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mscorlib/System/Runtime/InteropServices/ExtensibleClassFactory.cs

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+using System;
+using System.Collections;
+using System.Diagnostics;
+using System.Reflection;
+
+namespace System.Runtime.InteropServices
+{
+	/// <summary>Enables customization of managed objects that extend from unmanaged objects during creation.</summary>
+	// Token: 0x02000310 RID: 784
+	[ComVisible(true)]
+	public sealed class ExtensibleClassFactory
+	{
+		// Token: 0x060021F5 RID: 8693 RVA: 0x00079448 File Offset: 0x00077648
+		private ExtensibleClassFactory()
+		{
+		}
+
+		// Token: 0x060021F7 RID: 8695 RVA: 0x0007945C File Offset: 0x0007765C
+		internal static ObjectCreationDelegate GetObjectCreationCallback(Type t)
+		{
+			return ExtensibleClassFactory.hashtable[t] as ObjectCreationDelegate;
+		}
+
+		/// <summary>Registers a delegate that is called when an instance of a managed type, that extends from an unmanaged type, needs to allocate the aggregated unmanaged object.</summary>
+		/// <param name="callback">A delegate that is called in place of CoCreateInstance. </param>
+		// Token: 0x060021F8 RID: 8696 RVA: 0x00079470 File Offset: 0x00077670
+		public static void RegisterObjectCreationCallback(ObjectCreationDelegate callback)
+		{
+			int i = 1;
+			StackTrace stackTrace = new StackTrace(false);
+			while (i < stackTrace.FrameCount)
+			{
+				StackFrame frame = stackTrace.GetFrame(i);
+				MethodBase method = frame.GetMethod();
+				if (method.MemberType == MemberTypes.Constructor && method.IsStatic)
+				{
+					ExtensibleClassFactory.hashtable.Add(method.DeclaringType, callback);
+					return;
+				}
+				i++;
+			}
+			throw new InvalidOperationException("RegisterObjectCreationCallback must be called from .cctor of class derived from ComImport type.");
+		}
+
+		// Token: 0x04000D18 RID: 3352
+		private static Hashtable hashtable = new Hashtable();
+	}
+}