添加迁移使文件名已存在

Question

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]: 
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at EnvDTE.ProjectItems.AddFromFileCopy(String FilePath)
at System.Data.Entity.Migrations.Extensions.ProjectExtensions.AddFile(Project project, String path)
at System.Data.Entity.Migrations.Extensions.ProjectExtensions.AddFile(Project project, String path, String contents)
at System.Data.Entity.Migrations.Utilities.MigrationWriter.Write(ScaffoldedMigration scaffoldedMigration, Boolean rescaffolding, Boolean force, String name)
at System.Data.Entity.Migrations.AddMigrationCommand.WriteMigration(String name, Boolean force, ScaffoldedMigration scaffoldedMigration, Boolean rescaffolding)
at System.Data.Entity.Migrations.AddMigrationCommand.Execute(String name, Boolean force, Boolean ignoreChanges)
at System.Data.Entity.Migrations.AddMigrationCommand.<>c__DisplayClass2.<.ctor>b__0()
at System.Data.Entity.Migrations.MigrationsDomainCommand.Execute(Action command)
Unable to add '201506111233565_Initial.vb'. A file with that name already exists.

当我查看解决方案资源管理器(刷新后)文件就在那里,但从项目中排除.

当我删除MigrationsDirectory ="Identity\Migrations"时它工作正常(但是正在\ Migrations中创建迁移文件)

我不认为它是相关的,但是要确定:我也使用Team explorer 2013来对这个项目进行源代码控制.

Answer 1

您的文件夹名称格式错误,因此EF认为它是一个文件.尝试在这里使用一个反斜杠:-MigrationsDirectory Identity\Migrations而不是-MigrationsDirectory Identity\\Migrations