Adding a migrations gives filename already exists

Question

I have enabled migrations as such:

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

I specified my context as it is in a separated namespace, and i specified the directory because i want to have the migrations in a different directory.

After enabling the migrations like this, i get the expected configuration file in the expected location (Identity\Migrations folder) (i removed the comments in the seed procedure)

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

After this I create a migration:

add-migration Initial

But then i get an error stating that the file already exists:

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.

When i look in the solution explorer (after refreshing) the file is there, but excluded from the project.

When I remove the MigrationsDirectory = "Identity\Migrations" it is working fine (but the migration file is being created in \Migrations)

I dont think it is relevant but to be sure: I'm also using Team explorer 2013 for source control on this project.

Answer 1

Your folder name is malformed so EF thinks it is a file. Try using a single backslash here: -MigrationsDirectory Identity\Migrations instead of -MigrationsDirectory Identity\\Migrations