Enumerator

using System;
using System.Collections;
using System.Collections.Generic;

namespace kq.Research.Basics
{
    class Special : IEnumerable<string>
    {
        List<string> mItems;

        public Special()
        {
            mItems = new List<string>();
        }

        public void Add(string i)
        {
            mItems.Add(i);
        }

        public void Add(params string[] items)
        {
            foreach (string i in items)
                mItems.Add(i);
        }

        #region IEnumerable<string> Members

        public IEnumerator<string> GetEnumerator()
        {
            foreach (string s in mItems)
                yield return s;

            // or use List<T>
            //return mItems.GetEnumerator();
        }

        #endregion

        #region IEnumerable Members

        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }

        #endregion
    }

    class Program
    {
        static void Main(string[] args)
        {
            Special s = new Special();
            s.Add("a");
            s.Add("b");
            s.Add("c", "d", "e");
            s.Add(new string[] {"f", "g", "h"});

            foreach (string i in s)
            {
                Console.WriteLine(i);
            }
        }
    }
}