unitofwork and repositorypattern 一个实体对象不能被 IEntityChangeTrac

我有一个复杂的对象，它引用了其他对象，我正在尝试从我的 Web 应用程序中保存它。

因此，在我的 Web 应用程序中，我调用业务逻辑，从 bl 调用 DAL 外观，然后调用 DAL。

当我执行 Insert 方法时，我遇到了异常。

DAL 层中的代码，这是引发异常的地方。

public void InsertEcoBonusRequest(EcoBonusRequest ecoBonusRequest)
        {
            _context.EcoBonusRequests.Add(ecoBonusRequest);
        }

工作单元中的代码.cs

public void Save()
        {
            _context.SaveChanges();
        }
 private RequestBaseRepository _requestBaseRepository;
 public EcoBonusRequestRepository EcoBonusRequestRepository
            {
                get
                {
                    return _ecobonusworkflowRepository ??
                            (_ecobonusworkflowRepository = new EcoBonusRequestRepository(_context));
                }
            }

达尔门面中的代码：

private  static readonly UnitOfWork UnitOfWork = new UnitOfWork();
        public void Save(EcoBonusRequest ecoBonusRequest)
        {
            UnitOfWork.EcoBonusRequestRepository.InsertEcoBonusRequest(ecoBonusRequest);
        }

提单中的代码

public void Save(EcoBonusRequest ecoBonusRequest)
        {
            EcoBonusRequestFacade.Save(ecoBonusRequest);
}

**Code in the page.aspx.cs, as you can see the element ecobonusworkflow is neverstored in the database, but the navigation entities are stored already.**
 var dealer = DealerBL.GetDealer(Nuteres);
  var requester = RequesterBL.GetRequester(int.Parse(DdlRequester.SelectedItem.Value));
                var selectedVehicle = VehicleBL.GetVehicle(VehicleInformationControl.Chassis);

var ecoBonusWorkflow = new EcoBonusRequest
                {
                    IsOnHold = true,
                    AmmountWithoutVAT = decimal.Parse(TxtVatExcluded.Text),
                    AmmountWithVAT = decimal.Parse(TxtVatIncluded.Text),
                    BrandReturnedVehicle = TxtBrandReturnedVehicle.Text,
                    ChassisReturnedVehicle = TxtChasisReturnedVehicle.Text,
                    Percentage = (decimal.Parse(TxtVatExcluded.Text)/VehicleInformationControl.InvoicedAmmount)*100,
                    Comments = TxtComments.Text,
                    Customer = new Customer
                    {
                        FirstName = TxtFirstName.Text,
                        LastName = TxtLastName.Text,
                        Address = new Address
                        {
                            Street = TxtStreet.Text,
                            Number = TxtNumber.Text,
                            Box = TxtBox.Text,
                            City = TxtCity.Text,
                            Zip = TxtZip.Text
                        }
                    },
                    CurrentStatus = "Approval1",
                    Dealer = dealer,
                    Requester = requester,
                    VehicleDesctructionDate = DateTime.Parse(TxtVehicleDestructionDateReturnedVehicle.Text, userCulture),
                    DestructionCertificateNumberReturnedVehicle = TxtDestructionCertificateNumberReturnedVehicle.Text,
                    TypeReturnedVehicle = TxtTypeReturnedVehicle.Text,
                    Vehicle = selectedVehicle
                };
                EcoBonusRequest = ecoBonusWorkflow;
                UploadFiles();
                RedirectToPage("~/Requests/confirmation.aspx");