NHibernate Session.Query<>, column list?

问题

We have some code written which depends on working with the IQueryable instances, so I suppose we are stuck with having to use ISession.Query<>().

In one particular case I would like to only partially hydrate the DBOs and exclude certain columns from the SELECT statement which NHibernate will generate. Is it possible to achieve that while using Query<>?

Alternatively, is it possible to somehow go from ICriteria to IQueryable? (I think for ICriteria it is possible to achieve what I need by using Projections?)

回答1:

Projections are supported in IQueryable as well. Syntax should be like this:

var query = session.Query<Employee>();
var list = query.Select(s => new Employee
    {
        FirstName = s.FirstName,
        LastName = s.LastName,
        ...
     })
     .ToList();

The new Employee could be even some DTO...

Some basic info about QueryOver projection API:

• 16.6. Projections

来源：https://stackoverflow.com/questions/25971199/nhibernate-session-query-column-list