Inheritance for C#?

[eericjacobson]

I think it would be very useful to have inheritance in SpacetimeDB. I know rust doesn't support it but rust supports traits whereas STDB doesn't let you use Interfaces with C#. I dont think it is too difficult to change the generator to also support inheritance. It seems that the only actual issue is that the Read and WriteFields method is being hidden by the derived class.

[Type]
public partial class House : Building
{
    public int PeoplePerHouse;
}

[Type]
public partial class Shed : Building
{
    public int MaxStorage;
}

[Type]
public partial class Building
{
    public DbVector2 GridSize;
    public DbVector2 GridPosition;
    public int GoldCost;
}

How else would you go about implementing a system like this

[Type]
public partial class House
{
    public int PeoplePerHouse;
    public DbVector2 GridSize;
    public DbVector2 GridPosition;
    public int GoldCost;
}

[Type]
public partial class Shed
{
    public int MaxStorage;
    public DbVector2 GridSize;
    public DbVector2 GridPosition;
    public int GoldCost;
}

[Type]
public partial record Building : TaggedEnum<(House House, Shed Shed)>
{
    
}

Without inheritance this gets quite silly.

For example

[Type]
public partial struct ChampionStats
{
    public int Rarity;
    public int Experience;
    public int Happiness;

    public int Level;
    public int CurrentHP;
    public int CurrentSP;
    public int CurrentMP;

    public IntStatWithModifiers MaxHP;
    public IntStatWithModifiers MaxSP;
    public IntStatWithModifiers MaxMP;
    public FloatStatWithModifiers AttackRange;
    public FloatStatWithModifiers AttackSpeed;
    public IntStatWithModifiers AttackDamage;
    public FloatStatWithModifiers BasicAttackRatio;
    public IntStatWithModifiers Defense;
    public IntStatWithModifiers Shield;
}

[Type]
public partial struct EnemyStats
{
    public int Level;
    public int CurrentHP;
    public int CurrentSP;
    public int CurrentMP;

    public IntStatWithModifiers MaxHP;
    public IntStatWithModifiers MaxSP;
    public IntStatWithModifiers MaxMP;
    public FloatStatWithModifiers AttackRange;
    public FloatStatWithModifiers AttackSpeed;
    public IntStatWithModifiers AttackDamage;
    public FloatStatWithModifiers BasicAttackRatio;
    public IntStatWithModifiers Defense;
    public IntStatWithModifiers Shield;
}

Maybe there is a work around i dont know about, but either way Inheritance in STDB for C# would be nice. And interfaces too i guess..