Silverlight与WCF的双工通信

项目结构图示下： 细节点A：原服务端的EndPoint的配置在新的创建基于双工通信的服务中已经被代码代替。Codepublic class PollingDuplexServiceHost:ServiceHost { public PollingDuplexServiceHost(params Uri[] address) { base.InitializeDescription(typeof(OrderService),new UriSchemeKeyedCollection(address)); } protected override void InitializeRuntime() { PollingDuplexBindingElement pdbe = new PollingDuplexBindingElement() { ServerPollTimeout = TimeSpan.FromSeconds(3), InactivityTimeout = TimeSpan.FromMinutes(1) }; // Add an endpoint for the given service contract. this.AddServiceEndpoint( typeof(IDuplexService), new CustomBinding( pdbe, new BinaryMessageEncodingBindingElement(), new HttpTransportBindingElement()), ""); base.InitializeRuntime(); } }看过MSDN上服务端代码的朋友，一定知道了此处代码是给该ServiceHost添加服务EndPoint，并且整个Service端的服务初始化已经完全交给了Code public class PollingDuplexServiceHostFactory:ServiceHostFactoryBase { public override ServiceHostBase CreateServiceHost(string constructorString, Uri[] baseAddresses) { return new PollingDuplexServiceHost(baseAddresses); } } <%@ ServiceHost Language="C#" Debug="true" Factory="WcfServiceApp.PollingDuplexServiceHostFactory" %>也就是说在基本WCF开发的方式中给Web.config中添加的EndPoint节点内容是必须要去除的Code<system.serviceModel> <services> <service name="WcfServiceApp.OrderService" behaviorConfiguration="WcfServiceApp.Service1Behavior"> <!--<endpoint address="" binding="basicHttpBinding" contract="WcfDuplexContract.IDuplexService"> <identity> <dns value="localhost"/> </identity> </endpoint>--> <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/> </service> </services> <behaviors> <serviceBehaviors> <behavior name="WcfServiceApp.Service1Behavior"> <serviceMetadata httpGetEnabled="true"/> <serviceDebug includeExceptionDetailInFaults="false"/> </behavior> </serviceBehaviors> </behaviors> </system.serviceModel>如果没有去除的话，在初始化ServiceHost时就会得到重复创建服务EndPoint的错误。细节点2:在客户端消费WCF中，原方式在初始化Client在应用了WCF服务后，必须在其生成的ServiceReferences.ClientConfig中指定对应的<system.serviceModel>节点作为初始化Client端EndPoint的所需条件，但是在消费双工服务的初始化已经被如下代码所替代CodePollingDuplexHttpBinding binding = new PollingDuplexHttpBinding(){ InactivityTimeout = TimeSpan.FromMinutes(1)};EndpointAddress address = new EndpointAddress("http://localhost/WCFService/OrderService.svc");client = new DuplexServiceClient(binding, address);当然我没有尝试通过配置来初始化双工服务，有兴趣的朋友可以去尝试配置来初始化双工服务。（猜想应该是可行的）有了上面的这些调整后，一个消费WCF的双工服务基本就成型了。下面就是看看客户端真正怎么调用的问题了。在这里我基本就是傻瓜开发了，哈！由于在Silverlight客户端已经引用了WCF的服务，所以这里加客户端代码就很简单了，当然如果有兴趣的朋友就真的应该好好看看MSND上的客户端实例，这个代码基本上把调用双工服务中的细节都实现了，完全没有依靠自动工具的实现，对于想了解细节的朋友应该是有些帮助了。最后我就把我自己简陋的客户端代码Share下，就是想告诉大家，客户端代码如果使用了引用服务后的自动代码就可以写自己很简单的客户端。 Codevoid MainPage_Loaded(object sender, RoutedEventArgs e){PollingDuplexHttpBinding binding = new PollingDuplexHttpBinding(){InactivityTimeout = TimeSpan.FromMinutes(1)};EndpointAddress address = new EndpointAddress("http://localhost/WCFService/OrderService.svc");client = new DuplexServiceClient(binding, address);client.OrderCompleted += new EventHandler<System.ComponentModel.AsyncCompletedEventArgs>(client_OrderCompleted);client.ReceiveReceived += new EventHandler<ReceiveReceivedEventArgs>(client_ReceiveReceived);this.txtData.Text = this.txtData.Text + "Client State is Initial After " + client.State.ToString() + "/r/n";}private void Button_Click(object sender, RoutedEventArgs e){双工通信实现#region 双工通信实现string Text = "DoText";Message message = Message.CreateMessage( MessageVersion.Soap12WSAddressing10, "Silverlight/IDuplexService/Order",Text); this.txtData.Text = this.txtData.Text + "Client State is Open Before: " + client.State.ToString() + "/r/n";client.OpenAsync();this.txtData.Text = this.txtData.Text + "Client State is Open After,Order Before " + client.State.ToString() + "/r/n";client.OrderAsync(message);this.txtData.Text = this.txtData.Text + "Client State is Order After " + client.State.T, oString() + "/r/n";#endregion}void client_ReceiveReceived(object sender, ReceiveReceivedEventArgs e){this.txtData.Text = this.txtData.Text + "Receive Client Receive Complete is running " + client.State.ToString() + "/r/n";this.txtData.Text = this.txtData.Text + "Recieve Message " + e.request.GetBody<string>() + "/r/n";}void client_OrderCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e){this.txtData.Text = this.txtData.Text + "Client State is Order Complete is running " + client.State.ToString() + "/r/n";} 现在一个消费WCF双工服务的Silverlight客户端就基本完工了，对于服务端的实现，我就不单独再贴了，因为同原服务端实例没有太大的区别了。最后这个消费方式就完全可以跑通了，哈！架子虽然完全搭好了，不过发现完全要实现我的Web象棋还需要做很多工作要做，这个就是后续的工作了。感兴趣的朋友尽情期待！谢谢！