Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.ServiceModel/System/ServiceModel/WSMessageEncoding.cs

@@ -0,0 +1,30 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+namespace System.ServiceModel
+{
+    using System.ServiceModel.Channels;
+
+    public enum WSMessageEncoding
+    {
+        Text = 0,
+        Mtom,
+    }
+
+    static class WSMessageEncodingHelper
+    {
+        internal static bool IsDefined(WSMessageEncoding value)
+        {
+            return
+                value == WSMessageEncoding.Text
+                || value == WSMessageEncoding.Mtom;
+        }
+        internal static void SyncUpEncodingBindingElementProperties(TextMessageEncodingBindingElement textEncoding, MtomMessageEncodingBindingElement mtomEncoding)
+        {
+            // textEncoding provides the backing store for ReaderQuotas and WriteEncoding,
+            // we must ensure same values propogate to mtomEncoding
+            textEncoding.ReaderQuotas.CopyTo(mtomEncoding.ReaderQuotas);
+            mtomEncoding.WriteEncoding = textEncoding.WriteEncoding;
+        }
+    }
+}