1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace KoalaOldLife
 8 {
 9     class Koala
10     {
11         public void Water() { Console.WriteLine("Find Water"); }
12         public void Rice() { Console.WriteLine("Find Rice"); }
13         public void Meat() { Console.WriteLine("Find Meat"); }
14 
15         public void Need()
16         {
17             Water();
18             Rice();
19             Meat();
20         }
21     }
22 
23     class Program
24     {
25         static void Main(string[] args)
26         {
27             Koala koala = new Koala();
28             koala.Need();
29             Console.ReadKey();
30         }
31     }
32 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace KoalaLife
 8 {
 9     class Water
10     {
11         public void showWater() { Console.WriteLine("Here's the Water!"); }
12     }
13 
14     class Rice
15     {
16         public void showRice() { Console.WriteLine("Here's the rice"); }
17     }
18 
19     class Meat
20     {
21         public void showMeat() { Console.WriteLine("Here's the meat"); }
22     }
23 
24     delegate void Dad(); //定义委托
25     delegate void Mom();
26 
27     class Koala
28     {
29         public event Dad thirsty; //定义事件
30         public event Mom hungry;
31 
32         public void Need()
33         {
34             thirsty(); //调用事件
35             hungry();
36         }
37     }
38 
39     class Program
40     {
41         static void Main(string[] args)
42         {
43             Koala koala = new Koala();
44             koala.thirsty += (new Water()).showWater; //绑定事件对应的方法
45             koala.hungry += (new Rice()).showRice;
46             koala.hungry += (new Meat()).showMeat;
47 
48             koala.Need();
49             Console.ReadKey();
50         }
51     }
52 }