Implement IEnumerable and IEnumerator : IEnumerator « Data Structure « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Data Structure
3. IEnumerator

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(); 
  } 
}

A B C D
A B C D