Question

我无法弄清楚我在这里做错了什么。 MVC的新手和Entity的新手，所以我知道这让我退缩了。任何时候我打电话给AuthUser，AuthRole总是什么都没有，所以我最终做了类似的事情：

authuser.AuthRole = db.AuthRoleSet.Find(2) 'AuthRoleID of 2 = User

这对我来说很笨拙。如何让我的财产真正获得用户的角色？

这是我的班级结构：公共类AuthUser '全球类 Dim db As New AuthUserContext

    'Properties
    Public Property AuthUserID() As Integer

    <Required()> _
    <Display(Name:="User Name")> _
    <DomainUserValidation()> _
    Public Property UserName() As String

    <Display(Name:="Current Role")> _
    Public Property AuthRole As AuthRole

End Class

Public Class AuthRole
    Public Property AuthRoleID() As Integer

    <Required()> _
    <Display(Name:="Role Name")> _
    Public Property RoleName() As String

    <Required()> _
    <Display(Name:="Is Administrator")> _
    Public Property isAdministrator() As Boolean

    <Required()> _
    <Display(Name:="Is Active")> _
    Public Property isActive() As Boolean

    <Required()> _
    Public Property AuthUser As ICollection(Of AuthUser)

End Class

Public Class AuthUserContext
    Inherits DbContext
    Public Property AuthUserSet() As DbSet(Of AuthUser)
    Public Property AuthRoleSet() As DbSet(Of AuthRole)
End Class

Answer 1

您有2个选项（抱歉c＃语法）：

1 - 在您需要时延迟加载AuthRole - 为此，您的AuthRole属性需要声明为virtual

public virtual AuthRole {get;set;}

现在，当您尝试访问AuthRole时，EF会从数据库中获取它。为此，您需要DbContext.Configuration.LazyLoadEnabled = true

另一种选择是通过使用如下查询来急切加载它：

var myUserWithRole = myContext.AuthUsers.Include("AuthRole").FirstOrDefault(x=>x.Id == userId);

这将从数据库中获取用户和角色。

Code First Entity / MVC4 - 为什么我的模型没有水合？

1 个答案: