorted Return the item with the RangeID Return specified index from the sorted list Insert a number of rows in the collecion but dont update the cell only the index Index of first rangeItem Insert a number of rows in the collecion Index of first rangeItem Delete rows from the collecion Update range id's on cells Init the size starting from 128 items. Double the size until the list fits. Check the size and double the size if out of bound Show empty cells as Connect datapoints with line A gap As Zero Type of sparkline Line Sparkline Column Sparkline Win/Loss Sparkline Axis min/max settings Individual per sparklines Same for all sparklines A custom value The datarange Location of the sparkline Sparkline colors Indexed color RGB The tint value The range containing the dateaxis from the sparklines. Set to Null to remove the dateaxis. The range containing the data from the sparklines The range containing the sparklines Type of sparkline Sparkline color Markercolor for the lowest negative point Markercolor for the lowest negative point Default marker color Collection of sparklines Number of sparklines in the collection Returns the sparklinegroup at the specified position. The position of the Sparklinegroup. 0-base Returns the sparklinegroup at the specified position. The position of the Sparklinegroup. 0-base Same as SetValue but will set first char to lower case. Is this value allowed to be changed? Left border style Right border style Top border style Bottom border style The color of the pattern The background color Font bold Font Italic Font-Strikeout Id for number format Build in ID's 0 General 1 0 2 0.00 3 #,##0 4 #,##0.00 9 0% 10 0.00% 11 0.00E+00 12 # ?/? 13 # ??/?? 14 mm-dd-yy 15 d-mmm-yy 16 d-mmm 17 mmm-yy 18 h:mm AM/PM 19 h:mm:ss AM/PM 20 h:mm 21 h:mm:ss 22 m/d/yy h:mm 37 #,##0 ;(#,##0) 38 #,##0 ;[Red](#,##0) 39 #,##0.00;(#,##0.00) 40 #,##0.00;[Red](#,##0.00) 45 mm:ss 46 [h]:mm:ss 47 mmss.0 48 ##0.0E+0 49 @ The background fill of a cell Angle of the linear gradient Linear or Path gradient Specifies in percentage format(from the top to the bottom) the position of the top edge of the inner rectangle (color 1). For top, 0 means the top edge of the inner rectangle is on the top edge of the cell, and 1 means it is on the bottom edge of the cell. (applies to From Corner and From Center gradients). Specifies in percentage format (from the top to the bottom) the position of the bottom edge of the inner rectangle (color 1). For bottom, 0 means the bottom edge of the inner rectangle is on the top edge of the cell, and 1 means it is on the bottom edge of the cell. Specifies in percentage format (from the left to the right) the position of the left edge of the inner rectangle (color 1). For left, 0 means the left edge of the inner rectangle is on the left edge of the cell, and 1 means it is on the right edge of the cell. (applies to From Corner and From Center gradients). Specifies in percentage format (from the left to the right) the position of the right edge of the inner rectangle (color 1). For right, 0 means the right edge of the inner rectangle is on the left edge of the cell, and 1 means it is on the right edge of the cell. (applies to From Corner and From Center gradients). Gradient Color 1 Gradient Color 2 Xml access class for gradient fillsde Type of gradient fill. Angle of the linear gradient Gradient color 1 Gradient color 2 Percentage format bottom Percentage format top Percentage format left Percentage format right Xml access class for border top level Left border style properties Right border style properties Top border style properties Bottom border style properties Diagonal border style properties Diagonal up border Diagonal down border Xml access class for border items Cell Border style Border style Xml access class xfs records. This is the top level style object. Style index Numberformat properties Font properties Fill properties Border style properties Horizontal alignment Vertical alignment Wraped text Text rotation angle Locked when sheet is protected Hide formulas when sheet is protected Prefix the formula with a quote. Readingorder Shrink to fit Indentation Xml access class for named styles Named style index Style index Name of the style The style object Xml access class for color Theme color value Tint RGB value Indexed color value Xml access class for fills Cell fill pattern style Pattern color Cell background color Xml access class for fonts The name of the font Font size Font family Text color Font Scheme If the font is bold If the font is italic If the font is striked out If the font is underlined. When set to true a the text is underlined with a single line If the font is underlined Vertical aligned Xml access class for number formats Id for number format Build in ID's 0 General 1 0 2 0.00 3 #,##0 4 #,##0.00 9 0% 10 0.00% 11 0.00E+00 12 # ?/? 13 # ??/?? 14 mm-dd-yy 15 d-mmm-yy 16 d-mmm 17 mmm-yy 18 h:mm AM/PM 19 h:mm:ss AM/PM 20 h:mm 21 h:mm:ss 22 m/d/yy h:mm 37 #,##0 ;(#,##0) 38 #,##0 ;[Red](#,##0) 39 #,##0.00;(#,##0.00) 40 #,##0.00;[Red](#,##0.00) 45 mm:ss 46 [h]:mm:ss 47 mmss.0 48 ##0.0E+0 49 @ Xml helper class for cell style classes Handels paragraph text Text A collection of Paragraph objects Add a rich text string The text to add Cell Border style Left border style Right border style Top border style Bottom border style 0Diagonal border style A diagonal from the bottom left to top right of the cell A diagonal from the top left to bottom right of the cell Set the border style around the range. The border style Set the border style around the range. The border style The color of the border Cell border style The line style of the border The color of the border Color for cellstyling The theme color The tint value The RGB value The indexed color number. Set the color of the object The color Return the RGB value for the Indexed or Tint property The RGB color starting with a # Return the RGB value for the color object that uses the Indexed or Tint property The color object The RGB color starting with a # The background fill of a cell The pattern for solid fills. The color of the pattern The background color Access to properties for gradient fill. A richtext part The text Preserves whitespace. Default true Bold text Italic text Strike-out text Underlined text Vertical Alignment Font size Name of the font Text color Collection of Richtext objects Collection containing the richtext objects Items in the list Add a rich text string The text to add Insert a rich text string at the specified index. The zero-based index at which rich text should be inserted. The text to insert. Clear the collection Removes an item at the specific index Removes an item The text Toplevel class for cell styling Numberformat Font styling Fill Styling Border The horizontal alignment in the cell The vertical alignment in the cell Wrap the text Readingorder Shrink the text to fit The margin between the border and the text Text orientation in degrees. Values range from 0 to 180. If true the cell is locked for editing when the sheet is protected If true the formula is hidden when the sheet is protected. If true the cell has a quote prefix, which indicates the value of the cell is prefixed with a single quote. The index in the style collection Cell style Font The name of the font The Size of the font Font family Cell color Scheme Font-bold Font-italic Font-Strikeout Font-Underline Font-Vertical Align Set the font from a Font object The numberformat of the cell The numeric index fror the format The numberformat If the numeric format is a build-in from. Border line style Horizontal text alignment Vertical text alignment Font-Vertical Align Font-Underlinestyle for Fill pattern Type of gradient fill No gradient fill. This gradient fill is of linear gradient type. Linear gradient type means that the transition from one color to the next is along a line (e.g., horizontal, vertical,diagonal, etc.) This gradient fill is of path gradient type. Path gradient type means the that the boundary of transition from one color to the next is a rectangle, defined by top,bottom, left, and right attributes on the gradientFill element. The reading order Reading order is determined by scanning the text for the first non-whitespace character: if it is a strong right-to-left character, the reading order is right-to-left; otherwise, the reading order left-to-right. Left to Right Right to Left Linestyle Type of font strike Used by Rich-text and Paragraphs. Set the font style from a font object Read and write a compound document. Read spec here https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-CFB/[MS-CFB].pdf Verifies that the header is correct. The file 0=Red 1=Black Type of object 0x00 - Unknown or unallocated 0x01 - Storage Object 0x02 - Stream Object 0x05 - Root Storage Object Compare length first, then sort by name in upper invariant The other item Tries to parse a double from the specified which is expected to be a string value. The string value. The double value parsed from the specified . True if could be parsed to a double; otherwise, false. Tries to parse a boolean value from the specificed . The value to check for boolean-ness. The boolean value parsed from the specified . True if could be parsed Tries to parse a from the specified which is expected to be a string value. The string value. The double value parsed from the specified . True if could be parsed to a double; otherwise, false. Convert an object value to a double Return NaN if invalid double otherwise 0 OOXML requires that "," , and & be escaped, but ' and " should *not* be escaped, nor should any extended