static void Main(string[] args)
        {
            Console.WriteLine(DateTime.Now.ToString());
            SetTimeOut(2000, alert, "你好");
            Thread.Sleep(20000);
            Console.Read();
        }

        /// <summary>
        /// 延迟处理
        /// </summary>
        /// <param name="interval">延时时间：毫秒</param>
        /// <param name="action">调用方法</param>
        /// <param name="hello">方法入参</param>
        static void SetTimeOut(double interval,Action<string> action,string hello) {
            System.Timers.Timer timer = new System.Timers.Timer();
            timer.AutoReset = false;//是否只触发一次
            timer.Interval = interval;//时间间隔
            //绑定匿名方法
            timer.Elapsed += delegate (object sender, System.Timers.ElapsedEventArgs e)
            {
                timer.Enabled = false;//停用触发
                action(hello);
            };
            timer.Enabled = true;//启用触发
        }
        static void alert(string s)
        {
            Console.WriteLine($"{DateTime.Now.ToString()}--{s}");
        }