System.OutOfMemoryException' was thrown - WebClient.Down

我正在编写一个穷人负载测试器，我认为我正在正确地管理我的资源(线程池)，但当我运行以下代码时，我在调用WebClient.DownloadStringAsynch时得到OutOfMemoryException。

使用。net4.0，但可以移动到4.5.

问道:

• 怎么解决?
• 我怎么能使用HttpWebRequest和发送异步作为web客户端的替代方案?

• 使用。net 4.5使用await(与。net4如何管理带有异步调用的线程有什么不同?)

  static void Main(string[] args)
  {
      System.Net.ServicePointManager.DefaultConnectionLimit = 200;
      while (true)
      {
          for (int i = 0; i < 100; i++)
          {
              Task.Factory.StartNew(LoadTestAsynchNET40);
          }
          Console.WriteLine(".........................sleeping...............................");
          Thread.Sleep(2);
      }
  }
  static void LoadTestAsynchNET40()
  {
    string url = "http://mysrv.com/api/dev/getthis?stuff=thestuff" + "&_=" + DateTime.Now.Ticks;  // <--- somtimes throws here...
      using (var client = new WebClient())
      {
          DateTime dt1 = DateTime.Now;
          client.Headers["Accept"] = "text/xml";
          client.DownloadStringCompleted += DownloadStringCompleted;
          Console.WriteLine(DateTime.Now.ToString("ss:fff") + ", Sent Ad Request...");
          client.DownloadStringAsync(new Uri(url), dt1); //<---throws here...
      }
  }
  static void DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
  {
      Console.WriteLine("Received reponse...");
  }