Yet another filter implementation in c#

class Program
    {
        static void Main(string[] args)
        {
            var coll = new[] {1, 2, 4, 22, 23, 12};
            var result = coll.Filter(i => i > 13);
        }
    }

    static class Ext
    {
        public static IEnumerable<T> AsEnumerable<T> (this T item)
        {
            yield return item;
        }

        public static IEnumerable<T> Filter<T>(this IEnumerable<T> items, Predicate<T> predicate)
        {
            return items.Aggregate(Enumerable.Empty<T>(), (ints, arg) => predicate(arg) ? ints.Concat(arg.AsEnumerable()) : ints);
        }
    }