using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace Delegate
{//定义了一个从System.Delegate类派生的类//也可以理解为一种数据类型 这种数据类型指向返回值为void 参数为Person对象的函数//我们也可以把Person类理解为一种数据类型 只是它包含的是Name和Agepublic delegate void EatFoodDelegate(Person p);public class Person{public string Name { get; set; }public int Age { get; set; }public Person(string name, int age){Name = name;Age = age;}//既然委托是一数据类型和String一样，所以可以像声明String对象一样声明代理变量public EatFoodDelegate eatFoodDelegate;////之前是直接声明委托，现在是声明一个事件//public event EatFoodDelegate EatFoodEventHandler;public void eating(){if (eatFoodDelegate != null){eatFoodDelegate(this);}}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace Delegate
{class Program{static void Main(string[] args){Person chinesePerson = new Person("小明",25);//通过构造函数实例化对象chinesePerson.eatFoodDelegate += new EatFoodDelegate(chineseEat);chinesePerson.eating();Console.WriteLine("--------------------------------------");EatFoodDelegate EnglishEatPisaDelegate = delegate (Person p){Console.WriteLine("I'm {0},I am {1} , I eat PiSa", p.Name, p.Age);};Person englishPerson = new Person("Ivan",25);englishPerson.eatFoodDelegate = delegate (Person p){Console.WriteLine("I'm {0},I am {1} , I eat MianBao", p.Name, p.Age);};englishPerson.eatFoodDelegate += EnglishEatPisaDelegate;englishPerson.eating();Console.ReadLine();}static void chineseEat(Person p){Console.WriteLine("我是{0},我今年{1}岁了,我吃馒头",p.Name,p.Age);}}}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace Delegate
{class Program{static void Main(string[] args){Person chinesePerson = new Person("小明",25);//通过构造函数实例化对象chinesePerson.eatFoodDelegate += new EatFoodDelegate(chineseEat);chinesePerson.eating();Console.WriteLine("--------------------------------------");Person englishPerson = new Person("Ivan",25);englishPerson.eatFoodDelegate = (Person p) => {Console.WriteLine("I'm {0},I am {1} , I eat MianBao", p.Name, p.Age);};englishPerson.eatFoodDelegate += (Person p) => {Console.WriteLine("I'm {0},I am {1} , I eat PiSa", p.Name, p.Age);};englishPerson.eating();Console.ReadLine();}static void chineseEat(Person p){Console.WriteLine("我是{0},我今年{1}岁了,我吃馒头",p.Name,p.Age);}}
}