LINQ到实体嵌套选择填充

Question

I'm trying to return a result and a nested result in a linq to entities query.

Orders[] orderlist =
(from m in db.Orders.Include("OrderLines")
    where
    areas.Contains(m.Area)
    && m.Branch == branch
    && (m.OrderStatus == "1" || m.OrderStatus == "4")
    && m.SpecialInstrs == string.Empty
    select m
HOW??---> m.OrderLines = m.OrderLines.Where(p => (p.LineType == "1" || p.LineType == "7") && p.MBomFlag != "C").ToArray()
).ToArray();

The problem is that the include returns all the FK'd OrderLines for each order when I really only want certain order lines.

How do I do this?

Orders and OrderList are both POCO entities generated by L2E and the poco entity generator.

Answer 1

You can manually join them:

Orders[] orderlist = (from m in db.Orders
                      join p in db.Orderlines
                        on p.OrderId = m.Id
                      where areas.Contains(m.Area) 
                        && m.Branch == branch
                        && (m.OrderStatus == "1" || m.OrderStatus == "4")
                        && m.SpecialInstrs == string.Empty
                        && (p.LineType == "1" || p.LineType == "7")
                        && p.MBomFlag != "C"
                      select m).ToArray();