Unicode characters. This function only encodes the required characters. System.Security.SecurityElement.Escape() escapes ' and " as ' and ", so it cannot be used reliably. System.Web.HttpUtility.HtmlEncode overreaches as well and uses the numeric escape equivalent. Return true if preserve space attribute is set. Return true if preserve space attribute is set. Return true if preserve space attribute is set. Convert cell value to desired type, including nullable structs. When converting blank string to nullable struct (e.g. ' ' to int?) null is returned. When attempted conversion fails exception is passed through. The type to convert to. The converted to . If input is string, parsing is performed for output types of DateTime and TimeSpan, which if fails throws . Another special case for output types of DateTime and TimeSpan is when input is double, in which case is used for conversion. This special case does not work through other types convertible to double (e.g. integer or string with number). In all other cases 'direct' conversion is performed. is string and its format is invalid for conversion (parsing fails) is not string and direct conversion fails Compression using a run length encoding algorithm. See MS-OVBA Section 2.4 Byte array to decompress Decompression using a run length encoding algorithm. See MS-OVBA Section 2.4 Byte array to decompress Extension methods for guarding Throws an ArgumentNullException if argument is null Argument type Argument to check parameter/argument name Throws an if the string argument is null or empty Argument to check parameter/argument name Throws an ArgumentOutOfRangeException if the value of the argument is out of the supplied range Type implementing The argument to check Min value of the supplied range Max value of the supplied range parameter/argument name An argument Argument Type Utility for validation Class for handling translation between ExcelAddresses and sqref addresses. Transforms an address to a valid sqRef address. The address to transform A valid SqRef address Transforms an sqRef address into a excel address The address to transform A valid excel address Type of VBA module A Workbook or Worksheet objects A Module A Class Designer, typically a user form A VBA code module. The name of the module A description of the module The code without any module level attributes. Can contain function level attributes. A reference to the helpfile Module level attributes. Type of module If the module is readonly If the module is private To determine if the attribute uses double quotes around the value A string Not a string The name of the attribute The datatype. Determine if the attribute uses double quotes around the value. The value of the attribute without any double quotes. Base class for VBA collections Indexer Name Indexer Position Number of items in the collection If a specific name exists in the collection The name True if the name exists Removes the item Removes the item at the specified index THe index Collection class for VBA modules Adds a new VBA Module The name of the module The module object Adds a new VBA class The name of the class Private or Public not createble The class object A collection of the vba projects references Adds a new reference The reference object A collection of the module level attributes Represents the VBA project part of the package Type of system where the VBA project was created. System kind. Default Win32. Name of the project A description of the project A helpfile Secondary helpfile Context if refering the helpfile Conditional compilation constants Codepage for encoding. Default is current regional setting. Project references Code Modules (Modules, classes, designer code) The digital signature VBA protection 2.4.3.3 Decryption Byte hex string The decrypted value 2.4.3.2 Encryption Byte hex string MS-OVBA 2.3.4.1 MS-OVBA 2.3.4.1 Create a new VBA Project Remove the project from the package Vba security properties Specifies whether access to the VBA project was restricted by the user Specifies whether access to the VBA project was restricted by the VBA host application Specifies whether access to the VBA project was restricted by the VBA project editor Specifies whether the VBA project is visible. Password protect the VBA project. An empty string or null will remove the password protection The password A VBA reference Constructor. Defaults ReferenceRecordID to 0xD The reference record ID. See MS-OVBA documentation for more info. The name of the reference LibID For more info check MS-OVBA 2.1.1.8 LibidReference and 2.3.4.2.2 PROJECTREFERENCES A string representation of the object (the Name) A reference to a twiddled type library Constructor. Sets ReferenceRecordID to 0x2F LibIdExternal For more info check MS-OVBA 2.1.1.8 LibidReference and 2.3.4.2.2 PROJECTREFERENCES LibIdTwiddled For more info check MS-OVBA 2.1.1.8 LibidReference and 2.3.4.2.2 PROJECTREFERENCES A GUID that specifies the Automation type library the extended type library was generated from. A reference to an external VBA project Constructor. Sets ReferenceRecordID to 0x0E LibIdRelative For more info check MS-OVBA 2.1.1.8 LibidReference and 2.3.4.2.2 PROJECTREFERENCES Major version of the referenced VBA project Minor version of the referenced VBA project The code signature properties of the project The certificate to sign the VBA project. This certificate must have a private key. There is no validation that the certificate is valid for codesigning, so make sure it's valid to sign Excel files (Excel 2010 is more strict that prior versions). The verifier Access to workbook view properties Creates a new ExcelWorkbookView which provides access to all the view states of the worksheet. Position of the upper left corner of the workbook window. In twips. Position of the upper left corner of the workbook window. In twips. Width of the workbook window. In twips. Height of the workbook window. In twips. If true the the workbook window is minimized. Show the vertical scrollbar Show the horizontal scrollbar Show the sheet tabs Set the window position in twips Represents the different view states of the worksheet The worksheet panes after a freeze or split. Set the active cell. Must be set within the SelectedRange. Selected Cells.Used in combination with ActiveCell Creates a new ExcelWorksheetView which provides access to all the view states of the worksheet. Returns a reference to the sheetView element The active cell. Single Cell address. This cell must be inside the selected range. If not, the selected range is set to the active cell address Selected Cells in the worksheet. Used in combination with ActiveCell. If the active cell is not inside the selected range, the active cell will be set to the first cell in the selected range. If the selected range has multiple adresses, these are separated with space. If the active cell is not within the first address in this list, the attribute ActiveCellId must be set (not supported, so it must be set via the XML). Indicates if the worksheet is selected within the workbook. NOTE: Setter clears other selected tabs. Indicates if the worksheet is selected within the workbook. NOTE: Setter keeps other selected tabs. Sets whether the worksheet is selected within the workbook. Whether the tab is selected, defaults to true. Whether to allow multiple active tabs, defaults to false. Sets the view mode of the worksheet to pagelayout Sets the view mode of the worksheet to pagebreak Show gridlines in the worksheet Show the Column/Row headers (containg column letters and row numbers) Window zoom magnification for current view representing percent values. Flag indicating whether the sheet is in 'right to left' display mode. When in this mode,Column A is on the far right, Column B ;is one column left of Column A, and so on. Also,information in cells is displayed in the Right to Left format. Reference to the panes Freeze the columns/rows to left and above the cell Unlock all rows and columns to scroll freely /// Base class for pivot table field groups A date group How to group the date field Auto detect start date Auto detect end date A pivot table field numeric grouping Start value End value Interval A field Item. Used for grouping The text. Unique values only A page / report filter field The Name of the field A pivo table data field The field The index of the datafield The name of the datafield Field index. Reference to the field collection Specifies the index to the base item when the ShowDataAs calculation is in use Number format id. Number format for the data column Type of aggregate function Base collection class for pivottable fields Indexer by name Returns the date group field. The type of grouping The matching field. If none is found null is returned Returns the numeric group field. The matching field. If none is found null is returned Collection class for Row and column fields in a Pivottable Add a new row/column field The field The new field Insert a new row/column field The field The position to insert the field The new field Remove a field Remove a field at a specific position Collection class for data fields in a Pivottable Add a new datafield The field The new datafield Remove a datafield Indicates that the cache contains data that consolidates ranges. Indicates that the cache contains data from an external data source. Indicates that the cache contains a scenario summary report Indicates that the cache contains worksheet data Cache definition. This class defines the source data. Note that one cache definition can be shared between many pivot tables. Reference to the internal