1 using System;
2 using System.Collections.Generic;
3 using System.Text;
4
5 namespace Delegate
6 {
7 // 热水器
8 public class Heater
9 {
10 private int temperature;
11 public string type = "RealFire 001"; // 添加型号作为演示
12 public string area = "China Xian"; // 添加产地作为演示
13 public delegate void BoiledEventHandler(Object sender, BoiledEventArgs e); //声明委托
14 public event BoiledEventHandler Boiled; //声明事件
15 public class BoiledEventArgs : EventArgs // 定义BoiledEventArgs类,传递给Observer所感兴趣的信息
16 {
17 public readonly int temperature;
18 public BoiledEventArgs(int temperature)
19 {
20 this.temperature = temperature;
21 }
22 }
23 protected virtual void OnBoiled(BoiledEventArgs e) // 可以供继承自 Heater 的类重写,以便继承类拒绝其他对象对它的监视
24 {
25 if (Boiled != null)
26 {
27 Boiled(this, e); // 如果有对象注册调用所有注册对象的方法
28 }
29 }
30 public void BoilWater() //烧水。
31 {
32 for (int i = 0; i <= 100; i++)
33 {
34 temperature = i;
35 if (temperature > 95)
36 {
37 BoiledEventArgs e = new BoiledEventArgs(temperature); //建立BoiledEventArgs 对象。
38 OnBoiled(e); // 调用 OnBolied方法
39 }
40 }
41 }
42 }
43 // 警报器
44 public class Alarm
45 {
46 public void MakeAlert(Object sender, Heater.BoiledEventArgs e)
47 {
48 Heater heater = (Heater)sender; //这里是不是很熟悉呢?
49 Console.WriteLine("Alarm:{0} - {1}: ", heater.area, heater.type); //访问 sender 中的公共字段
50 Console.WriteLine("Alarm: 嘀嘀嘀,水已经 {0} 度了:", e.temperature);
51 //Console.ReadLine();
52 //Console.ReadKey();
53 // Console.WriteLine();
54 }
55 }
56 // 显示器
57 public class Display
58 {
59 public static void ShowMsg(Object sender, Heater.BoiledEventArgs e)
60 { //静态方法
61 Heater heater = (Heater)sender;
62 Console.WriteLine("Display:{0} - {1}: ", heater.area, heater.type);
63 Console.WriteLine("Display:水快烧开了,当前温度:{0}度。", e.temperature);
64 //Console.ReadLine();
65 Console.ReadKey();
66 Console.WriteLine();
67 }
68 }
69
70 class Program
71 {
72 static void Main()
73 {
74 Heater heater = new Heater();
75 Alarm alarm = new Alarm();
76 //heater.Boiled += alarm.MakeAlert; //注册方法
77 // heater.Boiled += (new Alarm()).MakeAlert; //给匿名对象注册方法
78 // heater.Boiled += new Heater.BoiledEventHandler(alarm.MakeAlert); //也可以这么注册
79 heater.Boiled += Display.ShowMsg; //注册静态方法
80 heater.BoilWater(); //烧水,会自动调用注册过对象的方法
81 Console.ReadKey();
82 }
83 }
84 }