Dynamically loading DbSet to DbContext

How do I dynamically load into an EF7 DbContext a X number of classes without explicitly writing them in a DbContext class ?

For example, I tried to avoid it like this:

public class MyDbContextClass : DbContext
{
    public DbSet<Category> categories {get;set;}
    public DbSet<Product> products {get;set;}
    ...
}

So it could be great to load Category and Product dynamically (without knowing if I have 2 or 20 classes).

Is it possible?