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

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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); });
                }
            }
        }
    }
}


OK
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