EF Type per Hierarchy with Required example

Program.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            var context = new ExampleContext();
            context.BaseClasses.Add(new Snafu() { Whatever = 123 });
            context.BaseClasses.Add(new Foobar() { Whatever = 123 });
            context.SaveChanges();
            foreach (var item in context.BaseClasses.OfType<Snafu>())
            {
                Console.WriteLine(item.Whatever);
            }
            foreach (var item in context.BaseClasses.OfType<Foobar>())
            {
                Console.WriteLine(item.Whatever);
            }
            Console.ReadLine();
        }
    }
    public class ExampleContext : DbContext
    {
        public DbSet<BaseClass> BaseClasses { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<BaseIntermediaryClass>().Property(fb => fb.Whatever).HasColumnName("Whatever");
            base.OnModelCreating(modelBuilder);
        }
    }
    public class BaseClass
    {
        public int Id { get; set; }
    }
    public abstract class BaseIntermediaryClass : BaseClass
    {
        [Required]
        public int Whatever { get; set; }

    }
    public class Foobar : BaseIntermediaryClass
    {
    }

    public class Snafu : BaseIntermediaryClass
    {
    }
}