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稳扎稳打Silverlight(53) - 4.0通信之对WCF NetTcpBinding的支持, 在Socket通信中通过HTTP检索策略文件, HTTP请求中的ClientHttp和BrowserHttp



作者:webabcd


介绍
Silverlight 4.0 通信方面的增强:

  • NetTcpBinding - 通过  NetTcpBinding 与 WCF 服务进行通信
  • 支持在 Socket 通信中通过 HTTP 的方式检索策略文件 
  • HTTP 请求中的 ClientHttp 方式和 BrowserHttp 方式的应用



在线DEMO
http://www.cnblogs.com/webabcd/archive/2010/08/09/1795417.html


示例
1、演示如何通过 NetTcpBinding 与 WCF 进行双向通信
服务端:
IDuplex.cs

代码
/*
 * 双向通信的 Contract
 
*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.ServiceModel;

namespace SocketServer
{
    [ServiceContract(CallbackContract 
= typeof(IDuplexCallback))]
    
public interface IDuplex
    {
        [OperationContract(IsOneWay 
= true)]
        
void HelloDuplex(string msg);
    }

    
public interface IDuplexCallback
    {
        [OperationContract(IsOneWay 
= true)]
        
void HelloDuplexCallback(string msg);
    }
}


Duplex.cs

代码
/*
 * 实现 IDuplex 契约
 
*/

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

using System.ServiceModel;

namespace SocketServer
{
    
public class Duplex : IDuplex
    {
        
private IDuplexCallback _callback;

        
// 服务端方法,其用于被客户端调用
        public void HelloDuplex(string msg)
        {
            Program.Form1.ShowMessage(msg);

            
if (_callback == null)
            {
                
// 实例化回调接口
                _callback = OperationContext.Current.GetCallbackChannel<IDuplexCallback>();

                
// 每一秒调用一次回调接口(即调用客户端的方法)
                System.Timers.Timer timer = new System.Timers.Timer();
                timer.Interval 
= 3000d;
                timer.Elapsed 
+= delegate { _callback.HelloDuplexCallback("服务端发给客户端的信息:" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")); };
                timer.Start();
            }
        }
    }
}


App.config

代码
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    
<system.serviceModel>
        
<services>
            
<!--
                元数据地址:http://localhost:12345/SocketServer/Duplex/mex
                TCP 地址:net.tcp://localhost:4502/SocketServer/Duplex
                TCP 端口限制在 4502 - 4534 之间
            
-->
            
<service name="SocketServer.Duplex">
                
<endpoint address="SocketServer/Duplex" binding="customBinding" contract="SocketServer.IDuplex" />
                
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
                
<host>
                    
<baseAddresses>
                        
<add baseAddress="http://localhost:12345/SocketServer/Duplex" />
                        
<add baseAddress="net.tcp://localhost:4502/" />
                    
</baseAddresses>
                
</host>
            
</service>
        
</services>
        
        
<!--
            Silverlight 4.0 对 NetTcpBinding 的支持是通过自定义绑定的方式来实现的。服务端和客户端都需要使用自定义绑定
        
-->
        
<bindings>
            
<customBinding>
                
<binding>
                    
<binaryMessageEncoding></binaryMessageEncoding>
                    
<tcpTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" />
                
</binding>
            
</customBinding>
        
</bindings>
        
        
<behaviors>
            
<serviceBehaviors>
                
<behavior>
                    
<serviceMetadata httpGetEnabled="true" />
                    
<serviceDebug includeExceptionDetailInFaults="true"/>
                
</behavior>
            
</serviceBehaviors>
        
</behaviors>
    
</system.serviceModel>
</configuration>


Form1.cs

代码
// 启动 WCF 服务,用于演示 Silverlight 4.0 与 WCF 的交互(基于 NetTcpBinding 绑定)
private void LaunchNetTcpBinding()
{
    ServiceHost host 
= new ServiceHost(typeof(SocketServer.Duplex));
    host.Open();

