There are certain set of keywords ASP.NET Core MVC uses internally, which should be avoided in user-code as it can result in unexpected outcome in certain scenarios.

• The names controller, action, area, and page are reserved keywords used by MVC's routing system. Using these as part of link generations, or as model bound parameters or top level properties will likely bind the reserved route value.

Consider

// /ListProducts/Index.cshtml
@page "{page:int?}"

@functions {
   public async Task OnGetAsync(int page)
   {
        ...
    }

The parameter page on the page handler will not be bound correctly since page is a reserved keyword.

• The following keywords are reserved in the context of a Razor view or a Razor Page:
  • page
  • using
  • namespace
  • inject
  • section
  • inherits
  • model
  • addTagHelper
  • removeTagHelper