C#实现异步GET的方法

本文实例讲述了c#实现异步get的方法。分享给大家供大家参考。具体实现方法如下：

using system;
using system.collections.generic;
using system.configuration;
using system.io;
using system.linq;
using system.net;
using system.text;
using system.threading.tasks;
namespace webclientasynproject
{
  public class program
  {
    #region httpwebrequest异步get
    public static void asyncgetwithwebrequest(string url)
    {
      var request = (httpwebrequest) webrequest.create(new uri(url));
      request.begingetresponse(new asynccallback(readcallback), request);
    }
    private static void readcallback(iasyncresult asynchronousresult)
    {
      var request = (httpwebrequest) asynchronousresult.asyncstate;
      var response = (httpwebresponse) request.endgetresponse(asynchronousresult);
      using (var streamreader = new streamreader(response.getresponsestream()))
      {
        var resultstring = streamreader.readtoend();
        console.writeline(resultstring);
      }
    }
    #endregion
    #region webclient异步get
    public static void asyncgetwithwebclient(string url)
    {
      var webclient = new webclient();
      webclient.downloadstringcompleted += new downloadstringcompletedeventhandler(client_downloadstringcompleted);
      webclient.downloadstringasync(new uri(url));
    }
    private static void client_downloadstringcompleted(object sender, downloadstringcompletedeventargs e)
    {
      //console.writeline(e.cancelled);
      console.writeline(e.error != null ? "webclient异步get发生错误！" : e.result);
    }
    #endregion
    #region webclient的openreadasync测试
    public static void testgetwebresponseasync(string url)
    {
      var webclient = new webclient();
      webclient.openreadcompleted += new openreadcompletedeventhandler(webclient_openreadcompleted);
      webclient.openreadasync(new uri(url));
    }
    private static void webclient_openreadcompleted(object sender, openreadcompletedeventargs e)
    {
      if(e.error == null)
      {
        var streamreader = new streamreader(e.result);
        var result = streamreader.readtoend();
        console.writeline(result);
      }
      else
      {
        console.writeline("执行webclient的openreadasync出错：" + e.error);
      }
    }
    #endregion
    public static void main(string[] args)
    {
      asyncgetwithwebrequest("http://baidu.com");
      console.writeline("hello");
      asyncgetwithwebclient("http://baidu.com");
      console.writeline("world");
      testgetwebresponseasync("http://baidu.com");
      console.writeline("jxqlovejava");
      console.read();
    }
  }
}

希望本文所述对大家的c#程序设计有所帮助。