使用C# HttpWebRequest进行多线程网页提交。Async httpclient/HttpWebRequest实现批量任务的发布及异步提交和超时取消

使用线程池并发处理request请求及错误重试，使用委托处理UI界面输出。

http://www.cnblogs.com/Charltsing/p/httpwebrequest.html

for (int j = 0; j < _userlist.Count; j++)
   {
       user = _userlist[j];
       if (user.Length == 0) continue;
 
       for (int k = 0; k < _passwordlist.Count; k++)
       {
           password = _passwordlist[k];
           if (password.Length == 0) continue;
 
           if (threadscount < _MaxThreadsCount)
           {                                
               if (_isStop) 
               {
                   WriteMessage("\r\n停止创建新线程，正在结束已运行的线程，请等待...\r\n");
                   goto StopHttp;
               }
               HttpWebRequestParameters param = new HttpWebRequestParameters(url, user, password,0,false);
               ThreadPool.QueueUserWorkItem(new WaitCallback(MakeWebRequest), param);
               Interlocked.Increment(ref threadscount);
               Interlocked.Increment(ref requestcount);
           }
           else
           {
               k--;
           }
           WriteStatus("已使用线程数：" + threadscount.ToString() +
                       " 已发送请求数：" + requestcount.ToString() +
                       " 已完成请求数：" + responsecount.ToString());
       }
       System.GC.Collect();
   }