    ShowMessage(
"演示 NetTcpBinding 的 WCF 服务已启动");
}


客户端(需要引用服务的元数据):
NetTcpBinding.xaml

代码
<navigation:Page x:Class="Silverlight40.Communication.NetTcpBinding" 
           xmlns
="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x
="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:d
="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc
="http://schemas.openxmlformats.org/markup-compatibility/2006"
           xmlns:navigation
="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           Title
="NetTcpBinding Page">
    
<Grid x:Name="LayoutRoot">
        
<StackPanel HorizontalAlignment="Left">

            
<Button Name="btnSend" Content="发送信息到服务端" Click="btnSend_Click" />
            
            
<TextBlock Name="lblMsg" />
            
        
</StackPanel>
    
</Grid>
</navigation:Page>


NetTcpBinding.xaml.cs

代码
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.Windows.Navigation;

using System.ServiceModel;
using System.Net.Sockets;
using System.ServiceModel.Channels;

namespace Silverlight40.Communication
{
    
public partial class NetTcpBinding : Page, DuplexServiceReference.IDuplexCallback
    {
        
private DuplexServiceReference.DuplexClient _client;

        
public NetTcpBinding()
        {
            InitializeComponent();
        }

        
protected override void OnNavigatedTo(NavigationEventArgs e)
        {
           
        }


        
private void btnSend_Click(object sender, RoutedEventArgs e)
        {
            
// 客户端与服务端之间如果没有信道的话,则产生这个信道
            if (_client == null)
            {
                var ctx 
= new InstanceContext(this);
                
                
// 通过配置文件的方式建立信道
                _client = new DuplexServiceReference.DuplexClient(ctx);

                
// 通过编写代码的方式建立信道
                /*
                EndpointAddress ea = new EndpointAddress("net.tcp://localhost:4502/SocketServer/Duplex");
                BindingElement be = new TcpTransportBindingElement();
                CustomBinding cb = new CustomBinding(be);
                _client = new DuplexServiceReference.DuplexClient(ctx, cb, ea);
                
*/
            }

            
// 调用服务端的方法
            _client.HelloDuplexAsync("客户端发给服务端的信息:" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"));
            
// _client.HelloDuplexCompleted - 在此 Handler 中获取服务端方法的返回值,因为本例是 IsOneWay 方式,所以没有返回值
        }

        
// 客户端方法,其用于被服务端调用
        public void HelloDuplexCallback(string msg)
        {
            lblMsg.Text 
+= msg + "\n";
        }
    }
}


ServiceReferences.ClientConfig

代码
<configuration>
    
<system.serviceModel>
        
<!--
            使用 NetTcpBinding 绑定需要先引用 System.ServiceModel.NetTcp.dll 程序集
        
-->
        
<client>
            
<endpoint address="net.tcp://localhost:4502/SocketServer/Duplex" binding="customBinding" contract="DuplexServiceReference.IDuplex"
                      bindingConfiguration
="netTcpBinding" />
        
</client>

        
<!--
            Silverlight 4.0 对 NetTcpBinding 的支持是通过自定义绑定的方式来实现的。服务端和客户端都需要使用自定义绑定
        
-->
        
<bindings>
            
<customBinding>
                
<binding name="netTcpBinding">
                    
<binaryMessageEncoding />
                    
<tcpTransport maxReceivedMessageSize="2147483647" maxBufferSize="2147483647" />
                
</binding>
            
</customBinding>
        
</bindings>
    
</system.serviceModel>
</configuration>



2、通过 HTTP 的方式检索 Socket 通信的安全策略
SocketClientRetrievePolicyFileViaHttp.xaml

代码
<navigation:Page x:Class="Silverlight40.Communication.SocketClientRetrievePolicyFileViaHttp" 
           xmlns
="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x
="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:d
="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc
="http://schemas.openxmlformats.org/markup-compatibility/2006"
           xmlns:navigation
="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           Title
="SocketCommunicationRetrievePolicyFileViaHttp Page">
    
<Grid x:Name="LayoutRoot">

        
<TextBlock>
            
<Run>以前的 Socket 通信,在连接之前先要以 943 端口的 TCP 方式在服务端检索策略文件</Run>
            
<LineBreak />
            
<Run>Silverlight 4.0 中的 Socket 通信可以通过 80 端口的 HTTP 方式检索策略文件,获取到的策略文件作用于此 HTTP 地址所解析出的 IP</Run>
            
