自定义迭代器使用foreach

public class MyList
{
   private string[] list=null;
   public MyList(string[] sArg)
  {
     list = sArg;
  }
   public int Count{get{return list.Length;}}
   public IEnumerator GetEnumerator()
  {
     return new MyListEnumerator(list);
  }
}

public class MyListEnumerator:IEnumerator
{
   private string[] list=null;
   private int index=-1;
   
   public MyListEnumerator(string[] sArg)
   {
      list = sArg;
   }

   public string Current{get{return list[index];}}
   public bool MoveNext()
   {
      bool result = false;
      if(index+1<list.Length)
      {
         ++index ;
         result=true;
      }
      return result;
    }
}