How do I select the Count(*) of an nHibernate Subquery's results

Question

I need to do the following for the purposes of paging a query in nHibernate:

Select count(*) from 
(Select e.ID,e.Name from Object as e where...)
         


        

Answer 1

var session = GetSession();
var criteria = session.CreateCriteria(typeof(Order))
                    .Add(Restrictions.Eq("Product", product))
                    .SetProjection(Projections.CountDistinct("Price"));
return (int) criteria.UniqueResult();