转换错误无法将类型转换为System.Data.Objects.DataClasses.EntityCollection

Question

我正在尝试使用Entity Framework更新连接表，但是我没有达到远程，因为我收到了转换错误：

  

无法将类型转换为System.Data.Objects.DataClasses.EntityCollection

因此，当我尝试将Passenger对象传递给Flight实体时，它无法进行转换。

这是表结构：

Flight table - FlightID PK
Passenger Table - Passenger ID PK
Passenger_Flight table - PassengerID PK,FlightID PK


        if (isValid())
        {
            Passenger cpass = ((Passenger)passengerIDComboBox.SelectedItem);

            Flight newflight = new Flight { 

                Rego = planeRegoComboBox.SelectedItem.ToString(),
                DepartureTime = departureDateTimePicker.Value,
                ArrivalTime = arrivalDateTimePicker.Value,
                DepartureLocation = departureLocationComboBox.GetItemText(departureLocationComboBox.SelectedItem),
                ArrivalLocation = arrivalLocationComboBox.GetItemText(arrivalLocationComboBox.SelectedItem),

                Passengers = cpass // this is the problem. Cannot convert type to System.Data.Objects.DataClasses.EntityCollection

        };
            flightEntity.Flights.AddObject(newflight);

            Validate();
            //flightEntity.Passengers.AddObject(pass);
            flightEntity.SaveChanges();
            refreshItems();

        }

提前致谢。我希望我提供了足够的信息。此问题与https://stackoverflow.com/questions/19087747/an-object-with-a-temporary-entitykey-value-cannot-be-attached-to-an-object-cont

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