Supporting foreach with IEnumerable and IEnumerator : IEnumerable « Class « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Class
3. IEnumerable

using System;
using System.Collections;
   
class Rainbow : IEnumerable, IEnumerator
{
    private short IteratorIndex = -1;
   
    public IEnumerator GetEnumerator()
    {
        return this;
    }
   
    public object Current
    {
        get
        {
            switch(IteratorIndex)
            {
                case 0:
                    return "Red";
                case 1:
                    return "Orange";
                case 2:
                    return "Yellow";
                case 3:
                    return "Green";
                case 4:
                    return "Blue";
                case 5:
                    return "Indigo";
                case 6:
                    return "Violet";
                default:
                    return "*** ERROR ***";
            }
        }
    }
   
    public bool MoveNext()
    {
        IteratorIndex++;
        if(IteratorIndex == 7)
            return false;
        return true;
    }
   
    public void Reset()
    {
        IteratorIndex = -1;
    }
   
    public static void Main()
    {
        Rainbow MyRainbow = new Rainbow();
   
        foreach(string ColorName in MyRainbow)
            Console.WriteLine(ColorName);
    }
}