Silverlight与WCF之间的通信(1)SL客户端定时请求WCF服务

这几天在做一个Silverlight的页面聊天工具，基本上从头看了一遍Silverlight和WCF相关的东西，也遇到了不少问题，刚开始是用Silverlight做了定时请求服务器的数据信息，后期准备利用WCF的双工通信来做，通信过程分为两个部分记录。

一 ，需要建立一个WCF的服务端

这里直接在Silverlight的站点中新建了一个WCF服务，代码如下：




代码

//先定义服务契约

[ServiceContract]

public interface IChatService

{

[OperationContract]

bool SendMessage(MessageInfo msg);

[OperationContract]

List<MessageInfo> GetMessages(string UserAccount);

}

//再定义数据契约

[DataContract]

public class MessageInfo

{

[DataMember]

public string ID { set; get; }

[DataMember]

public string Title { set; get; }

[DataMember]

public string Message { set; get; }

[DataMember]

public DateTime SendTime { set; get; }

[DataMember]

public DateTime? ReadTime { set; get; }

[DataMember]

public string Sender { set; get; }

[DataMember]

public string ReceiveUser { set; get; }

[DataMember]

public string ReceiveOrgan { set; get; }

[DataMember]

public string ReceiveMode { set; get; }

[DataMember]

public int State { set; get; }

[DataMember]

public int Receipt { set; get; }

[DataMember]

public string Source { set; get; }

}

//最后在webconfig中配置好服务

<system.serviceModel>

<behaviors>

<serviceBehaviors>

<behavior name="ChatBehavior">

<serviceMetadata httpGetEnabled="true" />

<serviceDebug includeExceptionDetailInFaults="false" />

</behavior>

</serviceBehaviors>

</behaviors>

<services>

<service behaviorConfiguration="ChatBehavior" name="WebChat.Web.ChatService">

<endpoint address="" binding="basicHttpBinding" contract="WebChat.Web.IChatService"></endpoint>

</service>

</services>

<serviceHostingEnvironment multipleSiteBindingsEnabled="true" />

</system.serviceModel>

到这里呢，一个服务就Host在IIS上了，可以通过浏览服务或服务引用进行验证服务是否正常运行。





二，在Silverlight中向服务器请求数据




代码

public partial class MainPage : UserControl

{

Timer timer;

ChatService.ChatServiceClient proxy;

BasicHttpBinding binding;

EndpointAddress endPoint;

public MainPage()

{

InitializeComponent();

binding = new BasicHttpBinding();

endPoint = new EndpointAddress("http://localhost:1939/ChatService.svc%22);

timer = new Timer(new TimerCallback(GetMessages),this,100,100);

}

#region 定时检测信息

public void GetMessages(object obj)

{

proxy = new ChatService.ChatServiceClient(binding, endPoint);

proxy.GetMessagesCompleted += new EventHandler<ChatService.GetMessagesCompletedEventArgs>(GetMessagesComleted);

proxy.GetMessagesAsync("wengyuli");

}

void GetMessagesComleted(object sender, ChatService.GetMessagesCompletedEventArgs e)

{

if(e.Error==null)

{

if (this.listMsgs.Dispatcher.CheckAccess())

{

this.listMsgs.ItemsSource= e.Result;

}

else

{

this.listMsgs.Dispatcher.BeginInvoke(() => { this.listMsgs.ItemsSource = e.Result; });

}

}

}

#endregion

#region 发送信息

private void btnSend_Click(object sender, RoutedEventArgs e)

{

ChatService.MessageInfo message = new ChatService.MessageInfo();

message.ID = Guid.NewGuid().ToString();

message.Receipt = 0;

message.ReceiveMode = "user";

message.ReceiveOrgan = "";

message.ReceiveUser = "xiejianjun";

message.Message = this.txtMessage.Text;

message.Sender = "wengyuli";

message.SendTime = DateTime.Now;

message.Source = "web";

message.State = 0;

message.Title = this.txtMessage.Text;

proxy = new ChatService.ChatServiceClient(binding, endPoint);

proxy.SendMessageCompleted += new EventHandler<ChatService.SendMessageCompletedEventArgs>(SendMessageComleted);

proxy.SendMessageAsync(message);

}

void SendMessageComleted(object sender,ChatService.SendMessageCompletedEventArgs e)

{

if (e.Error == null)

{

//MessageBox.Show("服务器返回结果：" + e.Result);

}

}

#endregion

}

前台：

<ListBox Height="213" HorizontalAlignment="Left" DisplayMemberPath="Message" ItemsSource="{Binding MessageInfo}" Name="listMsgs" VerticalAlignment="Top" Width="283" ></ListBox>

编译并运行后得到数据：