C#中定时任务被阻塞问题的解决方法

  protected internal void PollClient()
  {
      int i=0;
      Timer t = new Timer(p => {
          i++;
          if (deviceContextList.Count > 0)
          {
              var deviceContext=GetDeviceContext("123456789");
                  SendMessage(messageList[i%7],deviceContext.tcpSession.writerContext);
              logger.Info("客户端数量："+ deviceContextList.Count);        
          }
          else 
          {
              logger.Info("客户端数量为0");
              Console.WriteLine("客户端数量为0");
          }              
      }, null, 0, 1000) ;           
  }

Timer(TimerCallback callback, object state, int dueTime, int period)

static int i=0;
static Timer _timer = null;
        protected  void PollClient()
        {
             _timer = new Timer(TimerCallback, null, 1000, Timeout.Infinite) ;           
        }
    private void TimerCallback(object state)
    {
            try
            {
                i++;
              
                if (deviceContextList.Count > 0)
                {
                    var deviceContext = GetDeviceContext("123456789");
                    SendMessage(messageList[i % 7], deviceContext.tcpSession.writerContext);
                    logger.Info("客户端数量：" + deviceContextList.Count + "循环次数：" + i);

                }
                else
                {
                    logger.Info("客户端数量为0" + "循环次数：" + i);
                    Console.WriteLine("客户端数量为0" + "循环次数：" + i);
                }
            }
            catch (Exception e)
            {
                logger.Error("定时测试下发报文异常：" + e);
            }
            finally
            {
                _timer.Change( 1000, Timeout.Infinite);
            }
        }