猫与老鼠的故事（委托）

public delegate void catMiaoHanler(Cat cat);
    public class Cat
    {
        public catMiaoHanler thisHanler;
        public string Name { get; set; }

        public Cat() { }

        public void Miao()
        {
            Console.WriteLine("miao miao miao ");
            thisHanler(this);
        }
    }
    class Mouse
    {

        public string Name { get; set; }
        public int Level { get; set; }
        public Mouse(Cat listenCat)
        {
            listenCat.thisHanler += (cat) =>
            {
                if (Level > 10) Console.WriteLine(cat.Name + "is coming!!!" + this.Name + " go go go ");
                else
                    Console.WriteLine(cat.Name + "is coming!!!" + this.Name + " is dead!");
            };
        }
    }

    class Program
    {

        static void Main(string[] args)
        {
            //Cat cat = new Cat(new List<Mouse> { new Mouse { Name = "tom", Level = 1 }, new Mouse { Name = "jack", Level = 2 } });
            Cat cat = new Cat { Name = "Tim" };
            Mouse m1 = new Mouse(cat) { Name = "tom", Level = 9 };
            Mouse m2 = new Mouse(cat) { Name = "tom2", Level = 19 };
            cat.Miao();
            Console.ReadLine();
        }
    }

　　

miao miao miao
Timis coming!!!tom is dead!
Timis coming!!!tom2 go go go