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
    }

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