1 files changed, 38 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/Runtime/InteropServices/ICustomQueryInterface.cs b/src/mscorlib/src/System/Runtime/InteropServices/ICustomQueryInterface.cs
new file mode 100644
index 0000000000..b6c057be02
--- /dev/null
+++ b/src/mscorlib/src/System/Runtime/InteropServices/ICustomQueryInterface.cs
@@ -0,0 +1,38 @@
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+/*=============================================================================
+**
+**
+**
+** Purpose: This the interface that be implemented by class that want to 
+**          customize the behavior of QueryInterface.
+**
+**
+=============================================================================*/
+
+namespace System.Runtime.InteropServices {
+    using System;
+
+    //====================================================================
+    // The enum of the return value of IQuerable.GetInterface
+    //====================================================================
+    [Serializable]
+    [System.Runtime.InteropServices.ComVisible(false)]
+    public enum CustomQueryInterfaceResult
+    {
+        Handled                 = 0,
+        NotHandled              = 1,
+        Failed                  = 2,
+    }
+
+    //====================================================================
+    // The interface for customizing IQueryInterface
+    //====================================================================
+    [System.Runtime.InteropServices.ComVisible(false)]
+    public interface ICustomQueryInterface
+    {
+        [System.Security.SecurityCritical]
+        CustomQueryInterfaceResult GetInterface([In]ref Guid iid, out IntPtr ppv);
+    }
+}