WebRequest多线程 超时问题

using System;using System.Collections;using System.Collections.Generic;using System.Net;using System.Threading;using System.Net.Sockets;using System.Net.NetworkInformation;public class ThreadDemo{    public static void Main()    {        List<Thread> tls = new List<Thread>();        System.Net.ServicePointManager.DefaultConnectionLimit = 20;//最大并发数，.net默认并发只有2个        for (int i = 0; i < 50; i++)        {            tls.Add(new Thread(new ThreadStart(test)));            tls[i].Name = "线程" + (i + 1);            tls[i].Start();        }    }    public static void test()    {        new RequestTest().GetRequest(Thread.CurrentThread.Name, "http://163.com");    }}public class RequestTest{    System.Net.HttpWebRequest httpReq = null;    System.Net.HttpWebResponse httpRes = null;    /// <summary>    /// 通过WebRequest来访问网址，网址必须包含http:或https:          /// </summary>      /// <param name="threadName">当前线程</param>         /// <param name="url">要访问的网址</param>    public void GetRequest(string threadName, string url)    {        if (string.IsNullOrEmpty(url) || url.Length <= 0) return;        DateTime dt = DateTime.Now;        if (!url.Contains("."))        {            return;        }        if (!url.Contains("http://") && !url.Contains("https://"))            url = "http://" + url;        try        {            httpReq = (HttpWebRequest)WebRequest.Create(url);            httpReq.Proxy = null;//不使用代理 .NET4.0中的默认代理是开启的            httpReq.KeepAlive = false;//不建立持久性连接            httpReq.Timeout = 5000;//连接网址的超时时间            httpReq.ReadWriteTimeout = 5000;//读取网址内容的超时时间                           httpRes = (HttpWebResponse)httpReq.GetResponse();            Console.WriteLine(threadName + "  " + url + ":" + httpRes.StatusCode);        }        catch (Exception e)        {            Console.WriteLine(threadName + "  " + url + " Error:" + e.Message);        }        finally        {            if (httpRes != null)            {                httpRes.Close();//关闭连接            }            if (httpReq != null)            {                httpReq.Abort();//中止请求            }            httpReq = null;            httpRes = null;            System.GC.Collect();//强制垃圾回收,并释放资源        }    }}

转自：http://www.cnblogs.com/huangtailang/archive/2013/07/09/3180651.html