modelBuilder.Configurations.AddFromAssembly in EF Core

Question

In EntityFramework 6.x, if we have lots of EntityConfiguration classes then we can assign all of them in OnModelCreating(ModelBuilder modelBuilder) as follows instead of one by one:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
   base.OnModelCreating(modelBuilder);

   modelBuilder.Configurations.AddFromAssembly(typeof(MyDbContext).Assembly);
}

Is there anything like modelBuilder.Configurations.AddFromAssembly in Entity Framework Core.

Answer 1

For EF Core <= 2.1

You can write an extension method as follows:

public static class ModelBuilderExtensions
{
    public static void ApplyAllConfigurations(this ModelBuilder modelBuilder)
    {
        var typesToRegister = Assembly.GetExecutingAssembly().GetTypes().Where(t => t.GetInterfaces()
            .Any(gi => gi.IsGenericType && gi.GetGenericTypeDefinition() == typeof(IEntityTypeConfiguration<>))).ToList();

        foreach (var type in typesToRegister)
        {
            dynamic configurationInstance = Activator.CreateInstance(type);
            modelBuilder.ApplyConfiguration(configurationInstance);
        }
    }
}

Then in the OnModelCreating as follows:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
   base.OnModelCreating(modelBuilder);

   modelBuilder.ApplyAllConfigurations();
}

For EF Core >= 2.2

From EF Core 2.2 you don't need to write any custom extension method. EF Core 2.2 added ApplyConfigurationsFromAssembly extension method for this purpose. You can just use it as follows:

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
   base.OnModelCreating(modelBuilder);

   modelBuilder.ApplyConfigurationsFromAssembly(typeof(UserConfiguration).Assembly); // Here UseConfiguration is any IEntityTypeConfiguration
}

Thank you.