Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.ServiceModel/System/ServiceModel/Channels/MessageEncoderFactory.cs

@@ -0,0 +1,29 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+namespace System.ServiceModel.Channels
+{
+    using System;
+
+    public abstract class MessageEncoderFactory
+    {
+        protected MessageEncoderFactory()
+        {
+        }
+
+        public abstract MessageEncoder Encoder
+        {
+            get;
+        }
+
+        public abstract MessageVersion MessageVersion
+        {
+            get;
+        }
+
+        public virtual MessageEncoder CreateSessionEncoder()
+        {
+            return Encoder;
+        }
+    }
+}