LINQ在多个smallint列上联接

Question

i am tying to join multiple columns. There is no problem if column type int or string etc.. but my columns types are smallint.

query:

    var getworks = (from loc in db.T_location
                            join wl in db.T_vehicle_work_list 
                            on new {x=loc.Route_id, y=loc.Cash_center_num} 
                            equals new { x=wl.Route_id, y=wl.Cash_center_num}

                                        where wl.Route_id == getVehicleRouteId.Route_id && wl.Cash_center_num == getVehicleRouteId.Cash_center_num
                                        && wl.Status_code != "C"
                                        && wl.Instance_id > bfd
                                        && wl.Instance_id < afd
                             select new { loc, wl }).ToList();

error : "The type of one of the expressions in the join clause is incorrect. Type inference failed in the call to 'Join'."

thanx for help...

Answer 1

If anybody have this problem too. Check the model.edmx column "nullable" properties are same