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Silverlight(23) - 2.0通信之调用WCF的双向通信(Duplex Service)

 2008-12-18 11:54:25 来源:WEB开发网   
核心提示: DuplexService.csusing System;using System.Collections.Generic;using System.Linq;using System.Runtime.Serialization;using System.ServiceModel;usin

DuplexService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
  
using System.ServiceModel.Channels;
using System.Threading;
using System.ServiceModel.Activation;
using System.IO;
  
/**//// <summary>
/// Duplex 服务的服务端的实现
/// 本文以客户端向服务端提交股票代码,服务端定时向客户端发送股票信息为例
/// </summary>
public class DuplexService : IDuplexService
{
  IDuplexClient _client;
  bool _status = true;
  
  /**//// <summary>
  /// 客户端向服务端发送股票代码的方法
  /// </summary>
  /// <param name="receivedMessage">包含股票代码的 System.ServiceModel.Channels.Message </param>
  public void SendStockCode(Message receivedMessage)
  {
    // 获取当前上下文的回调信道
    _client = OperationContext.Current.GetCallbackChannel<IDuplexClient>();
  
    // 如果发生错误则不再执行
    OperationContext.Current.Channel.Faulted += new EventHandler(delegate { _status = false; });
  
    // 获取用户提交的股票代码
    string stockCode = receivedMessage.GetBody<string>();
  
    // 每3秒向客户端发送一次股票信息
    while (_status)
    {
      // 构造需要发送到客户端的 System.ServiceModel.Channels.Message
      // Duplex 服务仅支持 Soap11 , Action 为请求的目的地(需要执行的某行为的路径)
      Message stockMessage = Message.CreateMessage(
        MessageVersion.Soap11,
        "Silverlight20/IDuplexService/ReceiveStockMessage",
        string.Format("StockCode: {0}; StockPrice: {1}; CurrentTime: {2}",
          stockCode,
          new Random().Next(1, 200),
          DateTime.Now.ToString()));
  
      try
      {
        // 向客户端“推”数据
        _client.ReceiveStockMessage(stockMessage);
      }
      catch (Exception ex)
      {
        // 出错则记日志
        using (StreamWriter sw = new StreamWriter(@"C:Silverlight_Duplex_Log.txt", true))
        {
          sw.Write(ex.ToString());
          sw.WriteLine();
        }
      }
  
      System.Threading.Thread.Sleep(3000);
    }
  }
}

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Tags:Silverlight 通信 调用

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