package part Provides access to the XML data representing the cache definition in the package. The package internal URI to the pivottable cache definition Xml Document. Referece to the PivoTable object The source data range when the pivottable has a worksheet datasource. The number of columns in the range must be intact if this property is changed. The range must be in the same workbook as the pivottable. Type of source data Defines the axis for a PivotTable None Column axis Page axis (Include Count Filter) Row axis Values axis Build-in table row functions Defines the data formats for a field in the PivotTable Indicates the field is shown as the "difference from" a value. Indicates the field is shown as the "index. Indicates that the field is shown as its normal datatype. /Indicates the field is show as the "percentage of" a value Indicates the field is shown as the "percentage difference from" a value. Indicates the field is shown as the percentage of column. Indicates the field is shown as the percentage of row Indicates the field is shown as percentage of total. Indicates the field is shown as running total in the table. Built-in subtotal functions Data grouping Sorting A pivot table field. Name of the field Compact mode A boolean that indicates whether the items in this field should be shown in Outline form The custom text that is displayed for the subtotals label A boolean that indicates whether to show all items for this field The type of sort that is applied to this field A boolean that indicates whether manual filter is in inclusive mode Enumeration of the different subtotal operations that can be applied to page, row or column fields Type of axis If the field is a row field If the field is a column field If the field is a datafield If the field is a page field. Grouping settings. Null if the field has no grouping otherwise ExcelPivotTableFieldNumericGroup or ExcelPivotTableFieldNumericGroup. Pivottable field Items. Used for grouping. Add numberic grouping to the field Start value End value Interval Add a date grouping on this field. Group by Add a date grouping on this field. Group by Fixed start date. Use DateTime.MinValue for auto Fixed end date. Use DateTime.MaxValue for auto Add a date grouping on this field. Number of days when grouping on days Fixed start date. Use DateTime.MinValue for auto Fixed end date. Use DateTime.MaxValue for auto A collection of pivottable objects Create a pivottable on the supplied range The range address including header and total row The Source data range address The name of the table. Must be unique The pivottable object The pivottable Index. Base 0. Pivottabes accesed by name The name of the pivottable The Pivotable. Null if the no match is found An Excel Pivottable Add a new pivottable The worksheet the address of the pivottable The address of the Source data Provides access to the XML data representing the pivottable in the package. The package internal URI to the pivottable Xml Document. Name of the pivottable object in Excel Reference to the pivot table cache definition object The worksheet where the pivottable is located The location of the pivot table If multiple datafields are displayed in the row area or the column area if true apply legacy table autoformat number format properties. If true apply legacy table autoformat border properties If true apply legacy table autoformat font properties If true apply legacy table autoformat pattern properties If true apply legacy table autoformat width/height properties. Show member property information Show the drill indicators If the user is prevented from drilling down on a PivotItem or aggregate value Show the drill down buttons If the tooltips should be displayed for PivotTable data cells. If the row and column titles from the PivotTable should be printed. If the row and column titles from the PivotTable should be printed. If the grand totals should be displayed for the PivotTable columns If the grand totals should be displayed for the PivotTable rows If the drill indicators expand collapse buttons should be printed. Indicates whether to show error messages in cells. The string to be displayed in cells that contain errors. Specifies the name of the value area field header in the PivotTable. This caption is shown when the PivotTable when two or more fields are in the values area. Show field headers The number of page fields to display before starting another row or column A boolean that indicates whether legacy auto formatting has been applied to the PivotTable view A boolean that indicates whether the in-grid drop zones should be displayed at runtime, and whether classic layout is applied Specifies the indentation increment for compact axis and can be used to set the Report Layout to Compact Form A boolean that indicates whether data fields in the PivotTable should be displayed in outline form a boolean that indicates whether new fields should have their outline flag set to true A boolean that indicates whether the fields of a PivotTable can have multiple filters set on them A boolean that indicates whether new fields should have their compact flag set to true A boolean that indicates whether the field next to the data field in the PivotTable should be displayed in the same column of the spreadsheet Specifies the string to be displayed for grand totals. Specifies the string to be displayed in row header in compact mode. Specifies the string to be displayed in cells with no value Specifies the first row of the PivotTable header, relative to the top left cell in the ref value Specifies the first column of the PivotTable data, relative to the top left cell in the ref value Specifies the first column of the PivotTable data, relative to the top left cell in the ref value The fields in the table Row label fields Column label fields Value fields Report filter fields Pivot style name. Used for custom styles The table style. If this property is cusom the style from the StyleName propery is used. A collection of table columns A reference to the table object Number of items in the collection The column Index. Base 0. Indexer The name of the table The table column. Null if the table name is not found in the collection Table style Enum An Excel Table Provides access to the XML data representing the table in the package. The package internal URI to the Table Xml Document. The name of the table object in Excel The worksheet of the table The address of the table Collection of the columns in the table The table style. If this property is cusom, the style from the StyleName propery is used. If the header row is visible or not If the header row has an autofilter If the total row is visible or not The style name for custum styles Display special formatting for the first row Display special formatting for the last row Display banded rows Display banded columns Named style used for the total row Named style used for the data cells Named style used for the header row A collection of table objects Create a table on the supplied range The range address including header and total row The name of the table. Must be unique The table object Number of items in the collection Get the table object from a range. The range The table. Null if no range matches The table Index. Base 0. Indexer The name of the table The table. Null if the table name is not found in the collection Build-in table row functions A table column The column id The position of the column The name of the column A string text in the total row Build-in total row functions. To set a custom Total row formula use the TotalsRowFormula property Sets a custom Totals row Formula. Be carefull with this property since it is not validated. tbl.Columns[9].TotalsRowFormula = string.Format("SUM([{0}])",tbl.Columns[9].Name); The named style for datacells in the column Sets a calculated column Formula. Be carefull with this property since it is not validated. tbl.Columns[9].CalculatedColumnFormula = string.Format("SUM(MyDataTable[[#This Row],[{0}]])",tbl.Columns[9].Name); Provides access to the properties bag of the package Provides access to all the office document properties. Provides access to the XML document that holds all the code document properties. Gets/sets the title property of the document (core property) Gets/sets the subject property of the document (core property) Gets/sets the author property of the document (core property) Gets/sets the comments property of the document (core property) Gets/sets the keywords property of the document (core property) Gets/sets the lastModifiedBy property of the document (core property) Gets/sets the lastPrinted property of the document (core property) Gets/sets the created property of the document (core property) Gets/sets the category property of the document (core property) Gets/sets the status property of the document (core property) Provides access to the XML document that holds the extended properties of the document (app.xml) Gets/Set the Application property of the document (extended property) Gets/sets the HyperlinkBase property of the document (extended property) Gets/Set the AppVersion property of the document (extended property) Gets/sets the Company property of the document (extended property) Gets/sets the Manager property of the document (extended property) Gets/sets the modified property of the document (core property) Get the value of an extended property The name of the property The value Set the value for an extended property The name of the property The value Provides access to the XML document which holds the document's custom properties Gets the value of