//委托是类型,事件是对象;
using System;
using System.Collections.Generic;
using System.Text;
namespace Delegate {
// 热水器
public class Heater {
private int temperature;
public delegate void BoilHandler(int param); //声明委托
public event BoilHandler BoilEvent; //声明事件
// 烧水
public void BoilWater() {
for (int i = 0; i <= 100; i++) {
temperature = i;
if (temperature > 95) {
if (BoilEvent != null) { //如果有对象注册
BoilEvent(temperature); //调用所有注册对象的方法
}
}
}
}
}
// 警报器
public class Alarm {
public void MakeAlert(int param) {
Console.WriteLine("Alarm:嘀嘀嘀,水已经 {0} 度了:", param);
}
}
// 显示器
public class Display {
public static void ShowMsg(int param) { //静态方法
Console.WriteLine("Display:水快烧开了,当前温度:{0}度。", param);
}
}
class Program {
static void Main() {
Heater heater = new Heater();
Alarm alarm = new Alarm();
heater.BoilEvent += alarm.MakeAlert; //注册方法
heater.BoilEvent += (new Alarm()).MakeAlert; //给匿名对象注册方法
heater.BoilEvent += Display.ShowMsg; //注册静态方法
heater.BoilWater(); //烧水,会自动调用注册过对象的方法
}
}
}
//-------------------------------------------------------输出为:------------------------------------------------------//
Alarm:嘀嘀嘀,水已经 96 度了:
Alarm:嘀嘀嘀,水已经 96 度了:
Display:水快烧开了,当前温度:96度。
//-------------------------------------------------------输出为:------------------------------------------------------//
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