c# - 检索最后5个订单的单位

参考：nhibernate criteria for selecting from different tables
我试着取回最后5个订单，但我拿到了最后5个！

Model.Order orderAlias = null;
Model.Unit unitsAlias = null;
Model.Employee employeeAlias = null;

IList<Model.Unit> itemList = null;

using (m_hibernateSession.BeginTransaction())
{
    var query = m_hibernateSession.QueryOver<Model.Unit>(() => unitsAlias)
                    .JoinAlias(() => unitsAlias.OrderRef, () => orderAlias, JoinType.InnerJoin)
                    .JoinAlias(() => unitsAlias.EmployeeRef, () => employeeAlias, JoinType.InnerJoin);

    // add additional filters if set
    if (propertiesNames.Keys.Contains("Employee")) query.Where(Restrictions.On(() => employeeAlias.Name).IsLike( "%" + (string)propertiesNames["Employee"] + "%"));
    if (propertiesNames.Keys.Contains("Division")) query.Where(() => unitsAlias.Division == (string)propertiesNames["Division"]);

    query.Where(() => orderAlias.PONumber != 0).OrderBy(() => orderAlias.PONumber).Desc.Take(5);

    itemList = query.List<Model.Unit>();
}

最后5个订单的单位需要做哪些更改？
谢谢

最佳答案

试试这个：

    //A List (with a maximum of 5 elements) of Lists of Units
    List<List<Model.Unit>> listOfUnits = m_hibernateSession
                                        .Query<Order>()
                                        .OrderByDescending(o=>o.PONumber)
                                        .Where(o => o.PONumber != 0)
                                        .Take(5)
                                        .Select(o => o.Units.ToList())
                                        .ToList();

    //OR, a List of all Units for the last 5 Orders
   List<Model.Unit> listOfUnits = m_hibernateSession
                                        .Query<Order>()
                                        .OrderByDescending(o=>o.PONumber)
                                        .Where(o => o.PONumber != 0)
                                        .Take(5)
                                        .SelectMany(o => o.Units)
                                        .ToList();