Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web.Services/System/Web/Services/Protocols/SoapExtension.cs

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+//------------------------------------------------------------------------------
+// <copyright file="SoapExtension.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.Services.Protocols {
+    using System.Web.Services;
+    using System.Xml.Serialization;
+    using System;
+    using System.Reflection;
+    using System.Collections;
+    using System.IO;
+    using System.ComponentModel;
+
+    /// <include file='doc\SoapExtension.uex' path='docs/doc[@for="SoapExtension"]/*' />
+    public abstract class SoapExtension {
+
+        /// <include file='doc\SoapExtension.uex' path='docs/doc[@for="SoapExtension.GetInitializer"]/*' />
+        public abstract object GetInitializer(LogicalMethodInfo methodInfo, SoapExtensionAttribute attribute);
+
+        /// <include file='doc\SoapExtension.uex' path='docs/doc[@for="SoapExtension.GetInitializer1"]/*' />
+        public abstract object GetInitializer(Type serviceType);
+
+        /// <include file='doc\SoapExtension.uex' path='docs/doc[@for="SoapExtension.Initialize"]/*' />
+        public abstract void Initialize(object initializer);
+
+        /// <include file='doc\SoapExtension.uex' path='docs/doc[@for="SoapExtension.ProcessMessage"]/*' />
+        public abstract void ProcessMessage(SoapMessage message);
+        
+        /// <include file='doc\SoapExtension.uex' path='docs/doc[@for="SoapExtension.ChainStream"]/*' />
+        public virtual Stream ChainStream(Stream stream) {
+            return stream;
+        }
+    }
+
+}