相关疑难解决方法(0)

我已经启用了迁移:

enable-Migrations -ProjectName ProjectOne -ContextTypeName MyIdentity.Config.MyIdentityContext -MigrationsDirectory Identity\\Migrations

我指定了我的上下文,因为它位于一个单独的命名空间中,我指定了该目录,因为我希望将迁移放在不同的目录中.

启用此类迁移后,我在预期位置(Identity\Migrations文件夹)中获取预期的配置文件(我删除了种子过程中的注释)

Friend NotInheritable Class Configuration
    Inherits DbMigrationsConfiguration(Of MyIdentityDbContext)

    Public Sub New()
        AutomaticMigrationsEnabled = False
        MigrationsDirectory = "Identity\\Migrations"
    End Sub

    Protected Overrides Sub Seed(context As MyIdentityDbContext)

    End Sub

End Class

在此之后我创建了一个迁移:

add-migration Initial

但后来我得到一个错误,说明该文件已经存在:

Scaffolding migration 'Initial'.
System.Runtime.InteropServices.COMException (0x80040400): Unable to add '201506111233565_Initial.vb'. A file with that name already exists.

Server stack trace: 
at EnvDTE.ProjectItems.AddFromFileCopy(String FilePath)
at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]: …