Question

This is probably some stupid oversight, but here it goes:

public class Entity<TId> where TId : IEquatable<TId>
{
    public virtual TId Id { get; private set; }
}

public class Client : Entity<Guid> { }
public class State : Entity<short> { }


public class Helper
{
    protected IList<Client> clients;
    protected IList<State> states;

    //Works
    public T Get<T>()
    {
        return default(T);
    }

    public T Get<T>(Guid id) where T : Entity<Guid>
    {
        return default(T);
    }

    public T Get<T>(short id) where T : Entity<short>
    {
        return default(T);

    }
}

How the heck do I write the Get function that will work with both of the classes? And with every other that inherits from Entity?

I just hope I don’t get too many downvotes.
🙁

Edit

This is where it’ll be used. So it won’t be just two classes. But basically all the classes on my model.

    //What should I declare here?
    {
        TEntity result = default(TEntity);
        try
        {
            using (var tx = session.BeginTransaction())
            {
                result = session.Query<TEntity>().Where(e => e.Id == Id).FirstOrDefault();
            }
            return result;
        }
        catch (Exception ex)
        {

            throw;
        }
    }

With the solution given by SWeko

public TEntity Get<TEntity, TId>(TId Id)
            where TEntity : Entity<TId>
            where TId : IEquatable<TId>
        {
            try
            {
                TEntity result = default(TEntity);
                using (var tx = statefullSession.BeginTransaction())
                {
                    result = statefullSession.Query<TEntity>().Where(e => e.Id.Equals(Id)).FirstOrDefault();
                }
                return result; 
            }
            catch (Exception ex)
            {
                throw;
            }
        }

Answer 1

If the issue is just what to put in the where clause of the Get method, you could do:

public TEntity Get<TEntity, TId> (TId id) where TEntity : Entity<TId>
                                          where TId : IEquatable<TId>
{
  .....
}