Asp.net использует структуру сущностей для запуска оператора соединения и отображения в GridView

Question

Schedule таблица:

ScheduleId(PK), AirplaneId(FK), OriginId(FK), Duration-String

Airplane таблица:

AirplaneId(PK), PlaneCode-String

Origin таблица:

OriginId(PK), OriginName-String

Я хотел что-то отобразитькак:

ScheduleId | PlaneCode | OriginName | Duration

Schedule.vb

Public Class Schedule
Public Property ID As Int32
Public Property Duration As String

'Foreign key of airplane_Id
Public Overridable Property Airplane As Airplane
'Foreign key of origin_Id
Public Overridable Property Origin As Origin  
End Class

Airplane.vb

Public Class Airplane
Public Property ID As Int32
Public Property PlaneCode As String
End Class

Origin.vb

Public Class Origin
Public Property ID As Int32
Public Property OriginName As String
End Class

Моя сетка:

<asp:GridView ID="gvSearchFlight" runat="server" ItemType="CIM.Schedule" SelectMethod="gvSearchFlight_GetData" AutoGenerateColumns="false" GridLines="None">

GridView SelectMethod:

Dim dbContext As New ApplicationDbContext

    Public Function gvSearchFlight_GetData() As IQueryable(Of Schedule)
    Dim schedules = (From sche In dbContext.Schedule
                     Join air In dbContext.Airplane
                    On sche.Airplane.ID Equals air.ID).ToList()
    Return schedules
End Function

Но я продолжаю получать эту ошибку:

Невозможно привести объект типа 'System.Collections.Generic.List 1[VB$AnonymousType_11 2 [CIM.Schedule, CIM.Airplane]]' к типу 'System.Linq.IQueryable`1 [CIM.Расписание] '

Редактировать : Я действительно не знаю, как написать выражение "Выбрать новое" ..

Public Class ScheduleInformation
Public Property Schedule As Schedule
Public Property Airplane As Airplane
Public Property Origin As Origin
End Class

    Public Function gvSearchFlight_GetData() As IQueryable(Of ScheduleInformation)
    Dim schedules = (From sche In dbContext.Schedule
                     Join air In dbContext.Airplane On sche.Airplane.ID Equals air.ID
                     Join ori In dbContext.Origin On sche.Origin.ID Equals ori.ID
                     Select New ScheduleInformation())
    Return schedules
End Function

Answer 1

Вот что я сделал, чтобы решить мою проблему.

ScheduleInformation.vb

Public Class ScheduleInformation
  Public Property Schedule As Schedule
  Public Property Airplane As Airplane
  Public Property Origin As Origin
End Class

SelectMethod GridView

'GridView's SelectMethod to get data
Public Function gvSearchFlight_GetData() As IQueryable(Of ScheduleInformation)
    Dim schedules = (From sche In dbContext.Schedule
                 Join air In dbContext.Airplane On sche.Airplane.ID Equals air.ID
                 Join ori In dbContext.Origin On sche.Origin.ID Equals ori.ID
                 Select New ScheduleInformation With {.Schedule = sche, .Airplane = air, .Origin = ori})
    Return schedules
End Function

Затем в своем теге я написал так:

<asp:GridView ID="gvSearchFlight" runat="server" ItemType="CIM.ScheduleInformation" SelectMethod="gvSearchFlight_GetData" AutoGenerateColumns="false">...