稳扎稳打Silverlight(21) - 2.0通信之WebRequest和WebResponse, 对指定的URI发出请求以及接收响应

概述[索引页] [源码下载] 稳扎稳打Silverlight(21) - 2.0通信之WebRequest和WebResponse, 对指定的URI发出请求以及接收响应 作者：webabcd 介绍 Silverlight 2.0 详解WebRequest和WebResponse，对指定的URI做GET和POST请求，以及接收其响应     HttpWebRequest - 对指定的 URI 发出请求 [索引页]
[源码下载]


稳扎稳打Silverlight(21) - 2.0通信之WebRequest和WebResponse,对指定的URI发出请求以及接收响应

作者：webabcd


介绍
Silverlight 2.0 详解WebRequest和WebResponse，对指定的URI做GET和POST请求，以及接收其响应
    httpWebRequest - 对指定的 URI 发出请求
        Create() - 初始化一个 WebRequest
        BeginGetResponse() - 开始对指定 URI 资源做异步请求
        EndGetResponse() - 结束对指定 URI 资源做异步请求
    httpWebResponse - 对指定的 URI 做出响应
        GetResponseStream() - 获取响应的数据流


在线DEMO
http://www.voidcn.com/article/p-ounmxjds-tq.html

示例
1、对指定的URI做GET请求以及接收响应
WebRequestGet.xaml <UserControl x:Class="Silverlight20.Communication.WebRequestGet"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
        <StackPanel HorizontalAlignment="left" margin="5">
        
                <TextBlock x:name="lblMsg" />
                
        </StackPanel>
</UserControl>   WebRequestGet.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.Threading;

using System.IO;

namespace Silverlight20.Communication

{

         public partial class WebRequestGet : UserControl

        {

                 // 接收 GET 方式数据的 REST 服务

                 string _url = "http://localhost:3036/REST.svc/Users/Json";

                // 异常信息

                string _exception = "";

                

                // SynchronizationContext - 同步上下文管理类

                SynchronizationContext _syncContext;

                public WebRequestGet()

                {

                        InitializeComponent();

                        Demo();

                }

                voID Demo()

                {

                        // SynchronizationContext.Current - 当前线程的同步上下文

                        _syncContext = SynchronizationContext.Current;

                        /*

                         * httpWebRequest - 对指定的 URI 发出请求

                         *         httpWebRequest.Create(uri) - 初始化一个 WebRequest

                         *         httpWebRequest.BeginGetResponse(AsyncCallback callback,Object state) - 开始对指定 URI 资源做异步请求

                         *                 AsyncCallback callback - System.AsyncCallback 委托。异步 *** 作完成时调用的回调方法

                         *                 Object state - 包含此异步请求的对象。即相应的 httpWebRequest 对象

                         *         httpWebRequest.Abort() - 取消该异步请求

                         *         httpWebRequest.Accept - http 头的 Accept    部分

                         *         httpWebRequest.ContentType - http 头的 ContentType 部分

                         *         httpWebRequest.headers - http 头的 key/value 对集合

                         *         httpWebRequest.Method - http 方法（只支持GET和POST）

                         *         httpWebRequest.RequestUri - 所请求的 URI

                         *         httpWebRequest.HaveResponse - 是否接收到了指定 URI 的响应

                         *         httpWebRequest.AllowReadStreamBuffering - 是否对从 Internet 资源接收的数据做缓冲处理。默认值为true，将数据缓存在客户端内存中，以便随时被应用程序读取

                         */

                        httpWebRequest request = WebRequest.Create(

                                new Uri(_url,UriKind.absolute)) as httpWebRequest;

                        request.Method = "GET";

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

                }

                private voID ResponseCallback(IAsyncResult result)

                {

                        // IAsyncResult.AsyncState - AsyncCallback 传过来的对象

                        httpWebRequest request = result.AsyncState as httpWebRequest;

                        WebResponse response = null;

                        try

                        {

                                // httpWebRequest.EndGetResponse(IAsyncResult) - 结束对指定 URI 资源做异步请求

                                //         返回值为 WebResponse 对象

                                response = request.EndGetResponse(result) as httpWebResponse;

                        }

                        catch (Exception ex)

                        {

                                _exception = ex.ToString();

                        }

                        // SynchronizationContext.Post(SendOrPostCallback d,Object state) - 将异步消息发送到该同步上下文中

                        //         SendOrPostCallback d - System.Threading.SendOrPostCallback 委托

                        //         Object state - 需要传递的参数

                        _syncContext.Post(GetResponse,response);

                }

                private voID GetResponse(object state)