a custom property The name of the property The current value of the property Allows you to set the value of a current custom property or create your own custom property. The name of the property The value of the property Saves the document properties back to the package. How the application should calculate formulas in the workbook Indicates that calculations in the workbook are performed automatically when cell values change. The application recalculates those cells that are dependent on other cells that contain changed values. This mode of calculation helps to avoid unnecessary calculations. Indicates tables be excluded during automatic calculation Indicates that calculations in the workbook be triggered manually by the user. Represents the Excel workbook and provides access to all the document properties and worksheets within the workbook. Creates a new instance of the ExcelWorkbook class. The parent package NamespaceManager Read shared strings to list Provides access to all the worksheets in the workbook. Note: Worksheets index either starts by 0 or 1 depending on the Excelpackage.Compatibility.IsWorksheets1Based property. Default is 1 for .Net 3.5 and .Net 4 and 0 for .Net Core. Provides access to named ranges Max font width for the workbook This method uses GDI. If you use Asure or another environment that does not support GDI, you have to set this value manually if you don't use the standard Calibri font Access properties to protect or unprotect a workbook Access to workbook view properties A reference to the VBA project. Null if no project exists. Use Workbook.CreateVBAProject to create a new VBA-Project Create an empty VBA project. URI to the workbook inside the package URI to the styles inside the package URI to the shared strings inside the package Returns a reference to the workbook's part within the package Provides access to the XML data representing the workbook in the package. The date systems used by Microsoft Excel can be based on one of two different dates. By default, a serial number of 1 in Microsoft Excel represents January 1, 1900. The default for the serial number 1 can be changed to represent January 2, 1904. This option was included in Microsoft Excel for Windows to make it compatible with Excel for the Macintosh, which defaults to January 2, 1904. Create or read the XML for the workbook. Provides access to the XML data representing the styles in the package. Package styles collection. Used internally to access style data. The office document properties Calculation mode for the workbook. Should Excel do a full calculation after the workbook has been loaded? This property is always true for both new workbooks and loaded templates(on load). If this is not the wanted behavior set this property to false. Saves the workbook and all its components to the package. For internal use only! Is their any names in the workbook or in the sheets. ? Worksheet hidden enumeration The worksheet is visible The worksheet is hidden but can be shown by the user via the user interface The worksheet is hidden and cannot be shown by the user via the user interface For Cell value structure (for memory optimization of huge sheet) Represents an Excel Chartsheet and provides access to its properties and methods Represents an Excel worksheet and provides access to its properties and methods Collection containing merged cell addresses A worksheet Namespacemanager Package Relationship ID URI Name of the sheet Sheet id Position hide The Uri to the worksheet within the package The Zip.ZipPackagePart for the worksheet within the package The ID for the worksheet's relationship with the workbook in the package The unique identifier for the worksheet. The position of the worksheet. The index in the worksheets collection Address for autofilter Returns a ExcelWorksheetView object that allows you to set the view state properties of the worksheet The worksheet's display name as it appears on the tab Provides access to named ranges Indicates if the worksheet is hidden in the workbook Get/set the default height of all rows in the worksheet 'True' if defaultRowHeight value has been manually set, or is different from the default value. Is automaticlly set to 'True' when assigning the DefaultRowHeight property Get/set the default width of all columns in the worksheet * Summary rows below details Summary rows to right of details Automatic styles Color of the sheet tab The XML document holding the worksheet data. All column, row, cell, pagebreak, merged cell and hyperlink-data are loaded into memory and removed from the document when loading the document. Vml drawings. underlaying object for comments Collection of comments Get the lenth of the attributes Conditional formatting attributes can be extremly long som get length of the attributes to finetune position. Extracts the workbook XML without the sheetData-element (containing all cell data). Xml-Cell data can be extreemly large (GB), so we find the sheetdata element in the streem (position start) and then tries to find the </sheetData> element from the end-parameter. This approach is to avoid out of memory exceptions reading large packages the worksheet stream Position from previous reading where we found the sheetData element End position, where </sheetData> or <sheetData/> is found Encoding The worksheet xml, with an empty sheetdata. (Sheetdata is in memory in the worksheet) Read until the node is found. If not found the xmlreader is reseted. The reader Text to search for Alternative text to search for Load Hyperlinks The reader Load cells The reader Load merged cells Update merged cells The writer Reads a row from the XML reader The reader The row number A reference to the header and footer class which allows you to set the header and footer for all odd, even and first pages of the worksheet To format the text you can use the following format PrefixDescription &UUnderlined &EDouble Underline &K:xxxxxxColor. ex &K:FF0000 for red &"Font,Regular Bold Italic"Changes the font. Regular or Bold or Italic or Bold Italic can be used. ex &"Arial,Bold Italic" &nnChange font size. nn is an integer. ex &24 &GPlaceholder for images. Images can not be added by the library, but its possible to use in a template. Printer settings Provides access to a range of cells Provides access to the selected range of cells Addresses to merged ranges Provides access to an individual row within the worksheet so you can set its properties. The row number in the worksheet Provides access to an individual column within the worksheet so you can set its properties. The column number in the worksheet Returns the name of the worksheet The name of the worksheet Make the current worksheet active. Selects a range in the worksheet. The active cell is the topmost cell. Make the current worksheet active. An address range Selects a range in the worksheet. The actice cell is the topmost cell. A range of cells Make the sheet active Selects a range in the worksheet. The active cell is the topmost cell of the first address. Make the current worksheet active. An address range Selects a range in the worksheet. The active cell is the topmost cell of the first address. A range of cells Make the sheet active Inserts a new row into the spreadsheet. Existing rows below the position are shifted down. All formula are updated to take account of the new row. The position of the new row Number of rows to insert Inserts a new row into the spreadsheet. Existing rows below the position are shifted down. All formula are updated to take account of the new row. The position of the new row Number of rows to insert. Copy Styles from this row. Applied to all inserted rows Inserts a new column into the spreadsheet. Existing columns below the position are shifted down. All formula are updated to take account of the new column. The position of the new column Number of columns to insert Inserts a new column into the spreadsheet. Existing column to the left are shifted. All formula are updated to take account of the new column. The position of the new column Number of columns to insert. Copy Styles from this column. Applied to all inserted columns Adds a value to the row of merged cells to fix for inserts or deletes Adds a value to the row of merged cells to fix for inserts or deletes Delete the specified row from the worksheet. A row to be deleted Delete the specified row from the worksheet. The start row Number of rows to delete Delete the specified column from the worksheet. The column to be deleted Delete the specified column from the worksheet. The start column Number of columns to delete Deletes the specified row from the worksheet. The number of the start row to be deleted Number of rows to delete Not used. Rows are always shifted Get the cell value from thw worksheet The row number The row number The value Get a strongly typed cell value from the worksheet The type The row number The row number The value. If the value can't be converted to the specified type, the default value will be returned Set the value of a cell The row number The column number The value Set the value of a cell The Excel address The value Get MergeCell Index No Delete the printersettings relationship and part. Save all table data Inserts the cols collection into the XML document Insert row and cells into the XML document Check all Shared formulas that the first cell has not been deleted. If so create a standard formula of all cells in the formula . Update xml with hyperlinks The stream Create the hyperlinks node in the XML Dimension address for the worksheet. Top left cell to Bottom right. If the worksheet