Ancestor or self ot template

in Repository

public IConferenceHero GetHero()
        {
            var currentItem = RenderingContext.Current.Rendering.Item;
            if (currentItem == null || !currentItem.IsDerived(Templates.ConferenceHero.ID))
                return null;

            IConference glassConfItem = _context.Cast<IConference>(currentItem?.GetAncestorOrSelfOfTemplate(Templates.Conference.ID));
            IConferenceHero result = _context.Cast<IConferenceHero>(currentItem);
            result.DisplayRegistrationButton = (DateTime.Today.Date > glassConfItem.LastRegistrationDate && (_registrationModel != null && !_registrationModel.IsPaid)) ? false : true;

            return result;
        }




in Extensions:

public static Item GetAncestorOrSelfOfTemplate(this Item item, ID templateID)
        {
            if (item == null)
            {
                throw new ArgumentNullException(nameof(item));
            }

            return item.IsDerived(templateID) ? item : item.Axes.GetAncestors().LastOrDefault(i => i.IsDerived(templateID));
        }