简单多播委托Demo

namespace ConsoleApp4
{
    class Program
    {
        static void Main(string[] args)
        {
            Mum mum = new Mum();
            Dad dad = new Dad();
            Son son = new Son();
            Sister sister = new Sister();
            mum.TellEat();
            mum.EatDel += son.SonEat;
            mum.EatDel += dad.DadEat;
            mum.EatDel += sister.SisterEat;
            mum.EatDel();
            //最后执行这个委托即可
            Console.ReadKey();
        }
    }
    //定义一个无参无返的委托
    public delegate void HaveEatDel();
    public class Mum
    {
        public void TellEat()
        {
            Console.WriteLine("吃饭了");
        }
        //定义委托实例
        public HaveEatDel EatDel { get; set; }
    }
    public class Son
    {
        public void SonEat()
        {
            Console.WriteLine("知道了，玩完游戏再去");
        }
    }
    public class Dad
    {
        public void DadEat()
        {
            Console.WriteLine("就来！");
        }
    }
    public class Sister
    {
        public void SisterEat()
        {
            Console.WriteLine("一会就来");
        }
    }
}