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： 

//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 

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：