title: NHibernate - get List<long> representing primary keys?
body: <p>I have a situation where I definitely don't want to get the whole domain object.  Basically, the entity has a primary key of long (.NET)/bigint(sql server 2005). I simply need to pass the primary key to an external system which will access the database directly - and since the list of ids could be large, I don't want to rehydrate the entire domain object just to get the Id.</p>
  
  <p>In linq2sql, I could accomplish this with a projection, but I am restricted to NHibernate 1.2.1.4000, which doesn't support Linq.</p>
  
  <p>Is there a way to accomplish this using NHibernate 1.2.1.4000?</p>
  
  <p>(I am open to using a named-query if that will work)</p>