<LineBreak />
            
<Run>System.Net.Sockets.SocketAsyncEventArgs.SocketClientAccessPolicyProtocol - 指定 Socket 通信检索策略文件的方式 [System.Net.Sockets.SocketClientAccessPolicyProtocol 枚举]</Run>
            
<LineBreak />
            
<Run>可能的值有:System.Net.Sockets.SocketClientAccessPolicyProtocol.Http 和 System.Net.Sockets.SocketClientAccessPolicyProtocol.Tcp</Run>
        
</TextBlock>
        
    
</Grid>
</navigation:Page>



3、两种 HTTP 请求方式,即 ClientHttp 和 BrowserHttp 的区别
服务端:
HttpResult.aspx.cs

代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Silverlight40.Web
{
    
public partial class HttpResult : System.Web.UI.Page
    {
        
protected void Page_Load(object sender, EventArgs e)
        {
            
// 返回当前 HTTP 请求的 HTTP 方法及 Cookie
            Response.Write(string.Format("HttpMethod: {0}, Cookie - name: {1}", Request.HttpMethod, Request.Cookies["name"].Value));
            Response.End();
        }
    }
}


客户端:
ClientHttpAndBrowserHttp.xaml.cs

代码
/*
 * BrowserHttp - 由浏览器构造 HTTP 请求。默认值
 * ClientHttp - 由 Silverlight 客户端构造 HTTP 请求
 * 
 * 指定 HTTP 请求为 BrowserHttp 类型或 ClientHttp 类型的方法如下:
 *     WebRequest.RegisterPrefix("http://", WebRequestCreator.ClientHttp); - 根据前缀指定 HTTP 请求的方式
 *     (HttpWebRequest)WebRequestCreator.ClientHttp.Create(); - 为单个请求指定 HTTP 请求的方式
 * 
 * 本例演示如果通过 ClientHttp,来实现 PUT 方法的 HTTP 请求以及如何手动构造 Cookie(这些在 BrowserHttp 方式下是无法实现的)
 * 详细的 BrowserHttp 和 ClientHttp 的区别参看文档
 
*/

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.Windows.Navigation;

using System.Net.Browser;
using System.IO;
using System.Threading;

namespace Silverlight40.Communication
{
    
public partial class ClientHttpAndBrowserHttp : Page
    {
        SynchronizationContext _syncContext;

        
public ClientHttpAndBrowserHttp()
        {
            InitializeComponent();
        }

        
protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            _syncContext 
= SynchronizationContext.Current;

            
// 创建一个 ClientHttp 方式的 HttpWebRequest 对象
            HttpWebRequest request = (HttpWebRequest)WebRequestCreator.ClientHttp.Create(new Uri("http://localhost:9483/HttpResult.aspx"));

            
// ClientHttp 可以使用任何 Http 方法(BrowserHttp 只能使用 GET 和 POST)
            request.Method = "PUT";

            
// ClientHttp 可以手工构造 Cookie(如果需要 Forms 验证或 NTLM 验证则只能通过 BroswerHttp 方式)
            request.CookieContainer = new CookieContainer();
            request.CookieContainer.Add(
new Uri("http://localhost:9483"), new Cookie("name""webabcd"));

            request.BeginGetResponse(
new AsyncCallback(ResponseCallback), request);

        }

        
// 获取服务返回的结果
        private void ResponseCallback(IAsyncResult result)
        {
            HttpWebRequest request 
= result.AsyncState as HttpWebRequest;
            WebResponse response 
= request.EndGetResponse(result) as HttpWebResponse;

            
if (response != null)
            {
                Stream responseStream 
= response.GetResponseStream();
                
using (StreamReader sr = new StreamReader(responseStream))
                {
                    
string s = sr.ReadToEnd();
                    Deployment.Current.Dispatcher.BeginInvoke(
delegate { MessageBox.Show(s); });
                }
            }
        }
    }
}



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