has no cells, null is returned Access to sheet protection properties Collection of drawing-objects like shapes, images and charts Collection of Sparkline-objects. Sparklines are small in-cell charts. Tables defined in the worksheet. Pivottables defined in the worksheet. ConditionalFormatting defined in the worksheet. Use the Add methods to create ConditionalFormatting and add them to the worksheet. Then set the properties on the instance returned. DataValidation defined in the worksheet. Use the Add methods to create DataValidations and add them to the worksheet. Then set the properties on the instance returned. An image displayed as the background of the worksheet. Returns the style ID given a style name. The style ID will be created if not found, but only if the style name exists! The workbook object Get the next ID from a shared formula or an Array formula Sharedforumlas will have an id from 0-x. Array formula ids start from 0x4000001-. If the formula is an array formula Get the ExcelColumn for column (span ColumnMin and ColumnMax) Get accessor of sheet value row column cell value Get accessor of sheet styleId row column cell styleId Set accessor of sheet value row column value Set accessor of sheet styleId row column styleId Bulk(Range) set accessor of sheet value, for value array start row start column end row end column set values Existance check of sheet value row column is exists Existance check of sheet styleId row column is exists Existance check of sheet value row column is exists Existance check of sheet styleId row column is exists The collection of worksheets for the workbook Returns the number of worksheets in the workbook Foreach support An enumerator Adds a new blank worksheet. The name of the workbook Adds a copy of a worksheet The name of the workbook The worksheet to be copied Adds a chartsheet to the workbook. Validate the sheetname The Name True if valid Creates the XML document representing a new empty worksheet Deletes a worksheet from the collection The position of the worksheet in the workbook Deletes a worksheet from the collection The name of the worksheet in the workbook Delete a worksheet from the collection The worksheet to delete Returns the worksheet at the specified position. The position of the worksheet. 1-base Returns the worksheet matching the specified name The name of the worksheet Copies the named worksheet and creates a new worksheet in the same workbook The name of the existing worksheet The name of the new worksheet to create The new copy added to the end of the worksheets collection Moves the source worksheet to the position before the target worksheet The name of the source worksheet The name of the target worksheet Moves the source worksheet to the position before the target worksheet The id of the source worksheet The id of the target worksheet Moves the source worksheet to the position after the target worksheet The name of the source worksheet The name of the target worksheet Moves the source worksheet to the position after the target worksheet The id of the source worksheet The id of the target worksheet Help class containing XML functions. Can be Inherited Schema order list Create the node path. Nodesa are inserted according to the Schema node oreder The path to be created Insert as first child Always add a new item at the last level. Options to insert a node in the XmlDocument Insert as first node of "topNode" Insert as the last child of "topNode" Insert after the "referenceNode" Insert before the "referenceNode" Use the Schema List to insert in the right order. If the Schema list is null or empty, consider "Last" as the selected option Create a complex node. Insert the node according to SchemaOrder using the TopNode as the parent Create a complex node. Insert the node according to the using the as the parent Creates complex XML nodes 1. "d:conditionalFormatting" 1.1. Creates/find the first "conditionalFormatting" node 2. "d:conditionalFormatting/@sqref" 2.1. Creates/find the first "conditionalFormatting" node 2.2. Creates (if not exists) the @sqref attribute 3. "d:conditionalFormatting/@id='7'/@sqref='A9:B99'" 3.1. Creates/find the first "conditionalFormatting" node 3.2. Creates/update its @id attribute to "7" 3.3. Creates/update its @sqref attribute to "A9:B99" 4. "d:conditionalFormatting[@id='7']/@sqref='X1:X5'" 4.1. Creates/find the first "conditionalFormatting" node with @id=7 4.2. Creates/update its @sqref attribute to "X1:X5" 5. "d:conditionalFormatting[@id='7']/@id='8'/@sqref='X1:X5'/d:cfRule/@id='AB'" 5.1. Creates/find the first "conditionalFormatting" node with @id=7 5.2. Set its @id attribute to "8" 5.2. Creates/update its @sqref attribute and set it to "X1:X5" 5.3. Creates/find the first "cfRule" node (inside the node) 5.4. Creates/update its @id attribute to "AB" 6. "d:cfRule/@id=''" 6.1. Creates/find the first "cfRule" node 6.1. Remove the @id attribute The last node creates/found return Prepend node name of the node to check Topnode to check children Insert the new node before any of the nodes in the comma separeted list Parent node comma separated list containing nodes to insert after. Left to right order The new node to be inserterd A range address Examples of addresses are "A1" "B1:C2" "A:A" "1:1" "A1:E2,G3:G5" Creates an Address object start row start column End row End column Creates an Address object Worksheet Name start row start column End row End column Creates an Address object start row start column End row End column start row fixed start column fixed End row fixed End column fixed Creates an Address object Examples of addresses are "A1" "B1:C2" "A:A" "1:1" "A1:E2,G3:G5" The Excel Address Creates an Address object Examples of addresses are "A1" "B1:C2" "A:A" "1:1" "A1:E2,G3:G5" The Excel Address Reference to the package to find information about tables and names The address Address is an defined name the name Should always be true Gets the row and column of the top left cell. The start row column. Gets the row and column of the bottom right cell. The end row column. The address for the range If the address is a defined name Returns the address text returns the first address if the address is a multi address. A1:A2,B1:B2 returns A1:A2 Validate the address Range address with the address property readonly The address for the range Examples of addresses are "A1" "B1:C2" "A:A" "1:1" "A1:E2,G3:G5" The address for the range Examples of addresses are "A1" "B1:C2" "A:A" "1:1" "A1:E2,G3:G5" A single cell address Initializes a new instance of the ExcelCellAddress class. The row. The column. Initializes a new instance of the ExcelCellAddress class. The address Row Column Celladdress If the address is an invalid reference (#REF!) Returns the letter corresponding to the supplied 1-based column index. Index of the column (1-based) The corresponding letter, like A for 1. An Excel Cell Comment Author The comment text Sets the font of the first richtext item. Richtext collection Reference Collection of Excelcomment objects Access to the comment xml document A reference to the worksheet object Number of comments in the collection Indexer for the comments collection The index The comment Indexer for the comments collection The cell The comment Adds a comment to the top left cell of the range The cell The comment text Author The comment Removes the comment The comment to remove Shifts all comments based on their address and the location of inserted rows and columns. The start row. The start column. The number of rows to insert. The number of columns to insert. Shifts all comments based on their address and the location of inserted rows and columns. The start row. The start column. The number of rows to insert. The number of columns to insert. Removes the comment at the specified position The index Sheet protection If the worksheet is protected. Allow users to select locked cells Allow users to select unlocked cells Allow users to edit objects Allow users to edit senarios Allow users to format cells Allow users to Format columns Allow users to Format rows Allow users to insert columns Allow users to Format rows Allow users to insert hyperlinks Allow users to delete columns Allow users to delete rows Allow users to sort a range Allow users to use autofilters Allow users to use pivottables Sets a password for the sheet. Base class containing cell address manipulating methods. Get the sheet, row and column from the CellID Get the cellID for the cell. Translates a R1C1 to an absolut address/Formula Address Current row Current column The RC address Translates a absolut address to R1C1 Format R1C1 Address Current row Current column The absolut address/Formula Translates betweein R1C1 or absolut addresses The addresss/function The translating function Translate to R1C1 the value to be translated Translates to absolute address Adds or subtracts a row or column to an address Returns with brackets if the value is negative The value Get the offset value for RC format Returns the character representation of the numbered column The number of the column The letter representing the column Get the row/columns for a Cell-address The address Returns the to column Returns the from column Returns the to row Returns the from row Is the from row fixed? Is the from column fixed? Is the to row fixed? Is the to column fixed? Get the row/column for n Cell-address The address Returns Tthe row Returns the column true if valid Get the row/column for a Cell-address the address returns the row returns the column throw exception if invalid, otherwise returns false Returns the AlphaNumeric representation that