自定义迭代器使用foreach

 1 public class MyList
 2 {
 3    private string[] list=null;
 4    public MyList(string[] sArg)
 5   {
 6      list = sArg;
 7   }
 8    public int Count{get{return list.Length;}}
 9    public IEnumerator GetEnumerator()
10   {
11      return new MyListEnumerator(list);
12   }
13 }
14 
15 public class MyListEnumerator:IEnumerator
16 {
17    private string[] list=null;
18    private int index=-1;
19    
20    public MyListEnumerator(string[] sArg)
21    {
22       list = sArg;
23    }
24 
25    public string Current{get{return list[index];}}
26    public bool MoveNext()
27    {
28       bool result = false;
29       if(index+1<list.Length)
30       {
31          ++index ;
32          result=true;
33       }
34       return result;
35     }
36 }