客户端：
DuplexService.xaml <UserControl x:Class="Silverlight20.Communication.DuplexService"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<StackPanel HorizontalAlignment="left" margin="5">
<TextBox x:name="txtStockCode" Text="请输入股票代码" margin="5" />
<button x:name="btnsubmit" Content="获取股票信息" Click="btnsubmit_Click" margin="5" />
<button x:name="btnStop" Content="停止获取" Click="btnStop_Click" margin="5" />
<TextBlock x:name="lblStockMessage" margin="5" />
</StackPanel>
</UserControl> DuplexService.xaml.cs using System;
using System.Collections.Generic;
using System.linq;
using System.Net;
using System.windows;
using System.windows.Controls;
using System.windows.documents;
using System.windows.input;
using System.windows.Media;
using System.windows.Media.Animation;
using System.windows.Shapes;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Threading;
using System.IO;
namespace Silverlight20.Communication
{
public partial class DuplexService : UserControl
{
SynchronizationContext _syncContext;
// 是否接收服务端发送过来的消息
bool _status = true;
public DuplexService()
{
InitializeComponent();
}
private voID btnsubmit_Click( object sender,RoutedEventArgs e)
{
_status = true;
// UI 线程
_syncContext = SynchronizationContext.Current;
PollingDuplexhttpBinding binding = new PollingDuplexhttpBinding()
{
// InactivityTimeout - 服务端与客户端在此超时时间内无任何消息交换的情况下，服务会关闭其会话
InactivityTimeout = TimeSpan.FromMinutes(1)
};
// 构造 IDuplexSessionChannel 的信道工厂
IChannelFactory<IDuplexSessionChannel> factory =
binding.BuildChannelFactory<IDuplexSessionChannel>( new BindingParameterCollection());
// 打开信道工厂
IAsyncResult factoryOpenResult =
factory.Beginopen( new AsyncCallback(OnopenCompleteFactory),factory);
if (factoryOpenResult.CompletedSynchronously)
{
// 如果信道工厂被打开的这个 异步 *** 作 已经被 同步完成 则执行下一步
CompleteOpenFactory(factoryOpenResult);
}
}
private voID btnStop_Click( object sender,RoutedEventArgs e)
{
_status = false;
}
voID OnopenCompleteFactory(IAsyncResult result)
{
// 该异步 *** 作已被同步完成的话则不做任何 *** 作，反之则执行下一步
if (result.CompletedSynchronously)
return;
else
CompleteOpenFactory(result);
}
voID CompleteOpenFactory(IAsyncResult result)
{
IChannelFactory<IDuplexSessionChannel> factory = result.AsyncState as IChannelFactory<IDuplexSessionChannel>;
// 完成异步 *** 作，以打开信道工厂
factory.EndOpen(result);
// 在信道工厂上根据指定的地址创建信道
IDuplexSessionChannel channel =
factory.CreateChannel( new EndpointAddress( "http://localhost:3036/DuplexService.svc"));
// 打开信道
IAsyncResult channelOpenResult =
channel.Beginopen(new AsyncCallback(OnopenCompleteChannel),channel);
if (channelOpenResult.CompletedSynchronously)
{
// 如果信道被打开的这个 异步 *** 作 已经被 同步完成 则执行下一步
CompleteOpenChannel(channelOpenResult);
}
}
voID OnopenCompleteChannel(IAsyncResult result)
{
// 该异步 *** 作已被同步完成的话则不做任何 *** 作，反之则执行下一步
if (result.CompletedSynchronously)
return;
else
CompleteOpenChannel(result);
}
voID CompleteOpenChannel(IAsyncResult result)
{
IDuplexSessionChannel channel = result.AsyncState as IDuplexSessionChannel;
// 完成异步 *** 作，以打开信道
channel.EndOpen(result);
// 构造需要发送到服务端的 System.ServiceModel.Channels.Message （客户端终结点与服务端终结点之间的通信单元）
Message message = Message.CreateMessage(
channel.GetProperty<MessageVersion>(),// MessageVersion.soap11 （Duplex 服务仅支持 Soap11）
"Silverlight20/IDuplexService/SendStockCode",// Action 为请求的目的地（需要执行的某行为的路径）
txtStockCode.Text);
// 向目的地发送消息
IAsyncResult resultChannel =
channel.BeginSend(message,new AsyncCallback(OnSend),channel);
if (resultChannel.CompletedSynchronously)
{
// 如果向目的地发送消息的这个 异步 *** 作 已经被 同步完成 则执行下一步
CompleteOnSend(resultChannel);
}
// 监听指定的信道，用于接收返回的消息
ReceiveLoop(channel);
}
voID OnSend(IAsyncResult result)
{
// 该异步 *** 作已被同步完成的话则不做任何 *** 作，反之则执行下一步
if (result.CompletedSynchronously)
return;
else
CompleteOnSend(result);
}
voID CompleteOnSend(IAsyncResult result)
{
try
{
IDuplexSessionChannel channel = (IDuplexSessionChannel)result.AsyncState;
// 完成异步 *** 作，以完成向目的地发送消息的 *** 作
channel.EndSend(result);
}
catch (Exception ex)
{
_syncContext.Post(WriteText,ex.ToString() + Environment.Newline);
}
}
voID ReceiveLoop(IDuplexSessionChannel channel)
{
// 监听指定的信道，用于接收返回的消息
IAsyncResult result =
channel.BeginReceive(new AsyncCallback(OnReceiveComplete),channel);
if (result.CompletedSynchronously)
{
CompleteReceive(result);
}
}
voID OnReceiveComplete(IAsyncResult result)
{
if (result.CompletedSynchronously)
return;
else
CompleteReceive(result);
}
voID CompleteReceive(IAsyncResult result)
{
IDuplexSessionChannel channel = (IDuplexSessionChannel)result.AsyncState;
try
{
// 完成异步 *** 作，以接收到服务端发过来的消息
Message receivedMessage = channel.EndReceive(result);
if (receivedMessage == null)
{
// 服务端会话已被关闭
// 此时应该关闭客户端会话，或向服务端发送消息以启动一个新的会话
}
else
{
// 将接收到的信息输出到界面上
string text = receivedMessage.Getbody<string>();
_syncContext.Post(WriteText,text + Environment.Newline);
if (!_status)
{
// 关闭信道
IAsyncResult resultFactory =
channel.BeginClose(new AsyncCallback(OnCloseChannel),channel);
if (resultFactory.CompletedSynchronously)
{
CompleteCloseChannel(result);
}
}
else
{
// 继续监听指定的信道，用于接收返回的消息
ReceiveLoop(channel);
}
}
}
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();
}
}
}
voID OnCloseChannel(IAsyncResult result)
{
if (result.CompletedSynchronously)
return;
else
CompleteCloseChannel(result);
}
voID CompleteCloseChannel(IAsyncResult result)
{
IDuplexSessionChannel channel = (IDuplexSessionChannel)result.AsyncState;
// 完成异步 *** 作，以关闭信道
channel.EndClose(result);
}
voID WriteText(object text)
{
// 将信息打到界面上
lblStockMessage.Text += (string)text;
}
}
} OK
[源码下载] 总结
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