Ogoun Er

<PropertyGroup>
...
    <RuntimeIdentifiers>win10-x64</RuntimeIdentifiers>
...
  </PropertyGroup>

public interface IRepository<T>
where T: IEntity
{
    T Get(Guid Id);
    void Post(T entity);
    void Remove(Guid id);
}

public class EFRepository<T>: IRepository<T>
where T: IEntity
{
/*Логика для EF*/
}

public abstract class Product
    {
        public int ProductId { get; set; }
        public string Name { get; set; }

        public abstract int GetShopPrice(City city);
    }

    public sealed class SimpleProduct : Product
    {
        public override int GetShopPrice(City city)
        {
            //логика
        }
    }
    public sealed class ModuleProduct : Product
    {
        public override int GetShopPrice(City city)
        {
            //логика
        }
    }