Test for https://stackoverflow.com/questions/52310533/ef-core-code-first-abstract-class-defined-in-context-but-still-not-able-to-cre

DataContext.cs

using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Console;

namespace test
{
    public abstract class EntityBase
    {
        public int Id { get; set; }
        public byte[] RowVersion { get; set; }
    }

    public abstract class ParentUnit : EntityBase
    {
        public string Name { get; set; }
    }

    public class ChildArea1 : ParentUnit
    {
        public string Description { get; set; }
    }

    public class ChildArea2 : ParentUnit
    {
        public string AreaCode { get; set; }
    }

    class DataContext : DbContext
    {
        static readonly LoggerFactory loggerFactory = new LoggerFactory(new[] {
            new ConsoleLoggerProvider((_, level) => level >= LogLevel.Information, true)
        });

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseLoggerFactory(loggerFactory);
            optionsBuilder.UseSqlite("FileName=data.db");
            base.OnConfiguring(optionsBuilder);
        }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            builder.Entity<ParentUnit>().Property(x => x.Name).IsRequired();

            // Rowversion is defined on EntityBase and inherited by all children
            builder.Entity<ChildArea1>().Property(x => x.RowVersion).IsRowVersion();

            builder.Entity<ChildArea2>().Property(x => x.RowVersion).IsRowVersion();
            builder.Entity<ChildArea2>().Property(x => x.AreaCode).IsRequired();

            base.OnModelCreating(builder);
        }

        public DbSet<ParentUnit> ParentUnit { get; set; }
        public DbSet<ChildArea1> ChildArea1 { get; set; }
        public DbSet<ChildArea2> ChildArea2 { get; set; }
    }
}

Program.cs

using System;

namespace test
{
    class Program
    {
        static void Main(string[] args)
        {
            using (var ctx = new DataContext())
            {
                ctx.Database.EnsureDeleted();
                ctx.Database.EnsureCreated();

                ctx.ChildArea1.Add(new ChildArea1 { Name = "Area", Description = "desc" });
                ctx.ChildArea2.Add(new ChildArea2 { Name = "Area", AreaCode = "1" });

                ctx.SaveChanges();
            }

            using (var ctx = new DataContext())
            {
                foreach (var unit in ctx.ParentUnit)
                    Console.WriteLine($"Id = {unit.Id}, Type = {unit.GetType().Name}");
            }
        }
    }
}