这个在查询的进程中会分作几个SQL查询而且会将前面查询的功效作为后头查询的部门条件来举办了，待整个查询完毕后再在内存中将这些功效组合到一个query工具中。
3 ThenInclude用法上面的先容完了之后，你应该可以或许大白这个Include的详细寄义和用法了，接着上面的例子，假如WarrantyWarningLevel内里尚有通过外键Id去关联此外实体，这个时候ThenInclude就派上了用场了，理论上只要互相之间成立了这种外键干系就可以一直ThenInClude下去，可是一般环境下不会用到这么巨大的环境，虽然这内里每一个Include也都是作为一个单独的查询来举办的，这个也可以找详细的例子举办试验，这里也贴出一个详细的例子吧。
public async Task<GetRepairContractDetailForSettlementOutput> GetById(Guid id) { var repairContract = await _repairContractRepository.GetAll() .Include(d => d.RepairContractWorkItems) .ThenInclude(w => w.Materials) .FirstOrDefaultAsync(r => r.Id == id); if (repairContract == null) throw new ValidationException(_localizer["当前维修条约不存在"]); var vehicleSold = _vehicleSoldRepository.Get(repairContract.VehicleId); var isTrafficSubsidy = _repairContractManager.IsTrafficSubsidy(repairContract.Id); var (nextMaintenanceMileage, nextMaintenanceTime) = _repairContractManager.GetNextMaintainInfo(repairContract, vehicleSold); var result = new GetRepairContractDetailForSettlementOutput() { Id = repairContract.Id, Code = repairContract.Code, CustomerName = repairContract.CustomerName, CellPhoneNumber = repairContract.CellPhoneNumber, Vin = repairContract.Vin, LicensePlate = repairContract.LicensePlate, NextMaintenanceTime = nextMaintenanceTime, NextMaintenanceMileage = nextMaintenanceMileage, LaborFee = repairContract.LaborFee, LaborFeeAfter = repairContract.LaborFeeAfter, MaterialFee = repairContract.MaterialFee, MaterialFeeAfter = repairContract.MaterialFeeAfter, OutFee = repairContract.OutFee, OtherFee = repairContract.OtherFee, TotalFeeAfter = repairContract.TotalFeeAfter, ShowIsTrafficSubsidy = isTrafficSubsidy, LastMaintenanceTime = vehicleSold.LastMaintenanceTime, LastMaintenanceMileage = vehicleSold.LastMaintenanceMileage, WorkItems = _mapper.Map<IList<GetRepairContractWorkItemForSettlementOutput>>(repairContract.RepairContractWorkItems) }; return result; }