Question

please look at the code below.

class Program
{
    static void Main(string[] args)
    {
        using (myContext context = new myContext())
        {
            Team t = new Team();
            t.id = 1;
            t.Name = "asd";
            context.teamSet.Add(t);
            context.SaveChanges();
        }
    }
}

public abstract class Base
{
    public virtual int id { get; set; }
}

public abstract class Player : Base
{
    public virtual string Name { get; set; }
    public virtual int Number { get; set; }
    public virtual Team team { get; set; }
    [ForeignKey("team")]
    public int teamId { get; set; }
}

public class Team : Base
{
    public ICollection<Player> Players { get; set; }
    public string Name { get; set; }
}

public class FootballPlayer : Player
{
    public double Speed { get; set; }
}

public class BasketballPlayer : Player
{
    public double Height { get; set; }
    public double Speed { get; set; }
}

public class myContext : DbContext
{
    public DbSet<Player> playerSet { get; set; }
    public DbSet<Team> teamSet { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Configurations.Add(new BaseConfiguration()).Add(new PlayerConfiguration()).Add(new TeamConfiguration()).Add(new FootballConfiguration()).Add(new BasketballConfiguration());           
    }
}

public class BaseConfiguration : EntityTypeConfiguration<Base>
{
    public BaseConfiguration()
    {
        HasKey(k => k.id);
        Property(p => p.id).IsRequired().HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
    }
}

public class PlayerConfiguration : EntityTypeConfiguration<Player>
{ 
    public PlayerConfiguration()
    {
        Map(p=>{
            p.MapInheritedProperties();
        p.ToTable("Player");
        });
    }
}

public class TeamConfiguration : EntityTypeConfiguration<Team>
{
    public TeamConfiguration()
    {
        Map(p =>
        {
            p.MapInheritedProperties();
            p.ToTable("Team");
        });
    }
}

public class FootballConfiguration : EntityTypeConfiguration<FootballPlayer>
{
    public FootballConfiguration()
    {
        ToTable("FootballPlayer");
    }
}

public class BasketballConfiguration : EntityTypeConfiguration<BasketballPlayer>
{
    public BasketballConfiguration()
    {
        ToTable("BasketballPlayer");
    }
}

My Player class and Team Class are derived from Based Class, and FootballPlayer and BasketballPlayer are derived from Player. But in the generated database, Player table doesn’t contain a FK teamId, it is only a common property. Furthermore, the FootballPlayer and BasketballPlayer tables don’t contains the properties which derived from Player class. Anyone can help?

Answer 1

What inheritance mapping are you trying to achieve? At the moment you have TPC between Base and Player and TPT between Player and its derived types. If you want to have inherited properties in those derived types you must use TPC as well but in such case there should be no Player table in your database. To use TPC for player you must use MapInheritedProperties in their mapping configurations.