Question

Trying out Linq for NHibernate and first noticed this:

    var list1 = (from ut in session.Linq<UserThings>()
    where ut.User.ID == 10
    select ut).ToList();

    var list2 = session.CreateCriteria(typeof (UserThings), "ut")
    .Add(Expression.Eq("ut.User.ID", 10))
    .List<UserThings>();

This first query will join on the 'User' table, but the second will not. Somehow the second knows that UserID is the foreign key and that it doesn't need to perform the join to filter.

Answer 1

The best piece of advice anyone will give you is don’t use Linq2NH unless you are writing a very basic, home-made application.

Its very immature, its slow, only supports basic queries, doesn’t support caching, eager loading, grouping…. I spent 6 months using it before I abandoned it and made the effort to learn HQL/Criteria.