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DuplexService.svc
<%@ ServiceHost Language="C#" Debug="true" Service="DuplexService" CodeBehind="~/App_Code/DuplexService.cs" Factory="PollingDuplexServiceHostFactory" %>
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 异步操作 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)
{
// 该异步操作已被同步完成的话则不做任何操作,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>;
// 完成异步操作,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 异步操作 已经被 同步完成 则执行下一步
CompleteOpenChannel(channelOpenResult);
}
}
void OnOpenCompleteChannel(IAsyncResult result)
{
// 该异步操作已被同步完成的话则不做任何操作,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;
// 完成异步操作,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 异步操作 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)
{
// 该异步操作已被同步完成的话则不做任何操作,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;
// 完成异步操作,以完成向目的地发送消息的操作
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
{
// 完成异步操作,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;
// 完成异步操作,以关闭信道
channel.EndClose(result);
}
void WriteText(object text)
{
// 将信息打到界面上
lblStockMessage.Text += (string)text;
}
}
}
Tags:Silverlight 通信 调用
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