protected override void OnModelCreating(ModelBuilder modelBuilder)

{

   base.OnModelCreating(modelBuilder);

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

}

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);

        }

    }

}

protected override void OnModelCreating(ModelBuilder modelBuilder)

{

   base.OnModelCreating(modelBuilder);

   modelBuilder.ApplyAllConfigurations();

}

protected override void OnModelCreating(ModelBuilder modelBuilder)

{

   base.OnModelCreating(modelBuilder);

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

}