Excel expects for a Cell Address The number of the row The number of the column in the worksheet The cell address in the format A1 Returns the AlphaNumeric representation that Excel expects for a Cell Address The number of the row The number of the column in the worksheet Absolute row Absolute column The cell address in the format A1 Returns the AlphaNumeric representation that Excel expects for a Cell Address The number of the row The number of the column in the worksheet Get an absolute address ($A$1) The cell address in the format A1 Returns the AlphaNumeric representation that Excel expects for a Cell Address From row number From column number To row number From column number The cell address in the format A1 Returns the AlphaNumeric representation that Excel expects for a Cell Address From row number From column number To row number From column number if true address is absolute (like $A$1) The cell address in the format A1 Returns the AlphaNumeric representation that Excel expects for a Cell Address From row number From column number To row number From column number The cell address in the format A1 Get the full address including the worksheet name The name of the worksheet The address The full address Checks that a cell address (e.g. A5) is valid. The alphanumeric cell address True if the cell address is valid Updates the Excel formula so that all the cellAddresses are incremented by the row and column increments if they fall after the afterRow and afterColumn. Supports inserting rows and columns into existing templates. The Excel formula The amount to increment the cell reference by The amount to increment the cell reference by Only change rows after this row Only change columns after this column The sheet that contains the formula currently being processed. The sheet where cells are being inserted or deleted. Fixed address The updated version of the . Updates all the references to a renamed sheet in a formula. The formula to updated. The old sheet name. The new sheet name. The formula with all cross-sheet references updated. HyperlinkClass A new hyperlink with the specified URI The URI A new hyperlink with the specified URI. This syntax is obsolete The URI A new hyperlink with the specified URI and kind The URI Kind (absolute/relative or indeterminate) Sheet internal reference Address Displayed text The Excel address for internal links. Displayed text Tooltip If the hyperlink spans multiple columns If the hyperlink spans multiple rows Used to handle non absolute URI's. Is used if IsAblsoluteUri is true. The base URI will have a dummy value of xl://nonAbsolute. A named range. A named range The name The sheet containing the name. null if its a global name Sheet where the address points The address The index in the collection Name of the range Is the named range local for the sheet Is the name hidden A comment for the Name Collection for named ranges Add a new named range The name The range Add a defined name referencing value Add a defined name referencing a formula -- the method name contains a typo. This method is obsolete and will be removed in the future. Use Add a defined name referencing a formula Remove a defined name from the collection The name Checks collection for the presence of a key key to search for true if the key is in the collection The current number of items in the collection Name indexer The name (key) for a Named range a reference to the range Throws a KeyNotFoundException if the key is not in the collection. Implement interface method IEnumerator<ExcelNamedRange> GetEnumerator() Implement interface method IEnumeratable GetEnumerator() Printer orientation Portrait orientation Landscape orientation Papersize Letter paper (8.5 in. by 11 in.) Letter small paper (8.5 in. by 11 in.) // Tabloid paper (11 in. by 17 in.) Ledger paper (17 in. by 11 in.) Legal paper (8.5 in. by 14 in.) Statement paper (5.5 in. by 8.5 in.) Executive paper (7.25 in. by 10.5 in.) A3 paper (297 mm by 420 mm) A4 paper (210 mm by 297 mm) A4 small paper (210 mm by 297 mm) A5 paper (148 mm by 210 mm) B4 paper (250 mm by 353 mm) B5 paper (176 mm by 250 mm) Folio paper (8.5 in. by 13 in.) Quarto paper (215 mm by 275 mm) Standard paper (10 in. by 14 in.) Standard paper (11 in. by 17 in.) Note paper (8.5 in. by 11 in.) #9 envelope (3.875 in. by 8.875 in.) #10 envelope (4.125 in. by 9.5 in.) #11 envelope (4.5 in. by 10.375 in.) #12 envelope (4.75 in. by 11 in.) #14 envelope (5 in. by 11.5 in.) C paper (17 in. by 22 in.) D paper (22 in. by 34 in.) E paper (34 in. by 44 in.) DL envelope (110 mm by 220 mm) C5 envelope (162 mm by 229 mm) C3 envelope (324 mm by 458 mm) C4 envelope (229 mm by 324 mm) C6 envelope (114 mm by 162 mm) C65 envelope (114 mm by 229 mm) B4 envelope (250 mm by 353 mm) B5 envelope (176 mm by 250 mm) B6 envelope (176 mm by 125 mm) Italy envelope (110 mm by 230 mm) Monarch envelope (3.875 in. by 7.5 in.). 6 3/4 envelope (3.625 in. by 6.5 in.) US standard fanfold (14.875 in. by 11 in.) German standard fanfold (8.5 in. by 12 in.) German legal fanfold (8.5 in. by 13 in.) ISO B4 (250 mm by 353 mm) Japanese double postcard (200 mm by 148 mm) Standard paper (9 in. by 11 in.) Standard paper (10 in. by 11 in.) Standard paper (15 in. by 11 in.) Invite envelope (220 mm by 220 mm) Letter extra paper (9.275 in. by 12 in.) Legal extra paper (9.275 in. by 15 in.) Tabloid extra paper (11.69 in. by 18 in.) A4 extra paper (236 mm by 322 mm) Letter transverse paper (8.275 in. by 11 in.) A4 transverse paper (210 mm by 297 mm) Letter extra transverse paper (9.275 in. by 12 in.) SuperA/SuperA/A4 paper (227 mm by 356 mm) SuperB/SuperB/A3 paper (305 mm by 487 mm) Letter plus paper (8.5 in. by 12.69 in.) A4 plus paper (210 mm by 330 mm) A5 transverse paper (148 mm by 210 mm) JIS B5 transverse paper (182 mm by 257 mm) A3 extra paper (322 mm by 445 mm) A5 extra paper (174 mm by 235 mm) ISO B5 extra paper (201 mm by 276 mm) A2 paper (420 mm by 594 mm) A3 transverse paper (297 mm by 420 mm) A3 extra transverse paper (322 mm by 445 mm*/ Specifies printed page order Order pages vertically first, then move horizontally. Order pages horizontally first, then move vertically Printer settings Left margin in inches Right margin in inches Top margin in inches Bottom margin in inches Header margin in inches Footer margin in inches Orientation Portrait or Landscape Fit to Width in pages. Set FitToPage to true when using this one. 0 is automatic Fit to height in pages. Set FitToPage to true when using this one. 0 is automatic Print scale Fit To Page. Print headings (column letter and row numbers) Print titles Rows to be repeated after each pagebreak. The address must be a full row address (ex. 1:1) Print titles Columns to be repeated after each pagebreak. The address must be a full column address (ex. A:A) The printarea. Null if no print area is set. Print gridlines Horizontal centered when printing w Vertical centered when printing Specifies printed page order Print black and white Print a draft Paper size All or none of the margin attributes must exist. Create all att ones. A range of cells Reference to the worksheet On change address handler We dont know the address yet. Set the delegate first time a property is set. Set a single cell Set a range Set a multirange (A1:A2,C1:C2) Set the property for an address Handles shared formulas The range The formula The address of the formula If the forumla is an array formula. The styleobject for the range. The named style The style ID. It is not recomended to use this one. Use Named styles as an alternative. If you do, make sure that you use the Style.UpdateXml() method to update any new styles added to the workbook. Set the range to a specific value Returns the formatted value. Set the column width from the content of the range. The minimum width is the value of the ExcelWorksheet.defaultColumnWidth property. Note: Cells containing formulas are ignored since EPPlus don't have a calculation engine. Wrapped and merged cells are also ignored. Set the column width from the content of the range. Note: Cells containing formulas are ignored if no calculation is made. Wrapped and merged cells are also ignored. This method will not work if you run in an environment that does not support GDI Minimum column width Set the column width from the content of the range. Note: Cells containing formulas are ignored if no calculation is made. Wrapped and merged cells are also ignored. Hidden columns are left hidden. Minimum column width Maximum column width Gets or sets a formula for a range. Gets or Set a formula in R1C1 format. Set the hyperlink property for a range of cells If the cells in the range are merged. Set an autofilter for the range If the value is in richtext format. Is the range a part of an Arrayformula Cell value is richtext formatted. Richtext-property only apply to the left-top cell of the range. returns the comment object of the first cell in the range WorkSheet object Address including sheetname Address including sheetname Address including sheetname Set the value without altering the richtext property the value Conditional Formatting for this range. Data validation for this range. Load the data from the datareader starting from the top left cell of the range The datareader to loadfrom Print the column caption property (if set) or the columnname property if not, on first row The name of the table The table style to apply to the data The filled range Load the data from the datareader starting from the top left cell of the range The datareader to load from Print the caption property (if set) or the columnname property if not, on first