看懂 ，学会 .NET 事件的正确姿势-简单版

      发现之前写了一篇关于事件的阐述写的过于抽象。现在想想先理解本质由简入难比较合适
  之前的一篇博客地址：https://www.cnblogs.com/limin/p/7212217.html

 参照网上例子给个简单版本的如下：猫叫->老鼠跑了->主人醒了

 

using system;

namespace eventtest
{
    public class eventdemo
    {
        public void eventtest()
        {
            cat cat = new cat();
            mouse ms = new mouse();
            master mas = new master();
            cat.calling += ms.escape;//老鼠对 clling 订阅
            cat.calling += mas.wakened;//人 对 calling 订阅
            cat.call(); //猫叫
        }
    }
    public sealed class cat
    {
        public event eventhandler calling;
        public void call()
        {
            console.writeline("猫叫了...");
            calling?.invoke(this, eventargs.empty);
        }
    }
    public sealed class mouse : eventargs
    {
        public void escape(object sender, eventargs e)
        {
            console.writeline("老鼠逃跑了...");
        }
    }
    public sealed class master
    {
        public void wakened(object sender, eventargs e)
        {
            console.writeline("主人醒了");
        }
    }
}