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asp.net-corerazorrazor-pagescustom-error-pagescustom-error-handling

Razorpages - Custom 500 Error Page Not Displaying Even though 403 and 404 pages do

I am trying to implement the following custom error pages in ASP.NET Razor Pages (.Net 8.0):

  • 403 Forbidden
  • 404 Not Found
  • 500 Server Error

My error pages are RazorPages pages within a directory called Error with the Pages directory. The Model code behind only has an empty constructor.

Error Pages

The application configuration is as below:

Application configuration

With the supplementary method as below to allow the 403 to be shown when the context is not fully started. Without this the standard ASPNet 403 page would show for non authorised page requests.

Supplementary method

The order of setup, which I understand is critical, is what I have gleaned from MSDN and various Stack Overflow posts and solutions.

The 403 and 404 pages redirect and display PERFECTLY. The 500 page will not, no matter what I have tried from various Stack Overflow "Accepted" solutions. I just get the standard ASP.Net 500 page.

EDIT 1:

  • I am using ASPNetCore.App 8.0.11
  • The 500 error is triggered by throwing a new NotImplementedException() in the OnGetAsync() action in the page code behind.
  • I have the app.Environment.IsDevelopment switch disabled so it would UseExceptionHandler("/Error"); instead of the DeveloperExceptionPage.

EDIT 2:

Brando suggested that I use app.UseExceptionHandler("/Error/500"); instead of app.UseExceptionHandler("/Error"); which I tried as below...

            //if (app.Environment.IsDevelopment())
            //{
            //    app.UseDeveloperExceptionPage();
            //}
            //else
            //{
                //app.UseExceptionHandler("/Error");
                app.UseExceptionHandler("/Error/500");
                app.UseHsts();
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
            //}

...however, I am still not hitting my custom error page.

enter image description here

Is there something else I am missing?

Edit 3:

TLDR; The fix Brando suggested DID FIX the issue. Thank you Brando.

DETAIL; I realised I had a random app.UseDeveloperExceptionPage(); still at the bottom of my WebApplicationConfiguration.cs. Once this was removed, swicthing between my original code and Brando's code could introduce / fix the bug as Brando stated. Brando's suggestion fixed the issue.

Any help appreciated.

Solution

  • According to your codes, I still find you are using the previous error path inside the UseExceptionHandler method, but the 500 page's path should be error/500

    I suggest you could try this to test if this will use the new error page:

    app.UseExceptionHandler("/Error/500");

    Result:

    Path:

    enter image description here

    enter image description here