存储库记录中发生了奇怪的事情!

亚音速2.2。我使用存储库记录模式,其中有一个表“appointment”,其中appointmentid为自动递增int。

我正在尝试更新它,但是当我用完全不同的内容更新字段时,脏列总是零,我得到一个异常。

System.NullReferenceException:对象引用未设置为对象的实例。位于subsonic.subsonicrepository.update[t](repositoryrecord)的subsonic.dataservice.executequery(querycommand cmd) 1 item, String userName) at janji.Janji.Data.DB.Update[T](RepositoryRecord 1项)位于a:\source\vs2008\web\apps\janji\janji\classes\dal\allstructs.vb:line 197 at janji.webform4.savedata()in a:\source\vs2008\web\apps\janji\janji\ui\appt.aspx.vb:line 343

以下是我的代码:

        Try
        If Appointment.AppointmentId > 0 Then

            Appointment.AddressName = uxHotel.Text
            Appointment.Address = uxAddress.Text
            Appointment.AppStartTime = Date.Parse(uxApptDate.SelectedDate.Value.ToShortDateString + " " + uxApptStartTime.SelectedDate.Value.ToShortTimeString)
            Appointment.ApptEndTime = Date.Parse(uxApptDate.SelectedDate.Value.ToShortDateString + " " + uxApptEndTime.SelectedDate.Value.ToShortTimeString)
            Appointment.Completed = uxCOmpleted.Checked
            Appointment.DropNumber = uxDropNum.Text
            Appointment.Total = 0
            Appointment.EmployeeId = 0
            Appointment.Model = uxModel.Text
            Appointment.DropAmount = Decimal.Parse(uxDropAmount.SelectedValue)
            Appointment.RoomNumber = uxRoom.Text

            'If Appointment.DirtyColumns.Count > 0 Then
            Janji.Data.DB.Update(Of Janji.Data.Appointment)(Appointment)
            'End If
        End If
    Catch ex As Exception
        _ErrorMessage = ex.ToString
        RetVal = False
        lErrors.Text = _ErrorMessage
        lErrors.Visible = True
    End Try