net.peeweek.gameplay-ingredients/Runtime/TypeUtility.cs

using System;
using System.Collections.Generic;
using UnityEngine;

namespace GameplayIngredients
{
    public static class TypeUtility
    {
        public static Type[] GetConcreteTypes<T>()
        {
            List<Type> types = new List<Type>();
            foreach (var assembly in AppDomain.CurrentDomain.GetAssemblies())
            {
                Type[] assemblyTypes = null;

                try
                {
                    assemblyTypes = assembly.GetTypes();
                }
                catch
                {
                    Debug.LogError($"Could not load types from assembly : {assembly.FullName}");
                }

                if (assemblyTypes != null)
                {
                    foreach (Type t in assemblyTypes)
                    {
                        if (typeof(T).IsAssignableFrom(t) && !t.IsAbstract)
                        {
                            types.Add(t);
                        }
                    }
                }

            }
            return types.ToArray();
        }
    }

}