C# delegate event 例子

using UnityEngine;
using System.Collections;
using DelegateEvent;

public class test : MonoBehaviour
{
void OnGUI()
{
if(GUI.Button(new Rect(10, 10, 10, 10), ""))
{
Cat cat = new Cat();
Mouse mouse1 = new Mouse("mouse1", cat); //在对象初始化的时候，已经注册了对猫叫的响应事件
Mouse mouse2 = new Mouse("mouse2", cat);
Master master = new Master(cat);
cat.Cry();
}
}
}

namespace DelegateEvent
{
public delegate void SubEventHandler();
public abstract class Subject
{
public event SubEventHandler SubEvent;
protected void FireAway()   //开火， 抽象类可以有具体方法。
{
if (this.SubEvent != null)
this.SubEvent();
}
}

public class Cat : Subject
{
public void Cry()
{
NGUIDebug.Log("cat cryed.");
this.FireAway();
}
}

public abstract class Observer  //定义一个观察者的抽象类，这样的类有一点就是观察谁，这个谁肯定是一个类，这里指猫
{
public Observer(Subject sub)  //抽象类也可以定义构造函数
{
sub.SubEvent += new SubEventHandler(Respose);   //注册猫叫事件(表达有点含糊)，当此事件触发的时候，老鼠会做出回应
}
public abstract void Respose();
}

//定义一个观察者，老鼠
public class Mouse : Observer
{
private string name;
public Mouse(string name, Subject sub)  //定义构造函数，并初始化父类
: base(sub)
{
this.name = name;
}

public override void Respose()
{
NGUIDebug.Log(name + " attempt to escape!");
// Console.WriteLine(name + " attempt to escape!");
}
}
//定义一个观察者，主人
public class Master : Observer
{
public Master(Subject sub) : base(sub) { }
public override void Respose()
{
NGUIDebug.Log("host waken");
}
}
}