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Page Model Basics
Review

Well done! We’ve covered a lot of page model concepts. Let’s review:

  • When a GET request is made to a page, the OnGet() or OnGetAsync() method from its page model is invoked.
  • When a POST request is made to a page, the OnPost() or OnPostAsync() method from its page model is invoked.
  • URL query string values can be accessed via a method’s parameters.
  • URL query string values can also be accessed via model binding, which is activated using [BindProperty].
  • The asp-for attribute in Input Tag Helpers connects an <input> element to a model property.
  • The asp-route-{value} attribute in Anchor Tag Helpers adds additional information to a link.
  • Synchronous handler methods, like OnGet() and OnPost(), with no return statement will have a return type of void.
  • Asynchronous handler methods, like OnGetAsync() and OnPostAsync(), with no return statement will have a return type of Task.

If you’d like to see other examples of handler methods, look at the first few sections of this introduction to Razor Pages by Microsoft and check out the Handler Methods section on Learn Razor Pages.

Instructions

Before you move on, make sure you can answer the following questions. You can poke around the app code for hints:

  • When are OnGet() and OnPost() called?
  • Within an Input Tag Helper what does the asp-for attribute do?
  • How is [BindProperty] used?
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