Implement IEnumerable and IEnumerator : IEnumerator : Data Structure C# Examples

    
using  System;  
using  System.Collections;  
  
class  MyClass  :  IEnumerator,  IEnumerable  {  
    char[]  chrs  =  {  'A',  'B',  'C',  'D'  };  
    int  index  =  -1;  
  
    //  Implement  IEnumerable.  
    public  IEnumerator  GetEnumerator()  {  
        return  this;  
    }  
  
    //  The  following  methods  implement  IEnumerator.  
  
    //  Return  the  current  object.  
    public  object  Current  {  
        get  {  
            return  chrs[index];  
        }  
    }  
  
    //  Advance  to  the  next  object.    
    public  bool  MoveNext()  {  
        if(index  ==  chrs.Length-1)  {  
            Reset();  //  reset  enumerator  at  the  end.  
            return  false;  
        }  
          
        index++;  
        return  true;  
    }  
        
    //  Reset  the  enumerator  to  the  start.  
    public  void  Reset()  {  
        index  =  -1;  
    }    
}  
  
class  MainClass  {  
    public  static  void  Main()  {  
        MyClass  mc  =  new  MyClass();  
  
        //  Display  the  contents  of  mc.  
        foreach(char  ch  in  mc)  
            Console.Write(ch  +  "  ");  
  
        Console.WriteLine();  
  
        //  Display  the  contents  of  mc,  again.  
        foreach(char  ch  in  mc)  
            Console.Write(ch  +  "  ");  
  
        Console.WriteLine();  
    }  
}