NHibernate投影,它支持投影内部对象吗?

Hibernate+NHibernatelinq是否支持内部对象的投影。

例如,当我尝试以下操作时,在对queryable.tolist()的调用中,会在患者对象上得到一个超出界限的索引异常

            var registrations = from r in _session.Linq<Domain.Registration>().Expand("Patient") select r;
        var queryable = registrations.Select(
            r => new { r.Id, r.AccountNumber, r.DateAdded, r.DateUpdated, r.Patient.FamilyName, r.Patient});
        var list = queryable.ToList();

        var workListItems = new List<WorkListItem>();
        foreach (var anonymous in list)
        {
            var w = new WorkListItem
            {
                Id = anonymous.Id,
                ClientAccountId = anonymous.AccountNumber,
                DateAdded = anonymous.DateAdded,
                DateUpdated = anonymous.DateUpdated,
                Patient = anonymous.Patient
            };
            workListItems.Add(w);
        }
        return workListItems;