Best way to get a specific menu item and all descendants

Hi,

I have a site menu structure that looks something like this –

• Menu root
  • Sub menu 1 (MenuPage type)
  • Sub menu 2 (MenuPage type)
    • Another sub 1 (SubMenuPage type)
    • Another sub 2 (SubMenuPage type)
  • Sub menu 3

Each menu item contains a page reference to a page in the page tree.

I’m trying find the best way to retrieve the descendants for Sub menu 2.

I discovered I can get the items like so – 

var ContentModelUsage = ServiceLocator.Current.GetInstance<IContentModelUsage>();
var ContentTypeRepository = ServiceLocator.Current.GetInstance<IContentTypeRepository>();
var ContentType = ContentTypeRepository.Load<MenuPage>();
var Usages = ContentModelUsage.ListContentOfContentType(ContentType).Where(x => x.Name == "Sub menu 2");
var subMenus = _contentLoader.GetChildren<SubMenuPage>(Usages.FirstOrDefault().ContentLink).Where(x => x.Status == VersionStatus.Published && x.VisibleInMenu == true);

However, I wanted to see if there is a better way that I could find these items rather than directly querying the parent menu item by Name – as this could be changed in the CMS and then the above code would break. 

The pages where I would like to use these results would be descendants of the page referenced in Sub Menu 2 (so wondered if there was any clever way here of getting at the information).

Many thanks,
Jon.