导出 (0) 打印
全部展开

HttpWebRequest.EndGetRequestStream 方法

结束对用于写入数据的 Stream 对象的异步请求。

命名空间:System.Net
程序集:System(在 system.dll 中)

public override Stream EndGetRequestStream (
	IAsyncResult asyncResult
)
public Stream EndGetRequestStream (
	IAsyncResult asyncResult
)
public override function EndGetRequestStream (
	asyncResult : IAsyncResult
) : Stream

参数

asyncResult

流的待定的请求。

返回值

用来写入请求数据的 Stream

异常类型条件

ArgumentNullException

asyncResult 为 空引用(在 Visual Basic 中为 Nothing)。

IOException

请求未完成,没有可用的流。

ArgumentException

当前实例没有从 BeginGetRequestStream 调用返回 asyncResult

InvalidOperationException

以前使用 asyncResult 调用过此方法。

WebException

Abort 以前被调用过。

- 或 -

处理请求时发生错误。

EndGetRequestStream 方法完成对由 BeginGetRequestStream 方法开始的流的异步请求。返回 Stream 对象后,可以通过使用 Stream.Write 方法发送带有 HttpWebRequest 的数据。

Note注意

必须先设置 ContentLength 属性的值,然后才能将数据写入到该流。

Caution note警告

必须调用 Stream.Close 方法关闭该流并释放连接以便重新使用。关闭该流失败将导致应用程序用尽连接。

Note注意

当在应用程序中启用网络跟踪功能后,此成员将输出跟踪信息。有关更多信息,请参见 网络跟踪

下面的代码示例使用 EndGetRequestStream 方法来结束对流实例的异步请求。

using System;
using System.Net;
using System.IO;
using System.Text;
using System.Threading;

class HttpWebRequestBeginGetRequest
{
    public static ManualResetEvent allDone = new ManualResetEvent(false);
    public static void Main()
    {
        

            // Create a new HttpWebRequest object.
            HttpWebRequest request=(HttpWebRequest) WebRequest.Create("http://www.contoso.com/example.aspx");    
    
            // Set the ContentType property. 
            request.ContentType="application/x-www-form-urlencoded";
            // Set the Method property to 'POST' to post data to the URI.
            request.Method = "POST";
            // Start the asynchronous operation.    
            request.BeginGetRequestStream(new AsyncCallback(ReadCallback), request);    
            
            // Keep the main thread from continuing while the asynchronous
            // operation completes. A real world application
            // could do something useful such as updating its user interface. 
            allDone.WaitOne();

            // Get the response.
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream streamResponse = response.GetResponseStream();
            StreamReader streamRead = new StreamReader(streamResponse);
            string responseString = streamRead.ReadToEnd();
            Console.WriteLine(responseString);
            // Close the stream object.
            streamResponse.Close();
            streamRead.Close();
    
            // Release the HttpWebResponse.
            response.Close();
        }
    
    private static void ReadCallback(IAsyncResult asynchronousResult)
    {    
            HttpWebRequest request = (HttpWebRequest)asynchronousResult.AsyncState;
            // End the operation.
            Stream postStream = request.EndGetRequestStream(asynchronousResult);
            Console.WriteLine("Please enter the input data to be posted:");
            string postData = Console.ReadLine ();
            
            // Convert the string into a byte array.
            byte[] byteArray = Encoding.UTF8.GetBytes(postData);
            // Write to the request stream.
            postStream.Write(byteArray, 0, postData.Length);
            postStream.Close ();
            allDone.Set();    
    }

}

import System.*;
import System.Net.*;
import System.IO.*;
import System.Text.*;
import System.Threading.*;

class HttpWebRequestBeginGetRequest
{
    public static ManualResetEvent allDone = new ManualResetEvent(false);

    public static void main(String[] args)
    {
        // Create a new HttpWebRequest object.
        HttpWebRequest request = (HttpWebRequest)(WebRequest.Create(
            "http://www.contoso.com/example.aspx"));
        // Set the ContentType property. 
        request.set_ContentType("application/x-www-form-urlencoded");
        // Set the Method property to 'POST' to post data to the URI.
        request.set_Method("POST");
        // Start the asynchronous operation.    
        request.BeginGetRequestStream(new AsyncCallback(ReadCallback), request);
        // Keep the main thread from continuing while the asynchronous
        // operation completes. A real world application
        // could do something useful such as updating its user interface. 
        allDone.WaitOne();

        // Get the response.
        HttpWebResponse response = (HttpWebResponse)(request.GetResponse());
        Stream streamResponse = response.GetResponseStream();
        StreamReader streamRead = new StreamReader(streamResponse);
        String responseString = streamRead.ReadToEnd();
        Console.WriteLine(responseString);

        // Close the stream object.
        streamResponse.Close();
        streamRead.Close();
        // Release the HttpWebResponse.
        response.Close();
    } //main

    private static void ReadCallback(IAsyncResult asynchronousResult)
    {
        HttpWebRequest request = (HttpWebRequest)
            (asynchronousResult.get_AsyncState());
        // End the operation.
        Stream postStream = request.EndGetRequestStream(asynchronousResult);
        Console.WriteLine("Please enter the input data to be posted:");
        String postData = Console.ReadLine();
        // Convert the string into a byte array.
        ubyte byteArray[] = Encoding.get_UTF8().GetBytes(postData);
        // Write to the request stream.
        postStream.Write(byteArray, 0, postData.get_Length());
        postStream.Close();
        allDone.Set();
    } //ReadCallback
} //HttpWebRequestBeginGetRequest 

Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition

.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表,请参见系统要求

.NET Framework

受以下版本支持:2.0、1.1、1.0

.NET Compact Framework

受以下版本支持:2.0、1.0

社区附加资源

添加
Microsoft 正在进行一项网上调查,以了解您对 MSDN 网站的意见。 如果您选择参加,我们将会在您离开 MSDN 网站时向您显示该网上调查。

是否要参加?
显示:
© 2014 Microsoft