委托和事件C#演示代码

class Cat
{
    private string _name;
    public Cat(string name)
    {
        _name = name;
    }

    public void Shout()
    {
        Console.WriteLine("瞄，我是"+_name+"，我来了！");
        CatShout();        //第三步，触发点，事件要加括号
    }

    public delegate void CatShoutEventHandler();    //第一步，声明委托，要加圆括号

    public event CatShoutEventHandler CatShout;        //第二步，声明事件，类型为以上委托类型
}

class Mouse
{
    public string _name;
    public Mouse(string name)
    {
        _name = name;
    }

    public void Run()
    {
        Console.WriteLine("猫来了，我是"+_name+"，快跑！");
    }
}

static void Main(string[] args)
{
    Cat cat=new Cat("Tom");
    Mouse jerry=new Mouse("Jerry");
    Mouse jack=new Mouse("Jack");

    cat.CatShout += new Cat.CatShoutEventHandler(jerry.Run);    //第四步，将相关方法的委托登记到事件
    cat.CatShout += new Cat.CatShoutEventHandler(jack.Run);

    cat.Shout();
    Console.ReadLine();
}