有一个场景我只需从实体中选择一个/几个列,但在查询中只有多个子项。 我一直在尝试使用投影,但在collections属性上遇到错误。这是一种正常情况,但无法找到有关投影集合的信息 - 仅限属性。
Customer customerAlias = null;
Order orderAlias = null;
var list = _session.QueryOver<Customer>(() => customerAlias)
.JoinAlias(x => x.Orders, () => orderAlias, JoinType.LeftOuterJoin)
.Select(
Projections.Property(() => customerAlias.Name),
Projections.Property(() => customerAlias.Orders))//this is the issue
.List<object>();
返回的错误是:
System.IndexOutOfRangeException : Index was outside the bounds of the array
答案 0 :(得分:3)
无法在NH 3.3中完成。 https://nhibernate.jira.com/browse/NH-3176
答案 1 :(得分:2)
如何反转查询(假设Order具有Customer属性):
var list = _session.QueryOver<Order>()
.Select(
Projections.Property(o => o.Customer.Name),
Projections.Property(o => o.OrderProperty1),
Projections.Property(o => o.OrderProperty2)) // etc..
.List<object[]>();