How to implement generic GetById() where Id can be of various types

Question

I am trying to implement a generic GetById(T id) method which will cater for types which may have differing ID types. In my example, I have an entity which has

Answer 1

You should remove the constraint on TId from your Repository class

public abstract class Repository : IRepository
where TEntity : class, IEntity
{
    public virtual TEntity GetById(TId id)
    {
        return context.Set().Find(id);
    }
}