程序代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Threading;
namespace cs
{
    class Program
    {

        static void Main(string[] args)
        {
            Guo锅 g = new Guo锅();
            g.CCEvent += G_CCEvent;
            g.Play();
            string r = Console.ReadLine();
            if (r == "s")
            {
                g.Stop();
            }
        }

        private static void G_CCEvent(string Msg)
        {
            Console.WriteLine(Msg);
            //throw new NotImplementedException();
        }
    }
    public class Guo锅
    {
        public delegate void CC炒菜EventHandler(string Msg);
        public event CC炒菜EventHandler CCEvent;
        private bool State=false;
        public void Play()
        {
            State = true;
            while (State)
            {
                //触发事件
                if (CCEvent != null)
                {
                    CCEvent("炒菜中……" + DateTime.Now.ToString());
                }
                Thread.Sleep(1000);
            }
        }
        public void Stop()
        {
            State = false;
        }
    }