public static class CompareExtensions
{
    public static IEnumerable<T> Distinct<T>(this IEnumerable<T> items, Func<T, T, bool> equals, Func<T, int> hashCode)
    {
        return items.Distinct(new DelegateEqualityComparer<T>(equals, hashCode));
    }

    public static IEnumerable<T> Distinct<T>(this IEnumerable<T> items, Func<T, T, bool> equals)
    {
        return items.Distinct(new DelegateEqualityComparer<T>(equals, null));
    }
}