Silverlight与WCF之间的通信(1)SL客户端定时请求WCF服务

// 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 >

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  
    }