定义猫类
class Cat { private string name; private string color; public Cat(string name,string color) { this.name=name; this.color=color; } public void CatComing() { Console.WriteLine(color + "的猫" + name + "来了"); if(catCome!=null) { catCome(); } } public event Action catCome;//声明一个事件，发布了一个消息 }定义鼠类
class Mouse { private string name; private string color; public Mouse(string name, string color,Cat cat) { this.name = name; this.color = color; cat.catCome += this.RunAway; } public void RunAway() { Console.WriteLine(color + "的老鼠" + name + "说：快跑啊，猫来了"); } } class Program { static void Main(string[] args) { Cat cat = new Cat("加菲猫", "黄色"); Mouse m1 = new Mouse("米老鼠", "黑色",cat); Mouse m2 = new Mouse("仓鼠", "灰色",cat); cat.CatComing(); // cat.catCome();//声明为事件后，不能在外部触发，只能在能不调用 Console.ReadKey(); } }