public delegate void 事件名称EventHandler(object serder, Eventargs e);

namespace 自定义事件
{
    //自定义事件分为以下几步:
    class PRogram
    {
        static void Main(string[] args)
        {
            //第六步：主函数调用
            Dog dog = new Dog();
            Host host = new Host(dog);
            DateTime now = new DateTime(2013,8,31,22,39,50);
            DateTime nigth = new DateTime(2013,8,31,22,40,0);
            Console.WrITeLine("~~~~~~~~~时间开始走啊走啊~~~~~~~~~");
            while(now <nigth){
                Console.WriteLine("当前时间:"+now);
                System.Threading.Thread.Sleep(1000);
                now = now.AddSeconds(1);
            }
            Console.WriteLine("~~~~~~~我是小偷，我来了~~~~~~~~~~~~");
            dog.OnAlarn();
        }
    }
    class Dog {
        //第一步：声明关于事件的委托
        public delegate void AlarnEven(object sender,EventArgs e);
        //第二步:声明事件
        public event AlarnEven Alarn;
        //第三步：编写引发事件的函数
        public void OnAlarn() {
            if(this.Alarn!=null){
                Console.WriteLine("n狗报警：有小偷进来了.汪汪汪~~~~~~~~~");
                this.Alarn(this,new EventArgs());
            }
        }
    }
    class Host {
        //第四：编写事件的处理程序
        void HostAlarn(object sender, EventArgs e)
        { Console.WriteLine("主人：抓住小偷啦..!"); }
        //第五步：注册事件的处理程序
        public Host(Dog dog) {
            dog.Alarn += new Dog.AlarnEven(HostAlarn);
        }
    }
}