Question

Using Entity Framework 5.0.0 RC/EF 5.x DbContext Generator for C#/Visual Studio 2012 RC/.NET 4.0, I’m trying to enable automatic migrations in my project. I’ve run enable-migrations in the Package Manager Console:

PM> enable-migrations
No classes deriving from DbContext found in the current project.
Edit the generated Configuration class to specify the context to enable migrations for.
Code First Migrations enabled for project Test.

As you can see, it didn’t automatically detect my DbContext derived type, but I solved this easily enough by entering the name of this type in the generated code file, Migrations/Configuration.cs.

However, the next step, the Package Manager Console command enable-migrations fails due to not finding the migrations configuration type added by the previous step.

PM> add-migration Initial
No migrations configuration type was found in the assembly 'Test'. (In Visual Studio you can use the Enable-Migrations command from Package Manager Console to add a migrations configuration).

How can I solve this?

EDIT: I found that I could specify the name of the configuration type with the parameter -ConfigurationTypeName:

PM> add-migration -ConfigurationTypeName Test.Migrations.Configuration Initial
The type 'Configuration' is not a migrations configuration type.

This still doesn’t work, but at least it elucidates why add-migration bails, i.e. it thinks Test.Migrations.Configuration isn’t a migrations configuration type. Does anyone have a clue as to why it isn’t accepted, given that it was generated by enable-migrations? See the generated code below for reference (UserModelContainer derives from DbContext):

namespace Test.Migrations
{
    using System;
    using System.Data.Entity;
    using System.Data.Entity.Migrations;
    using System.Linq;
    using Test.Models;

    internal sealed class Configuration : DbMigrationsConfiguration<UserModelContainer>
    {
        public Configuration()
        {
            AutomaticMigrationsEnabled = false;
        }

        protected override void Seed(UserModelContainer context)
        {
            //  This method will be called after migrating to the latest version.

            //  You can use the DbSet<T>.AddOrUpdate() helper extension method 
            //  to avoid creating duplicate seed data. E.g.
            //
            //    context.People.AddOrUpdate(
            //      p => p.FullName,
            //      new Person { FullName = "Andrew Peters" },
            //      new Person { FullName = "Brice Lambson" },
            //      new Person { FullName = "Rowan Miller" }
            //    );
            //
        }
    }
}

Answer 1

The issue turned out to be that I had installed Entity Framework 5.0.0 RC while targeting .NET framework 4.5. Due to deploying to Windows Azure, I found I had to target .NET 4.0 instead. I don’t know the intricacies of NuGet, but it seems that the EF package installed for .NET 4.5 didn’t work properly with my 4.0 targeting project.

After reinstalling the EF NuGet package, while targeting my project at .NET 4.0, everything works well.