LINQ to SQL和C＃，WPF選擇問題

Question

我有兩個表間，BookedRooms

要select BookedRooms.RoomID(which is more than one) than select Rooms.SizeX and Room.SizeX from Rooms where Room.ID == BoookedRooms.RoomID

比過濾Room.ID列表，只留下ID which != BookedRooms.ID 請幫

Answer 1

我猜？

from bookedRooms in db.BookedRooms 
from rooms in db.Rooms 
where bookedRooms.RoomId == rooms.ID && rooms.ID != bookedRooms.ID 
select new { SizeX = rooms.SizeX, SizeY = rooms.SizeY } 

Answer 2

所以你想要一個房間列表沒有被預訂的權利？

var availableRooms = Rooms.Where(r => !BookedRooms.Any(b => b.RoomID == r.ID);