Extension class adding FirstOrDefaultLazy to RavenDB

RavenDBExtensions.cs

    public static class RavenDBExtensions
    {
        public static Lazy<T> FirstOrDefaultLazy<T>(this IQueryable<T> query, Func<T, bool> predicate)
        {
            if (query == null) throw new ArgumentNullException("query");
            if (predicate == null) throw new ArgumentNullException("predicate");

            return query.Where(x => predicate(x)).FirstOrDefaultLazy();
        }

        public static Lazy<T> FirstOrDefaultLazy<T>(this IQueryable<T> query)
        {
            if (query == null) throw new ArgumentNullException("query");

            var lazyResults = query.Lazily();
            return new Lazy<T>(() => lazyResults.Value.FirstOrDefault());
        }
    }