public void Stop()
 {
     _logger.Info("开始停止Exchange服务");
     try
     {
         if (_retryTimer != null)
         {
             _retryTimer.Change(Timeout.Infinite, Timeout.Infinite);
         }
         _pingTimer.Change(Timeout.Infinite, Timeout.Infinite);
         if (_client != null)
         {
             _client.Unsubscribe(ClientId);
             _client.Close();
         }
         _logger.Info("停止Exchange服务 成功");
     }
     catch (Exception ex)
     {
         _logger.Error("停止Exchange服务 失败, 出现异常", ex);
         _client.Abort();
     }
     finally
     {
         _serviceThread.Abort();
         _serviceThread = null;
     }
 }