ASP.NET MVC导航属性

Question

我希望在我的“注册”课程中添加一个导航属性，这样我就可以访问父“人”了。

理想情况下，我可以添加Public Overrideable Property ParentPerson as Person，但我似乎无法让它工作，因为它抱怨关联的主要结束。

Public Class Person
    <Required()>
    Public Property ID As Integer

    <Required()>
    <StringLength(150)>
    Public Property Firstname As String

    <Required()>
    <StringLength(150)>
    Public Property Lastname As String

    Public Overridable Property Registration As Registration
End Class

Public Class Registration

    <Required()>
    Public Property ID As Integer 

    Public Property RegistrationDate As Date

    Public Overridable Property Sessions As List(Of RegistrationSession)

End Class