一个多线程协助工作

  public class Worker
    {
        // This method will be called when the thread is started.
        public void DoWork()
        {  
            Console.WriteLine("主线程成功启动!");
            while (!_shouldStop)
            {
               
                Console.WriteLine( DateTime.Now.ToString("yyyyMMddHHmmss")+":主进程正在工作!" );
                guard.guardId = true;
                GetNewEmails();
                System.Threading.Thread.Sleep(1000 * refreshinterval);

            }
            Console.WriteLine("主线程关闭!");
        }
        public void RequestStop()
        {
            _shouldStop = true;
        }
        public void RequestOpen()
        {
            _shouldStop = false;
        }
        public bool shouldStop
        {
            get { return _shouldStop; }
            set { _shouldStop = value; }
        }
    
        private bool _shouldStop = false;
}

  class guard
    {

       static  public bool guardId = false;
       static public int guardinterval = Convert.ToInt32(ConfigurationManager.AppSettings["guardinterval"]);
       static  public void guardThread()
        {
            while (true)
            {
                System.Threading.Thread.Sleep(1000 * guardinterval);
               
                if (!guardId)
                {
                    Console.WriteLine("主线程异常!");

                    try
                    {
                       // Program.workerThread.Abort();
                        Program.workerObject.RequestStop();
                        Program.workerThread.Join();
                        Thread.Sleep(6000);
                        Program.workerThread = null;
                        Console.WriteLine("主线程赋值为空!");
                        Program.workerThread = new Thread(Program.workerObject.DoWork);
                        Console.WriteLine("主线程重新创建!");
                        Program.workerThread.Start();
                        Program.workerObject.RequestOpen();
                       
                    }
                    catch (Exception e)
                    {
                        Console.WriteLine("守护进程:" + e.Message);
                    }
               
                    
                }
                else
                {
                    Console.WriteLine("主线程正常!");
                }

                guardId = false;
            }

        }
    }

    static class Program
    {  

      
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        static public  Worker workerObject = new Worker();
        static public  guard guardobject = new guard();
        static public  Thread workerThread = null;
        static public  Thread  guardThread=null;
        static void Main()
        {
           workerThread = new Thread(workerObject.DoWork);
           guardThread = new Thread(guard.guardThread);
           workerThread.Start();
           guardThread.Start();
        }
    
    }