C#委托、事件学习之（一）——委托事件描述

1、委托是一个类，定义了方法的类型，使得该方法可以作为其他方法的参数。避免了if...else的大量使用。

using System;

namespace ConsoleApplication1
{
    public class GreetPeople
    {
        public delegate void GreetEventHander(object sender, GreetEventArgs e);
        public event GreetEventHander Greet;
        public class GreetEventArgs : EventArgs
        {
            public readonly string name;
            public GreetEventArgs(string Tem)
            {
                this.name = Tem;
            }
        }
        protected virtual void GreetWay(GreetEventArgs e)
        {
            if (Greet != null)
                Greet(this, e);//调用注册方法
        }
        public void Greeting(string name)
        {
            GreetEventArgs e = new GreetEventArgs(name);
            GreetWay(e);
        }
    }
    public class GreetWays
    {
        public void English(object sender, GreetPeople.GreetEventArgs e)
        {