Question

Working through the summer of nHibernate tutorials have gotten to the section on queries. Seems there have been changes since that series was made. So I went to the online docs for nHB 3.0 but code such as:

IList cats = session.CreateCriteria(typeof(Cat))
            .Add(Expression.Like("Name", "Fritz%"))
            .Add(Expression.Between("Weight", minWeight, maxWeight))
            .List();

Generates the error “The name ‘Expression’ does not exist in the current context”

Code like:

return session.CreateCriteria(typeof(DataTransfer.Customer))
            .Add(new NHibernate.Criterion.LikeExpression("Firstname", firstname))
            .Add(new NHibernate.Criterion.LikeExpression("Lastname", lastname))
            .List<Customer>();

Works but it seems that it is missing a number of query methods like GtExpression.
Are the online docs up to date, and if so, why can’t I use Expression…
If the online docs aren’t up to date then where do I get a description of the Criterion interface?
Thanks

Answer 1

You forgot to add using NHibernate.Criterion;.

Anyway, the Expression class is deprecated. Use Restrictions instead.