title: Razor Pages - Call method from base class after all OnGet handlers
body: <p>I've got a base class (called BmsPageModel) that inherits from PageModel. There's a method in the BmsPageModel that I need to call on every page so a menu can be populated correctly based on permissions.</p>
  
  <p>How can I make every page that inherits from my base class call this method during/after every OnGet handler without typing it by hand in every page?</p>