如何使用LINQ獲得不等於功能？

Question

我想從車輛誰在HireGroupDetails沒有比賽，但不知道如何讓不等於功能在LINQ得到所有這些記錄！

var fleetHireGroupDetailQuery = from vehicle in db.Vehicles     
           join hgd in db.HireGroupDetails on 
        new { vehicle.VehicleMakeId, vehicle.ModelYear } 
        equals new { hgd.VehicleMakeId, hgd.ModelYear} 
        select new RptFleetHireGroupDetail 
        { 
          PlateNumber = vehicle.PlateNumber, 
        }; 

Answer 1

我覺得這是你所需要的：

var fleetHireGroupDetailQuery = from vehicle in db.Vehicles 
           where !(from hgd in db.HireGroupDetails 
           select new { hgd.VehicleMakeId, hgd.ModelYear}).Contains(new { vehicle.VehicleMakeId, vehicle.ModelYear }) 
        select new RptFleetHireGroupDetail 
        { 
          PlateNumber = vehicle.PlateNumber, 
        };