1 files changed, 23 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/ICustomAdapter.cs b/src/mscorlib/src/System/Runtime/InteropServices/ICustomAdapter.cs
new file mode 100644
index 0000000000..00abf7b3bf
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/InteropServices/ICustomAdapter.cs
@@ -0,0 +1,23 @@
+// 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: This the base interface that custom adapters can chose to implement
+**          when they want to expose the underlying object.
+**
+**
+=============================================================================*/
+
+namespace System.Runtime.InteropServices {
+    using System;
+
+[System.Runtime.InteropServices.ComVisible(true)]
+    public interface ICustomAdapter
+    {        
+        [return:MarshalAs(UnmanagedType.IUnknown)] Object GetUnderlyingObject();
+    }
+}