ilist swap and move works on arrays

gistfile1.txt

    public static class ListExt //for List<> and IList<>
    {
        public static IList<T> Swap<T>(this IList<T> source, int oldIndex, int newIndex)
        {
            var temp = source[oldIndex];
            source[oldIndex] = source[newIndex];
            source[newIndex] = temp;
            return source;
        }
        public static IList<T> Move<T>(this IList<T> source, int oldIndex, int newIndex)
        {
            var temp = source[oldIndex];
            var min = Math.Min(oldIndex, newIndex);
            var max = Math.Max(oldIndex, newIndex);
            var chi = oldIndex < newIndex ? (new Func<int, int>(i => i + 1)) : (i => i - 1);
            var start = oldIndex < newIndex ? min : max;
            var end = oldIndex < newIndex ? max : min;
            var compare = oldIndex < newIndex ? new Func<int, bool>(i => i < end) : i => i > end;
            for (int i = start; compare(i); i=chi(i))
            {
                source.Swap(i, chi(i));
            }
            return source;
        }
    }