使用事件机制模拟非常6+1

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 namespace 使用事件模拟非常6_1
 6 {
 7     class Program
 8     {
 9         static void Main(string[] args)
10         {
11             Host host = new Host();
12             host.Name = "李咏";
13             host.eventArgs.QuestionArgs = "C#的事件如何实现的";
14             Guest[] gArray = new Guest[2]{
15                 new GuestA(){Gname="张三"},
16                 new GuestB(){Gname="李四"}
17             };
18             //将嘉宾的答题方法加入委托链
19             host.questionEvent += gArray[0].answer;
20             host.questionEvent += gArray[1].answer;
21             //触发事件
22             host.Ask();
23             Console.ReadLine();
24         }
25     }
26     ///
27     /// 问题参数类
28     ///
29     public class QuestionArg :EventArgs
30     {
31         public string QuestionArgs { get; set; }
32     }
33     ///
34     /// 主持人类
35     ///
36     public class Host
37     {
38         public Host()
39         {
40             eventArgs = new QuestionArg();
41         }
42         //主持人名称
43         public string Name { get; set; }
44         public QuestionArg eventArgs { get; set; }
45         //定义委托与事件
46         public delegate void QuestionHandler(object sender, QuestionArg args);
47         public event QuestionHandler questionEvent;
48         //主持人提问问题的方法
49         public void Ask()
50         {
51             Console.WriteLine("开始答题");
52             questionEvent(this, this.eventArgs);
53         }
54     }
55     ///
56     /// 嘉宾父类
57     ///
58     public class Guest
59     {
60         public string Gname { get; set; }
61         //答题方法，虚方法
62         public virtual void answer(object sender, QuestionArg e)
63         {
64             Console.WriteLine("事件的发出者：" + (sender as Host).Name);
65             Console.WriteLine("问题是："+e.QuestionArgs);
66         }
67     }
68     ///
69     /// 嘉宾A
70     ///
71     public class GuestA:Guest
72     {
73         public override void answer(object sender, QuestionArg e)
74         {
75             base.answer(sender, e);
76             Console.WriteLine(this.Gname + "开始答题：我不知道！");
77         }
78     }
79     ///
80     /// 嘉宾B
81     ///
82     public class GuestB : Guest
83     {
84         public override void answer(object sender, QuestionArg e)
85         {
86             base.answer(sender, e);
87             Console.WriteLine(this.Gname + "开始答题：这个有点难！");
88         }
89     }
90 }