row The filled range Load the data from the datatable starting from the top left cell of the range The datatable to load Print the column caption property (if set) or the columnname property if not, on first row The table style to apply to the data The filled range Load the data from the datatable starting from the top left cell of the range The datatable to load Print the caption property (if set) or the columnname property if not, on first row The filled range Loads data from the collection of arrays of objects into the range, starting from the top-left cell. The data. Load a collection into a the worksheet starting from the top left row of the range. The datatype in the collection The collection to load The filled range Load a collection of T into the worksheet starting from the top left row of the range. Default option will load all public instance properties of T The datatype in the collection The collection to load Print the property names on the first row. If the property is decorated with a or a that attribute will be used instead of the reflected member name. The filled range Load a collection of T into the worksheet starting from the top left row of the range. Default option will load all public instance properties of T The datatype in the collection The collection to load Print the property names on the first row. If the property is decorated with a or a that attribute will be used instead of the reflected member name. Will create a table with this style. If set to TableStyles.None no table will be created The filled range Load a collection into the worksheet starting from the top left row of the range. The datatype in the collection The collection to load Print the property names on the first row. Any underscore in the property name will be converted to a space. If the property is decorated with a or a that attribute will be used instead of the reflected member name. Will create a table with this style. If set to TableStyles.None no table will be created Property flags to use The properties to output. Must be of type T The filled range Loads a CSV text into a range starting from the top left cell. Default settings is Comma separation The Text The range containing the data Loads a CSV text into a range starting from the top left cell. The Text Information how to load the text The range containing the data Loads a CSV text into a range starting from the top left cell. The Text Information how to load the text Create a table with this style Use the first row as header Loads a CSV file into a range starting from the top left cell. The Textfile Loads a CSV file into a range starting from the top left cell. The Textfile Information how to load the text Loads a CSV file into a range starting from the top left cell. The Textfile Information how to load the text Create a table with this style Use the first row as header Convert cell value to desired type, including nullable structs. When converting blank string to nullable struct (e.g. ' ' to int?) null is returned. When attempted conversion fails exception is passed through. The type to convert to. The converted to . If is string, parsing is performed for output types of DateTime and TimeSpan, which if fails throws . Another special case for output types of DateTime and TimeSpan is when input is double, in which case is used for conversion. This special case does not work through other types convertible to double (e.g. integer or string with number). In all other cases 'direct' conversion is performed. is string and its format is invalid for conversion (parsing fails) is not string and direct conversion fails Get a range with an offset from the top left cell. The new range has the same dimensions as the current range Row Offset Column Offset Get a range with an offset from the top left cell. Row Offset Column Offset Number of rows. Minimum 1 Number of colums. Minimum 1 Adds a new comment for the range. If this range contains more than one cell, the top left comment is returned by the method. A reference comment of the top left cell Copies the range of cells to an other range The start cell where the range will be copied. Copies the range of cells to an other range The start cell where the range will be copied. Cell parts that will not be copied. If Formulas are specified, the formulas will NOT be copied. Clear all cells Creates an array-formula. The formula The current range when enumerating The current range when enumerating Sort the range by value of the first column, Ascending. Sort the range by value of the supplied column, Ascending. The column to sort by within the range. Zerobased Descending if true, otherwise Ascending. Default Ascending. Zerobased Sort the range by value The column(s) to sort by within the range. Zerobased Descending if true, otherwise Ascending. Default Ascending. Zerobased The CultureInfo used to compare values. A null value means CurrentCulture String compare option Id from a cell, column or row. This is the id for a cell, row or column. The id is a composit of the SheetID, the row number and the column number. Bit 1-14 SheetID, Bit 15-28 Column number (0 if entire column), Bit 29- Row number (0 if entire row). Line end style. No end Triangle arrow head Stealth arrow head Diamond Oval Line arrow head Lend end size. Smal Medium Large Shape style Text alignment Fillstyle. Provides a stream metaphor for reading zip files. This class provides an alternative programming model for reading zip files to the one enabled by the class. Use this when reading zip files, as an alternative to the class, when you would like to use a Stream class to read the file. Some application designs require a readable stream for input. This stream can be used to read a zip file, and extract entries. Both the ZipInputStream class and the ZipFile class can be used to read and extract zip files. Both of them support many of the common zip features, including Unicode, different compression levels, and ZIP64. The programming models differ. For example, when extracting entries via calls to the GetNextEntry() and Read() methods on the ZipInputStream class, the caller is responsible for creating the file, writing the bytes into the file, setting the attributes on the file, and setting the created, last modified, and last accessed timestamps on the file. All of these things are done automatically by a call to ZipEntry.Extract(). For this reason, the ZipInputStream is generally recommended for when your application wants to extract the data, without storing that data into a file. Aside from the obvious differences in programming model, there are some differences in capability between the ZipFile class and the ZipInputStream class. ZipFile can be used to create or update zip files, or read and extract zip files. ZipInputStream can be used only to read and extract zip files. If you want to use a stream to create zip files, check out the . ZipInputStream cannot read segmented or spanned zip files. ZipInputStream will not read Zip file comments. When reading larger files, ZipInputStream will always underperform ZipFile. This is because the ZipInputStream does a full scan on the zip file, while the ZipFile class reads the central directory of the zip file. Create a ZipInputStream, wrapping it around an existing stream. While the class is generally easier to use, this class provides an alternative to those applications that want to read from a zipfile directly, using a . Both the ZipInputStream class and the ZipFile class can be used to read and extract zip files. Both of them support many of the common zip features, including Unicode, different compression levels, and ZIP64. The programming models differ. For example, when extracting entries via calls to the GetNextEntry() and Read() methods on the ZipInputStream class, the caller is responsible for creating the file, writing the bytes into the file, setting the attributes on the file, and setting the created, last modified, and last accessed timestamps on the file. All of these things are done automatically by a call to ZipEntry.Extract(). For this reason, the ZipInputStream is generally recommended for when your application wants to extract the data, without storing that data into a file. Aside from the obvious differences in programming model, there are some differences in capability between the ZipFile class and the ZipInputStream class. ZipFile can be used to create or update zip files, or read and extract zip files. ZipInputStream can be used only to read and extract zip files. If you want to use a stream to create zip files, check out the . ZipInputStream cannot read segmented or spanned zip files. ZipInputStream will not read Zip file comments. When reading larger files, ZipInputStream will always underperform ZipFile. This is because the ZipInputStream does a full scan on the zip file, while the ZipFile class reads the central directory of the zip file. The stream to read. It must be readable. This stream will be closed at the time the ZipInputStream is closed. This example shows how to read a zip file, and extract entries, using the ZipInputStream class. private void Unzip() { byte[] buffer= new byte[2048]; int n; using (var raw = File.Open(inputFileName, FileMode.Open, FileAccess.Read)) { using (var input= new ZipInputStream(raw)) { ZipEntry e; while (( e = input.GetNextEntry()) != null) { if (e.IsDirectory) continue; string outputPath = Path.Combine(extractDir, e.FileName); using (var output = File.Open(outputPath, FileMode.Create, FileAccess.ReadWrite)) { while ((n= input.Read(buffer, 0, buffer.Length)) > 0) { output.Write(buffer,0,n); } } } } } } Private