Shadow state with seeding data and EF Core

MenusContext.cs

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
    // shadow state
    modelBuilder.Entity<MenuItem>().Property<DateTime>(LastUpdated);

    modelBuilder.Entity<MenuItem>().Property(m => m.Text).IsRequired().HasMaxLength(40);

    // use anonymous types to pass shadow state information
    modelBuilder.Entity<MenuItem>().HasData(
        new { MenuItemId = 1, Text = "Wiener Schnitzel mit Kartoffelsalat", MenuDate = new DateTime(2018, 8, 27), LastUpdated = DateTime.Now },
        new { MenuItemId = 2, Text = "Faschierter Braten mit Karoffelpüree", MenuDate = new DateTime(2018, 8, 28), LastUpdated = DateTime.Now });
}