Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.ServiceModel/System/ServiceModel/ComIntegration/TearOffProxy.cs

@@ -0,0 +1,74 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+namespace System.ServiceModel.ComIntegration
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Reflection;
+    using System.Runtime;
+    using System.Runtime.InteropServices;
+    using System.Runtime.Remoting;
+    using System.Runtime.Remoting.Messaging;
+    using System.Runtime.Remoting.Proxies;
+    using System.ServiceModel;
+
+    class TearOffProxy : RealProxy, IDisposable
+    {
+        ICreateServiceChannel serviceChannelCreator;
+        Dictionary<MethodBase, MethodBase> baseTypeToInterfaceMethod;
+        internal TearOffProxy(ICreateServiceChannel serviceChannelCreator, Type proxiedType)
+            : base(proxiedType)
+        {
+            if (serviceChannelCreator == null)
+            {
+                throw Fx.AssertAndThrow("ServiceChannelCreator cannot be null");
+            }
+            this.serviceChannelCreator = serviceChannelCreator;
+            baseTypeToInterfaceMethod = new Dictionary<MethodBase, MethodBase>();
+        }
+
+        public override IMessage Invoke(IMessage message)
+        {
+
+            RealProxy delegatingProxy = null;
+            IMethodCallMessage msg = message as IMethodCallMessage;
+            try
+            {
+                delegatingProxy = serviceChannelCreator.CreateChannel();
+            }
+            catch (Exception e)
+            {
+                if (Fx.IsFatal(e))
+                    throw;
+
+                return new ReturnMessage(DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(e.GetBaseException().Message, Marshal.GetHRForException(e.GetBaseException()))), msg);
+            }
+
+            MethodBase typeMethod = msg.MethodBase;
+            IRemotingTypeInfo typeInfo = delegatingProxy as IRemotingTypeInfo;
+            if (typeInfo == null)
+            {
+                throw Fx.AssertAndThrow("Type Info cannot be null");
+            }
+            if (typeInfo.CanCastTo(typeMethod.DeclaringType, null))
+            {
+                IMessage msgReturned = delegatingProxy.Invoke(message);
+                ReturnMessage returnMsg = msgReturned as ReturnMessage;
+                if ((returnMsg == null) || (returnMsg.Exception == null))
+                    return msgReturned;
+                else
+                    return new ReturnMessage(DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(returnMsg.Exception.GetBaseException().Message, Marshal.GetHRForException(returnMsg.Exception.GetBaseException()))), msg);
+            }
+            else
+            {
+                return new ReturnMessage(DiagnosticUtility.ExceptionUtility.ThrowHelperError(new COMException(SR.GetString(SR.OperationNotFound, typeMethod.Name), HR.DISP_E_UNKNOWNNAME)), msg);
+            }
+        }
+
+        void IDisposable.Dispose()
+        {
+            serviceChannelCreator = null;
+        }
+    }
+}