IEnumerable vs IQueryable

Question

I have a query:

topics.OrderBy(x => x.Replies.Any() ? x.Replies.OrderBy(y => y.PostedDate).Last().PostedDate : x.PostedDate);

It sorts th

Answer 1

Have you tried topics.OrderBy(x => x.Replies.Any() ? x.Replies.Max(y => y.PostedDate) : x.PostedDate);?