namespace test{    class Publisher//出版社    {        public delegate void PubComputer(string magazineName);//声明事件所需的代理        public delegate void PubLife(string magazineName);        public event PubComputer OnPubComputer;//事件的声明 事件的本质是一个委托链        public event PubLife OnPubLife;        public void issueComputer()//触发事件的方法        {            if (OnPubComputer != null){                Console.WriteLine("发行电脑刊物");                OnPubComputer("编程指南");            }        }        public void issueLife()        {            if (OnPubLife!=null) {                Console.WriteLine("发行生活刊物");                OnPubLife("家具");            }        }    }    class Subsriber//订阅者    {        private string name;        public Subsriber(string name){            this.name = name;        }        public void Receive(string magazineName)//在事件订阅者中定义事件处理程序        {            Console.WriteLine(name + "已经收到" + magazineName);        }    }    class Story    {        static void Main()        {            Publisher pub = new Publisher();            Subsriber zs = new Subsriber("张三");            pub.OnPubComputer += new Publisher.PubComputer(zs.Receive);//向事件发行者订阅一个事件            Subsriber ls = new Subsriber("李四");            pub.OnPubComputer += new Publisher.PubComputer(ls.Receive);            pub.OnPubLife += new Publisher.PubLife(ls.Receive);            pub.issueComputer();//触发事件            pub.issueLife();            Console.WriteLine();            Console.WriteLine("一年后");            pub.OnPubComputer -= new Publisher.PubComputer(ls.Receive);            pub.issueComputer();//触发事件            pub.issueLife();        }    }}