Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.ServiceModel/System/ServiceModel/MessagePropertyAttribute.cs

@@ -0,0 +1,37 @@
+//-----------------------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//-----------------------------------------------------------------------------
+namespace System.ServiceModel
+{
+    [AttributeUsage(ServiceModelAttributeTargets.MessageMember, Inherited = false)]
+    public sealed class MessagePropertyAttribute : Attribute
+    {
+        string name;
+        bool isNameSetExplicit;
+
+        public MessagePropertyAttribute()
+        {
+        }
+
+        public string Name
+        {
+            get
+            {
+                return this.name;
+            }
+            set
+            {
+                isNameSetExplicit = true;
+                this.name = value;
+            }
+        }
+        internal bool IsNameSetExplicit
+        {
+            get
+            {
+                return isNameSetExplicit;
+            }
+        }
+    }
+}
+