我在Web应用程序中首次使用EF6数据库。有一个实体涉及两个1对多关系（本例中的E2）：
E1＆lt; --- E2 ---＆gt; E3
E1和E3都有E2的导航属性（称为E2s）。当我尝试使用E3的ListView时，我收到标题中列出的错误。如果我从E3中删除E2的导航属性，一切正常！我试过整个谷歌都无济于事。任何帮助/方向将不胜感激。
于5/15添加：
tmg - 希望这就是你想要的。
这将是＆＃39; E2＆＃39;在我的例子中：
Imports System
Imports System.Collections.Generic
Partial Public Class contact
Public Property contact_id As Integer
Public Property implementation_id As Integer
Public Property contact_type_id As Integer
Public Property name As String
Public Property user_id As String
Public Property is_main_contact As Boolean
Public Property email_address As String
Public Overridable Property contact_type As contact_type
Public Overridable Property implementation As implementation
End Class
接下来的两个是E1和E3：
Imports System
Imports System.Collections.Generic
Partial Public Class contact_type
Public Property contact_type_id As Integer
Public Property contact_type_description As String
Public Overridable Property contacts As ICollection(Of contact) = New HashSet(Of contact)
End Class
Imports System
Imports System.Collections.Generic
Partial Public Class implementation
Public Property implementation_ID As Integer
Public Property user_ID As String
Public Property comments As String
Public Property creation_date As Nullable(Of Date)
Public Property customer_name As String
Public Property customer_global_name As String
Public Property customer_address As String
Public Property customer_country As String
Public Property service_order_number As String
Public Property title As String
Public Property contact_name As String
Public Overridable Property Country As Country
Public Overridable Property supportDetail As support_detail
Public Overridable Property tradeCompliance As trade_compliance
Public Overridable Property statusEffDates As ICollection(Of implementation_status_eff_date) = New HashSet(Of implementation_status_eff_date)
Public Overridable Property hwsData As hws_data
Public Overridable Property documents As ICollection(Of document) = New HashSet(Of document)
Public Overridable Property contacts As ICollection(Of contact) = New HashSet(Of contact)
End Class
这是列表视图代码：
Imports System.Web.ModelBinding
Public Class ImplementationList
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
End Sub
Public Function GetImplementations(<QueryString("id")> categoryId As System.Nullable(Of Integer)) As IQueryable(Of implementation)
Dim db = New RFI_SDM.RFI_DataEntities
Dim query As IQueryable(Of implementation) = db.implementations
Return query
End Function
End Class
最后是RFI_DataEntities的代码：
Imports System
Imports System.Data.Entity
Imports System.Data.Entity.Infrastructure
Partial Public Class RFI_DataEntities
Inherits DbContext
Public Sub New()
MyBase.New("name=RFI_DataEntities")
End Sub
Protected Overrides Sub OnModelCreating(modelBuilder As DbModelBuilder)
Throw New UnintentionalCodeFirstException()
End Sub
Public Overridable Property Countries() As DbSet(Of Country)
Public Overridable Property implementations() As DbSet(Of implementation)
Public Overridable Property replacement_type() As DbSet(Of replacement_type)
Public Overridable Property service_level_choice() As DbSet(Of service_level_choice)
Public Overridable Property support_detail() As DbSet(Of support_detail)
Public Overridable Property tat_end_choice() As DbSet(Of tat_end_choice)
Public Overridable Property tat_measurement_basis() As DbSet(Of tat_measurement_basis)
Public Overridable Property tat_start_choice() As DbSet(Of tat_start_choice)
Public Overridable Property regions() As DbSet(Of region)
Public Overridable Property contacts() As DbSet(Of contact)
Public Overridable Property contact_type() As DbSet(Of contact_type)
Public Overridable Property hws_data() As DbSet(Of hws_data)
Public Overridable Property implementation_mgr() As DbSet(Of implementation_mgr)
Public Overridable Property implementation_service_level() As DbSet(Of implementation_service_level)
Public Overridable Property implementation_status() As DbSet(Of implementation_status)
Public Overridable Property implementation_status_eff_date() As DbSet(Of implementation_status_eff_date)
Public Overridable Property trade_compliance() As DbSet(Of trade_compliance)
Public Overridable Property implementation_type() As DbSet(Of implementation_type)
Public Overridable Property documents() As DbSet(Of document)
Public Overridable Property document_type() As DbSet(Of document_type)
Public Overridable Property LCM_Data() As DbSet(Of LCM_Data)
Public Overridable Property LCM_document() As DbSet(Of LCM_document)
End Class
我得到的实际错误是：
指定的架构无效。错误： 关系＆＃39; RFI_DataModel.FK_contact_contact_type＆＃39;未加载，因为类型＆＃39; RFI_DataModel.contact＆＃39;不可用。
关系＆＃39; RFI_DataModel.FK_contact_implementation＆＃39;未加载，因为类型＆＃39; RFI_DataModel.contact＆＃39;不可用。
如果我删除了联系人＆＃39;来自contact_type和实现类的导航属性，列表视图加载没有问题。