Remove Match(GraphChange) utility function

MaterialGraphProject/Assets/GraphFramework/SerializableGraph/Editor/Interfaces/GraphChange.cs

 
         public IEdge edge { get; private set; }
     }
-
-    public static class GraphChangeExtensions
-    {
-        public static void Match(this GraphChange change,
-            Action<NodeAddedGraphChange> nodeAdded = null,
-            Action<NodeRemovedGraphChange> nodeRemoved = null,
-            Action<EdgeAddedGraphChange> edgeAdded = null,
-            Action<EdgeRemovedGraphChange> edgeRemoved = null)
-        {
-            if (change is NodeAddedGraphChange && nodeAdded != null)
-                nodeAdded((NodeAddedGraphChange)change);
-            else if (change is NodeRemovedGraphChange && nodeRemoved != null)
-                nodeRemoved((NodeRemovedGraphChange)change);
-            else if (change is EdgeAddedGraphChange && edgeAdded != null)
-                edgeAdded((EdgeAddedGraphChange)change);
-            else if (change is EdgeRemovedGraphChange && edgeRemoved != null)
-                edgeRemoved((EdgeRemovedGraphChange)change);
-        }
-    }
 }

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/Presenters/MaterialGraphPresenter.cs

 
         public IGraph graph { get; private set; }
 
-        protected MaterialGraphPresenter()
-        {
-        }
+        protected MaterialGraphPresenter() { }
 
         public override List<NodeAnchorPresenter> GetCompatibleAnchors(NodeAnchorPresenter startAnchor, NodeAdapter nodeAdapter)
         {
 
         void OnChange(GraphChange change)
         {
-            change.Match(NodeAdded, NodeRemoved, EdgeAdded, EdgeRemoved);
+            var nodeAdded = change as NodeAddedGraphChange;
+            if (nodeAdded != null)
+                NodeAdded(nodeAdded);
+
+            var nodeRemoved = change as NodeRemovedGraphChange;
+            if (nodeRemoved != null)
+                NodeRemoved(nodeRemoved);
+
+            var edgeAdded = change as EdgeAddedGraphChange;
+            if (edgeAdded != null)
+                EdgeAdded(edgeAdded);
+
+            var edgeRemoved = change as EdgeRemovedGraphChange;
+            if (edgeRemoved != null)
+                EdgeRemoved(edgeRemoved);
         }
 
         void NodeAdded(NodeAddedGraphChange change)

MaterialGraphProject/Assets/UnityShaderEditor/Editor/Drawing/PreviewSystem.cs

 
         void OnGraphChange(GraphChange change)
         {
-            change.Match(
-                nodeAdded: c => AddPreview(c.node),
-                nodeRemoved: c => RemovePreview(c.node),
-                edgeAdded: c => m_DirtyShaders.Add(c.edge.inputSlot.nodeGuid),
-                edgeRemoved: c => m_DirtyShaders.Add(c.edge.inputSlot.nodeGuid));
+            var nodeAdded = change as NodeAddedGraphChange;
+            if (nodeAdded != null)
+                AddPreview(nodeAdded.node);
+
+            var nodeRemoved = change as NodeRemovedGraphChange;
+            if (nodeRemoved != null)
+                RemovePreview(nodeRemoved.node);
+
+            var edgeAdded = change as EdgeAddedGraphChange;
+            if (edgeAdded != null)
+                m_DirtyShaders.Add(edgeAdded.edge.inputSlot.nodeGuid);
+
+            var edgeRemoved = change as EdgeRemovedGraphChange;
+            if (edgeRemoved != null)
+                m_DirtyShaders.Add(edgeRemoved.edge.inputSlot.nodeGuid);
         }
 
         void AddPreview(INode node)