1 files changed, 41 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/ExtensibleClassFactory.cs b/src/mscorlib/src/System/Runtime/InteropServices/ExtensibleClassFactory.cs
new file mode 100644
index 0000000000..62718de757
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/InteropServices/ExtensibleClassFactory.cs
@@ -0,0 +1,41 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*=============================================================================
+**
+**
+**
+** Purpose: Methods used to customize the creation of managed objects that
+**          extend from unmanaged objects.
+**
+**
+=============================================================================*/
+
+namespace System.Runtime.InteropServices {
+    using System.Runtime.InteropServices;
+    using System.Runtime.Remoting;
+    using System.Runtime.CompilerServices;
+    using System.Runtime.Versioning;
+
+    using System;
+[System.Runtime.InteropServices.ComVisible(true)]
+    public sealed class ExtensibleClassFactory
+    {
+    
+        // Prevent instantiation.
+        private ExtensibleClassFactory() {}
+    
+        // Register a delegate that will be called whenever an instance of a managed
+        // type that extends from an unmanaged type needs to allocate the aggregated
+        // unmanaged object. This delegate is expected to allocate and aggregate the
+        // unmanaged object and is called in place of a CoCreateInstance. This
+        // routine must be called in the context of the static initializer for the
+        // class for which the callbacks will be made. 
+        // It is not legal to register this callback from a class that has any
+        // parents that have already registered a callback.
+        [System.Security.SecuritySafeCritical]  // auto-generated
+        [MethodImplAttribute(MethodImplOptions.InternalCall)]
+        public static extern void RegisterObjectCreationCallback(ObjectCreationDelegate callback);
+    }
+}