Sub UnZip() Dim inputFileName As String = "MyArchive.zip" Dim extractDir As String = "extract" Dim buffer As Byte() = New Byte(2048) {} Using raw As FileStream = File.Open(inputFileName, FileMode.Open, FileAccess.Read) Using input As ZipInputStream = New ZipInputStream(raw) Dim e As ZipEntry Do While (Not e = input.GetNextEntry Is Nothing) If Not e.IsDirectory Then Using output As FileStream = File.Open(Path.Combine(extractDir, e.FileName), _ FileMode.Create, FileAccess.ReadWrite) Dim n As Integer Do While (n = input.Read(buffer, 0, buffer.Length) > 0) output.Write(buffer, 0, n) Loop End Using End If Loop End Using End Using End Sub Create a ZipInputStream, given the name of an existing zip file. This constructor opens a FileStream for the given zipfile, and wraps a ZipInputStream around that. See the documentation for the constructor for full details. While the class is generally easier to use, this class provides an alternative to those applications that want to read from a zipfile directly, using a . The name of the filesystem file to read. This example shows how to read a zip file, and extract entries, using the ZipInputStream class. private void Unzip() { byte[] buffer= new byte[2048]; int n; using (var input= new ZipInputStream(inputFileName)) { ZipEntry e; while (( e = input.GetNextEntry()) != null) { if (e.IsDirectory) continue; string outputPath = Path.Combine(extractDir, e.FileName); using (var output = File.Open(outputPath, FileMode.Create, FileAccess.ReadWrite)) { while ((n= input.Read(buffer, 0, buffer.Length)) > 0) { output.Write(buffer,0,n); } } } } } Private Sub UnZip() Dim inputFileName As String = "MyArchive.zip" Dim extractDir As String = "extract" Dim buffer As Byte() = New Byte(2048) {} Using input As ZipInputStream = New ZipInputStream(inputFileName) Dim e As ZipEntry Do While (Not e = input.GetNextEntry Is Nothing) If Not e.IsDirectory Then Using output As FileStream = File.Open(Path.Combine(extractDir, e.FileName), _ FileMode.Create, FileAccess.ReadWrite) Dim n As Integer Do While (n = input.Read(buffer, 0, buffer.Length) > 0) output.Write(buffer, 0, n) Loop End Using End If Loop End Using End Sub Create a ZipInputStream, explicitly specifying whether to keep the underlying stream open. See the documentation for the ZipInputStream(Stream) constructor for a discussion of the class, and an example of how to use the class. The stream to read from. It must be readable. true if the application would like the stream to remain open after the ZipInputStream has been closed. Provides a string representation of the instance. This can be useful for debugging purposes. a string representation of the instance. The text encoding to use when reading entries into the zip archive, for those entries whose filenames or comments cannot be encoded with the default (IBM437) encoding. In its zip specification, PKWare describes two options for encoding filenames and comments: using IBM437 or UTF-8. But, some archiving tools or libraries do not follow the specification, and instead encode characters using the system default code page. For example, WinRAR when run on a machine in Shanghai may encode filenames with the Big-5 Chinese (950) code page. This behavior is contrary to the Zip specification, but it occurs anyway. When using DotNetZip to read zip archives that use something other than UTF-8 or IBM437, set this property to specify the code page to use when reading encoded filenames and comments for each ZipEntry in the zip file. This property is "provisional". When the entry in the zip archive is not explicitly marked as using UTF-8, then IBM437 is used to decode filenames and comments. If a loss of data would result from using IBM436 - specifically when encoding and decoding is not reflexive - the codepage specified here is used. It is possible, therefore, to have a given entry with a Comment encoded in IBM437 and a FileName encoded with the specified "provisional" codepage. When a zip file uses an arbitrary, non-UTF8 code page for encoding, there is no standard way for the reader application - whether DotNetZip, WinZip, WinRar, or something else - to know which codepage has been used for the entries. Readers of zip files are not able to inspect the zip file and determine the codepage that was used for the entries contained within it. It is left to the application or user to determine the necessary codepage when reading zip files encoded this way. If you use an incorrect codepage when reading a zipfile, you will get entries with filenames that are incorrect, and the incorrect filenames may even contain characters that are not legal for use within filenames in Windows. Extracting entries with illegal characters in the filenames will lead to exceptions. It's too bad, but this is just the way things are with code pages in zip files. Caveat Emptor. Size of the work buffer to use for the ZLIB codec during decompression. Setting this affects the performance and memory efficiency of compression and decompression. For larger files, setting this to a larger size may improve performance, but the exact numbers vary depending on available memory, and a bunch of other variables. I don't have good firm recommendations on how to set it. You'll have to test it yourself. Or just leave it alone and accept the default. Sets the password to be used on the ZipInputStream instance. When reading a zip archive, this password is used to read and decrypt the entries that are encrypted within the zip file. When entries within a zip file use different passwords, set the appropriate password for the entry before the first call to Read() for each entry. When reading an entry that is not encrypted, the value of this property is ignored. This example uses the ZipInputStream to read and extract entries from a zip file, using a potentially different password for each entry. byte[] buffer= new byte[2048]; int n; using (var raw = File.Open(_inputFileName, FileMode.Open, FileAccess.Read )) { using (var input= new ZipInputStream(raw)) { ZipEntry e; while (( e = input.GetNextEntry()) != null) { input.Password = PasswordForEntry(e.FileName); if (e.IsDirectory) continue; string outputPath = Path.Combine(_extractDir, e.FileName); using (var output = File.Open(outputPath, FileMode.Create, FileAccess.ReadWrite)) { while ((n= input.Read(buffer,0,buffer.Length)) > 0) { output.Write(buffer,0,n); } } } } } Read the data from the stream into the buffer. The data for the zipentry will be decrypted and uncompressed, as necessary, before being copied into the buffer. You must set the property before calling Read() the first time for an encrypted entry. To determine if an entry is encrypted and requires a password, check the ZipEntry.Encryption property. The buffer to hold the data read from the stream. the offset within the buffer to copy the first byte read. the number of bytes to read. the number of bytes read, after decryption and decompression. Read the next entry from the zip file. Call this method just before calling , to position the pointer in the zip file to the next entry that can be read. Subsequent calls to Read(), will decrypt and decompress the data in the zip file, until Read() returns 0. Each time you call GetNextEntry(), the pointer in the wrapped stream is moved to the next entry in the zip file. If you call , and thus re-position the pointer within the file, you will need to call GetNextEntry() again, to insure that the file pointer is positioned at the beginning of a zip entry. This method returns the ZipEntry. Using a stream approach, you will read the raw bytes for an entry in a zip file via calls to Read(). Alternatively, you can extract an entry into a file, or a stream, by calling , or one of its siblings. The ZipEntry read. Returns null (or Nothing in VB) if there are no more entries in the zip file. Dispose the stream. This method disposes the ZipInputStream. It may also close the underlying stream, depending on which constructor was used. Typically the application will call Dispose() implicitly, via a using statement in C#, or a Using statement in VB. Application code won't call this code directly. This method may be invoked in two distinct scenarios. If disposing == true, the method has been called directly or indirectly by a user's code, for example via the public Dispose() method. In this case, both managed and unmanaged resources can be referenced and disposed. If disposing == false, the method has been called by the runtime from inside the object finalizer and this method should not reference other objects; in that case only unmanaged resources must be referenced or disposed. true if the Dispose method was invoked by user code. Always returns true. Returns the value of CanSeek for the underlying (wrapped) stream. Always returns false. Returns the length of the underlying stream. Gets or sets the position of the underlying stream. Setting the position is equivalent to calling Seek(value, SeekOrigin.Begin). This is a no-op. This method always throws a NotSupportedException. ignored ignored ignored This method seeks in the underlying stream. Call this method if you want to seek around within the zip file for random access. Applications can intermix calls to Seek() with calls to . After a call to Seek(), GetNextEntry() will get the next ZipEntry that falls after the current position in the input stream. You're on your own for finding out just where to seek in the stream, to get to the various entries. the offset point to seek to the reference point from which to seek The new position This method always throws a NotSupportedException. ignored