Expose the Close method. (#2577)

Expose the Close method on ClientBase<TChannel>

src/System.ServiceModel.Primitives/ref/System.ServiceModel.Primitives.cs

@@ -133,6 +133,7 @@ event System.EventHandler System.ServiceModel.ICommunicationObject.Faulted { add
         event System.EventHandler System.ServiceModel.ICommunicationObject.Opened { add { } remove { } }
         event System.EventHandler System.ServiceModel.ICommunicationObject.Opening { add { } remove { } }
         public void Abort() { }
+        public void Close() { }
         protected virtual TChannel CreateChannel() { return default(TChannel); }
         protected T GetDefaultValueForInitialization<T>() { return default(T); }
         protected void InvokeAsync(System.ServiceModel.ClientBase<TChannel>.BeginOperationDelegate beginOperationDelegate, object[] inValues, System.ServiceModel.ClientBase<TChannel>.EndOperationDelegate endOperationDelegate, System.Threading.SendOrPostCallback operationCompletedCallback, object userState) { }

src/System.ServiceModel.Primitives/tests/ServiceModel/ClientBaseTest.cs

@@ -0,0 +1,51 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+
+using System;
+using System.Collections.Generic;
+using System.ServiceModel;
+using System.ServiceModel.Description;
+using System.ServiceModel.Channels;
+using System.Text;
+using Infrastructure.Common;
+using Xunit;
+
+public static class ClientBaseTest
+{
+    [WcfTheory]
+    public static void ClientBaseCloseMethodClosesCorrectly()
+    {
+        // *** SETUP *** \\
+        BasicHttpBinding binding = new BasicHttpBinding();
+        MyClientBase client = new MyClientBase(binding, new EndpointAddress("http://myendpoint"));
+
+        // *** VALIDATE *** \\
+        Assert.Equal(CommunicationState.Created, client.State);
+        client.Open();
+        Assert.Equal(CommunicationState.Opened, client.State);
+        client.Close();
+        Assert.Equal(CommunicationState.Closed, client.State);
+    }
+
+    public class MyClientBase : ClientBase<ITestService>
+    {
+        public MyClientBase(Binding binding, EndpointAddress endpointAddress)
+            : base(binding, endpointAddress)
+        {
+        }
+
+        public ITestService Proxy
+        {
+            get { return base.Channel; }
+        }
+    }
+
+    [ServiceContract]
+    public interface ITestService
+    {
+        [OperationContract]
+        string Echo(string message);
+    }
+}