你将如何实现IEnumerator接口？

using System;
using System.Collections;

public class MyEnumerable : IEnumerator
{
    private int[] _numbers = { 1, 2, 3, 4, 5 };
    private int _position = -1;

    public object Current
    {
        get
        {
            if (_position < 0 || _position >= _numbers.Length)
            {
                throw new InvalidOperationException();
            }
            return _numbers[_position];
        }
    }

    public bool MoveNext()
    {
        _position++;
        return (_position < _numbers.Length);
    }

    public void Reset()
    {
        _position = -1;
    }

    public IEnumerator GetEnumerator()
    {
        return (IEnumerator)this;
    }
}

public class Program
{
    public static void Main()
    {
        MyEnumerable myEnumerable = new MyEnumerable();
        foreach (int number in myEnumerable)
        {
            Console.WriteLine(number);
        }
    }
}