我有两个表:Vehicles和Workers。Vehicle(Id,Number)Workers(Id,Name,ContractorVehicleNumber)我想编写lambda查询以返回所有车辆和承包商车辆。像在sql中的东西:SELECTId,NumberFROMVehicleUNIONSELECTNULL,ContractorVehicleNumberFROMWorkers这是我做的:publicIQueryableGet(boolincludeContractorVehicles){IQueryablequery=GetQuery();if(includeContracto