Web服务线程在启动后立即死亡

Question

我在C＃中开发了一个ASP.NET（.asmx）Web服务。在它返回之前，它启动一个线程（通过线程池和一个简单的线程尝试）来执行Web请求。在创建Web请求之前，我需要大约2秒的延迟。我已经尝试过睡眠，定时器，甚至是数百万的for循环计数。在我的开发服务器上，它始终有效。在客户的服务器上，它的工作时间不到10％。根据我的日志记录，线程在Web请求之前的延迟期间结束。什么可以杀死它？ ASP.NET是否认为它不活跃？

它记录“TesterRequest：在WAIT之前”，然后“线程被中止”（见下面的代码），当然没有别的。

相关代码 - 用于循环版本（放入for循环以便在睡眠和计时器方法无法维持之后进行测试，在完成经过时间之前中止）：

static void ThreadProc(object p_tcti)
{

        // Calls a method inside the tester via HttpWebRequest

            int nSleep = 606111000; // 2000;
            LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest: Before WAIT of " + nSleep.ToString());

            int nDummy = 0;
            for (int n = 0; n < nSleep; n++)
            {
                nDummy = n;
            }

            LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest: After WAIT " + nDummy.ToString() + " creating web request to tester.");
            HttpWebRequest reqWeb = (HttpWebRequest)WebRequest.Create(tcti.m_strURL);
            LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest: Created the web request.");
            reqWeb.Method = "GET";
            //reqWeb.MaximumAutomaticRedirections = 4;
            //reqWeb.MaximumResponseHeadersLength = 4;
            reqWeb.UserAgent = "ABRWebService /1.0";
            // Do it!  This will block for up to 40 seconds
            string strStatus = "";
            reqWeb.Timeout = 40000;
     try
     {
                HttpWebResponse resWeb = (HttpWebResponse)reqWeb.GetResponse();
                //       LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest: Received response from the tester web request. ");
                if (resWeb.StatusCode != HttpStatusCode.OK)
                {
                    strStatus = resWeb.StatusDescription;
                    LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest FAILED" + " " + strStatus);
                }
                resWeb.Close();
            }
            catch (WebException we)
            {
                // Ignore timeouts since we don't give a about the
                // response.
                tcti.m_strResult = we.Message;
                if (we.Status != WebExceptionStatus.Timeout)
                {
                    LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest Web Exception:  " + we.Message + "  Request:  " +
                    tcti.m_strResult + ", URL:  " + tcti.m_strURL);
                    if (!strStatus.Equals(""))
                        LogMessage("Status: " + strStatus);
                    LogMessage("TesterRequest FAILED" + " " + DateTime.Now);
                    // RWC don't throwthrow we;
                }
            }
            catch (Exception ex)
            {
                LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest Exception:  " + ex.Message);
            }

            LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest Succeeded.");

}

public TesterRequest(string p_strURL)
{       {
  try
  {
                TesterCommThreadInfo tcti = new TesterCommThreadInfo();
                tcti.m_strURL = p_strURL;
                   LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest: Begin queueing a thread to trigger program download.");
                   ThreadPool.QueueUserWorkItem(new WaitCallback(ThreadProc), tcti);
               // Service.LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest: Begin - Create and launch a new thread to trigger program download.");
                // 6/4/18 changed to simple thread from thread pool for better reliability.
                //Thread tr = new Thread(() => ThreadProc(tcti));
                //tr.Start();
                //Service.LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest: End - Create and launch a new thread to trigger program download.");
                   LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest: End queued a thread to trigger program download.");
            }
            catch (ThreadAbortException tae)
            {
                Service.LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest Thread Abort Exception Creating and/or launching new thread for program download: " + tae.Message);
            }
            catch (AppDomainUnloadedException aue)
            {
                Service.LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest App Domain Unloaded Exception Creating and/or launching new thread for program download: " + aue.Message);
            }
            catch (Exception ex)
            {
                Service.LogMessage(DateTime.Now.ToString() + " ms: " + DateTime.Now.Millisecond.ToString() + ". " + "TesterRequest Exception Creating and/or launching new thread for program download: " + ex.Message);
            }
        }
    }
}