List Extensins Demo

demo.cs

using System.Collections.Generic;
using System;
using System.Linq;
namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {

            var e = 1.To(5).Step(2);

            var l = new List<int>();
            1.To(5).Step(2).ForEach(x => l.Add(x));
            var l2 = 1.To(5).Step(2).ToList();

        }
    }

    public static class Exts
    {

        public static IEnumerable<int> To(this int from, int to)
        {
            if (from < to)
            {
                while (from <= to)
                {
                    yield return from++;
                }
            }
            else
            {
                while (from >= to)
                {
                    yield return from--;
                }
            }
        }



        public static IEnumerable<T> Step<T>(this IEnumerable<T> source, int step)
        {
            if (step == 0)
            {
                throw new ArgumentOutOfRangeException("step", "Param cannot be zero.");
            }

            return source.Where((x, i) => (i % step) == 0);
        }

        public static void ForEach<T>(this IEnumerable<T> enumeration, Action<T> action)
        {
            foreach (T item in enumeration)
            {
                action(item);
            }
        }


    }
}