                {

                        /*

                         * httpWebResponse - 对指定的 URI 做出响应

                         *         GetResponseStream() - 获取响应的数据流

                         */

                        httpWebResponse response = state as httpWebResponse;

                        if (response != null)

                        {

                                Stream responseStream = response.GetResponseStream();

                                using (StreamReader sr = new StreamReader(responseStream))

                                {

                                        lblMsg.Text = sr.ReadToEnd();

                                }

                        }

                        else

                        {

                                lblMsg.Text = _exception;

                        }

                }

        }

}     2、对指定的URI做POST请求以及接收响应
WebRequestPost.xaml <UserControl x:Class="Silverlight20.Communication.WebRequestPost"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
        <StackPanel HorizontalAlignment="left" margin="5">
        
                <TextBlock x:name="lblMsg" />
        
        </StackPanel>
</UserControl>   WebRequestPost.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.Threading;

using System.IO;

namespace Silverlight20.Communication

{

         public partial class WebRequestPost : UserControl

        {

                 // 接收 POST 方式数据的 REST 服务

                 string _url = "http://localhost:3036/REST.svc/PostUser";

                // 异常信息

                string _exception = "";

                // SynchronizationContext - 同步上下文管理类

                SynchronizationContext _syncContext;

                public WebRequestPost()

                {

                        InitializeComponent();

                        Demo();

                }

                voID Demo()

                {

                        _syncContext = SynchronizationContext.Current;

                        httpWebRequest request = WebRequest.Create(

                                new Uri(_url,UriKind.absolute)) as httpWebRequest;

                        request.Method = "POST";

                        // BeginGetRequestStream(AsyncCallback callback,Object state) - 向指定的 URI 资源发送数据的流的异步请求

                        //         AsyncCallback callback - System.AsyncCallback 委托

                        //         Object state - 包含此异步请求的对象。即相应的 httpWebRequest 对象

                        IAsyncResult asyncResult = request.BeginGetRequestStream(

                                new AsyncCallback(RequestStreamCallback),request);

                }

                private voID RequestStreamCallback(IAsyncResult result)

                {

                        httpWebRequest request = result.AsyncState as httpWebRequest;

                        request.ContentType = "application/x-www-form-urlencoded";

                        // httpWebRequest.EndGetRequestStream(IAsyncResult) - 返回用于将数据写入某 URI 资源的 Stream

                        Stream requestStream = request.EndGetRequestStream(result);

                        StreamWriter streamWriter = new StreamWriter(requestStream);

                        // byte[] postdata = System.Text.EnCoding.UTF8.GetBytes("name=webabcd");

                        // 多个参数用“&”分隔

                        streamWriter.Write("name=webabcd");

                        streamWriter.Close();

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

                }

                private voID ResponseCallback(IAsyncResult result)

                {

                        httpWebRequest request = result.AsyncState as httpWebRequest;

                        WebResponse response = null;

                        try

                        {

                                response = request.EndGetResponse(result);

                        }

                        catch (Exception ex)

                        {

                                _exception = ex.ToString();

                        }

                        // 调用 UI 线程

                        _syncContext.Post(GetResponse,response);

                }

                private voID GetResponse(object state)

                {

                        /*

                         * httpWebResponse - 对指定的 URI 做出响应

                         *         GetResponseStream() - 获取响应的数据流

                         *         ContentLength - 接收的数据的内容长度

                         *         ContentType - http 头的 ContentType 部分

                         *         Method - http 方法

                         *         ResponseUri - 响应该请求的 URI

                         *         StatusCode - 响应状态 [System.Net.httpStatusCode枚举]

                         *                 httpStatusCode.OK - http 状态为 200

                         *                 httpStatusCode.NotFound - http 状态为 404

                         *         StatusDescription - 响应状态的说明

                         */

                        httpWebResponse response = state as httpWebResponse;

                        if (response != null && response.StatusCode == httpStatusCode.OK)

                        {

                                Stream responseStream = response.GetResponseStream();

                                using (StreamReader sr = new StreamReader(responseStream))

                                {

                                        lblMsg.Text = string.Format("接收的数据的内容长度：{0}\r\nhttp 头的 ContentType 部分：{1}\r\nhttp 方法：{2}\r\n响应该请求的 URI：{3}\r\n响应状态：{4}\r\n响应状态的说明：{5}\r\n响应的结果：{6}\r\n",

                                                response.ContentLength,

                                                response.ContentType,

                                                response.Method,

                                                response.ResponseUri,

                                                response.StatusCode,

                                                response.StatusDescription,

                                                sr.ReadToEnd());

                                }

                        }

                        else

                        {

                                lblMsg.Text = _exception;

                        }

                }

        }

}     OK
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