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silverlight 发布时间：2022-05-04 发布网站：大佬教程 code.js-code.com

大佬教程收集整理的这篇文章主要介绍了稳扎稳打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，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。

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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

[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.cnblogs.com/webabcd/archive/2008/10/09/1307486.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://scheR_318_11845@as.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x ="http://scheR_318_11845@as.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()

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initializeComponent();

Demo();

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}

void Demo()

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

_syncContext = SynchronizationContext.Current;

@H_307_403@/*

* 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。异步操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

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httpWebrequest request = Webrequest.Create(

new Uri(_url, UriKind.AbsolutE)) as httpWebrequest;

request.Method = "GET";

request.beginGetResponse(new AsyncCallBACk(ResponseCallBACk), request);

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}

private void responseCallBACk(IAsyncResult result)

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

httpWebrequest request = result.AsyncState as httpWebrequest;

WebResponse response = null;

try

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// 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;

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}

catch (Exception eX)

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_exception = ex.ToString();

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}

// 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);

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}

private void GetResponse(object statE)

{

@H_307_403@/*

* httpWebResponse - 对指定的 URI 做出响应

* GetResponseStream() - 获取响应的数据流

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httpWebResponse response = state as httpWebResponse;

if (response != null)

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Stream responseStream = response.GetResponseStream();

using (StreamReader sr = new StreamReader(responseStream))

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lblMsg.Text = sr.ReadToEnd();

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}

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}

else

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lblMsg.Text = _exception;

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}

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}

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}

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://scheR_318_11845@as.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x ="http://scheR_318_11845@as.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()

@H_307_403@{

initializeComponent();

Demo();

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}

void Demo()

@H_307_403@{

_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);

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}

private void requestStreamCallBACk(IAsyncResult result)

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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);

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}

private void responseCallBACk(IAsyncResult result)

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httpWebrequest request = result.AsyncState as httpWebrequest;

WebResponse response = null;

try

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response = request.EndGetResponse(result);

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}

catch (Exception eX)

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_exception = ex.ToString();

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}

// 调用 UI 线程

_syncContext.Post(GetResponse, responsE);

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}

private void GetResponse(object statE)

{

@H_307_403@/*

* 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

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httpWebResponse response = state as httpWebResponse;

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

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Stream responseStream = response.GetResponseStream();

using (StreamReader sr = new StreamReader(responseStream))

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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());

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}

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}

else