1 using System.Collections;
 2 
 3 class ColorEnumerator:IEnumerator
 4 {
 5     string [] Colors;    
 6     int Position=-1;
 7 
 8     public object Current
 9     {
10         get
11         {
12             if(Position==-1)
13                 return new Exception();
14             if(Position==Colors.Length)
15                 return new Exception();
16             return Colors[Position];
17         }
18     }
19 
20     public bool MoveNext()
21     {
22         if(Position<Colors.Length-1)
23         {
24             Position++;
25             return true;
26         }
27         else
28         {
29             return false;
30         }
31     }
32 
33     pulic void Reset()
34     {
35         Position=-1;
36     }
37 
38     public ColorEnumerator(string[] theColors)
39     {
40         Colors=new string[theColors.Length];
41         for(int i=0;i<theColors.Length;i++)
42         {
43             Colors[i]=theColors[i];
44         }
45     }
46 }

1 class MyColors:IEnumerable
2 {
3     string[] Colors={"","",""};
4     public IEnumerator GetEnumerator()//返回Ienumerator类型的对象，也就是可枚举类型
5     {
6         return new ColorEnumerator(Colors);
7     }
8 }