就第一篇笔记的具体实现：
using System;
namespace CarEvent
{
public class Car
{
// 申明委托
public delegate void CarEngineHandler(string msg);
// 创建委托实例Exploded和AboutToBlow事件
public event CarEngineHandler Exploded;
public event CarEngineHandler AboutToBlow;
//设置属性
public int CurrentSpeed { get; set; }
public int MaxSpeed { get; set; }
public string PetName { get; set; }
public bool CarIsDead;//用于判断是否超速
public Car()//构造函数
{
MaxSpeed = 100;
}
public Car(string name, int maxSp, int currSp)//构造函数重载
{
CurrentSpeed = currSp;
MaxSpeed = maxSp;
PetName = name;
}
public void Accelerate(int delta)//用于触发Exploded和AboutToBlow事件
{
CurrentSpeed += delta;//"踩油门"加速
if (CurrentSpeed >= MaxSpeed)//判断时速
CarIsDead = true;
else
CarIsDead = false;
if (CarIsDead)// 如果Car超速了，触发Exploded事件
{
if (Exploded != null)//判断是否被委托联系起来
{
Exploded("sorry,this car is dead");//调用CarDead事件
}
}
else
{ //如果没有超速，则提示快要超速并显示实时车速
if ((MaxSpeed - CurrentSpeed) > 0 && (MaxSpeed - CurrentSpeed) <= 10 && AboutToBlow != null)//判断是否被委托联系起来且速度是否接近临界值
{
AboutToBlow("careful buddy ! gonna blow !");//调用NearDead事件
Console.WriteLine("CurrentSpeed={0}",CurrentSpeed);//显示实时车速
}
}
}
}
//订阅类书写举例
public class Answer
{
public void CarDead(string msg)//汽车已爆缸事件
{
Console.WriteLine("sorry,this car is dead");
}
public void NearDead(string msg)//汽车快要爆缸事件
{
Console.WriteLine("careful buddy ! gonna blow !");
}
}
//主函数书写
public class test
{
static void Main(string[] args)
{
Car c = new Car("奔驰",100,93);//创建实例并初始化，初始速度为93
Answer an = new Answer();
c.Exploded += new Car.CarEngineHandler(an.CarDead);//Exploded"绑定"CarDead
c.AboutToBlow += new Car.CarEngineHandler(an.NearDead);//AboutToBlow"绑定"NearDead
c.Accelerate(6);//第一次加速，时速小于100，引发的事件为"快要爆缸"并显示实时车速为99
Console.ReadLine();//等待回车键已启动第二次加速
c.Accelerate(2);//第二次加速，时速超过100，引发的事件为"已爆缸"，不显示车速
Console.ReadKey();
}
}
}
结果为：
"careful buddy ! gonna blow !"
"CurrentSpeed=99"
（空行）（一定要记得敲一下回车键，不然不会显示下面字符串）
"sorry,this car is dead"crqq123 crqq123
ays***[email protected]
8年前 (2018-04-12)