我要评论本文实例讲述了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。
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