如何首先在代码上定义复合主键 [英] How to define composite primary key on code first

问题描述

任何人，请帮我先在代码上定义复合主键，它不能同时定义两个属性代码

Anyone, please help me to define composite primary key on code first, it cannot to define both property code as below

Public Class TaskMapper
    Overridable Property TaskType As TaskType
    Overridable Property Task As Task
End Class

Public Class TaskType
    Inherits MasterData
End Class

Public Class Task
    Inherits MasterData
End Class

Public MustInherit Class MasterData
    Public Property Code() As String
    Public Property Name() As String
    Public Property Status() As String
End Class

Protected Overrides Sub OnModelCreating(ByVal modelBuilder As DbModelBuilder)
     'on this command raised an error  
modelBuilder.Entity(Of TaskMapper).HasKey(Function(tm) New With {tm.Task.Code, tm.TaskType.Code})
End Sub

我尝试过：



能够定义复合主键

What I have tried:

Able to define composite primary key

推荐答案

现在，我已经通过以下代码解决了这个问题

now, I solved this problem already by code as below

Quote：

公共类TaskMapper

'公共属性ID为整数

<键，> _

属性TaskTypeCode As String

可覆盖属性TaskType As TaskType

< key，> _

属性TaskCode As String

可覆盖属性任务为任务

结束类

Public Class TaskMapper
'Public Property ID As Integer
<key,> _
Property TaskTypeCode As String
Overridable Property TaskType As TaskType
<key,> _
Property TaskCode As String
Overridable Property Task As Task
End Class

谢谢

thank you

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