How to properly redirect to the same page in ASP.NET Core Razor Pages?

Question

Here's a simplified code-behind:

[BindProperty(SupportsGet = true)]
public int ProductId { get; set; }

public Product Product { get; set; }

public void OnGet()
{
    Product = ProductService.Get(ProductId)
}

public IActionResult OnPost()
{
   if (!User.Identity.IsAuthenticated)
   {
       retrun Redirect("/login");
   }
   // Add product to user favorite list
   // Then how to redirect properly to the same page?
   // return Redirect("/product") is not working
   // Calling OnGet() does not work
}

And here's the corresponding simplified Razor Page:

@page "/product/{id}"
@model Product

<div>
    @Model.Title
</div>

I'm stuck at properly redirecting user. If I don't return IActionResult then my Redirect("/login") does not work and I get null reference exception for @Model.Title .

If I use IActionResult then my Redirect("/login") works, but after user logins and adds product to favorites, my code on returning user to the same page fails and OneGet does not get called.

Answer 1

In Razor you would use RedirectToPage()

Suppose the class is named IndexModel

public class IndexModel: PageModel
{
    public IActionResult OnPost()
    {
       if (!User.Identity.IsAuthenticated)
       {
           return Redirect("/login");
       }
       // Add product to user favorite list
       // Then how to redirect properly to the same page?
       // return Redirect("/product") is not working
       // Calling OnGet() does not work

       return RedirectToPage("Index");
   }
}

note: you misspelled return . Is says retrun in you code

update You want to follow the PRG model: after a P ost you R edirect to a G et

to pass parameters back to the OnGet action doe this:

public void OnGet(int productId)
{
    Product = ProductService.Get(productId)
}

and in your view:

@page "/product/{productId}"

and in the OnPost

return RedirectToPage("Index", new { productId = ProductId});