How to catch the exception from middleware in Razor page app?

[zbx888]

I have intranet.net core razor app with default exception handling setting as follows: if (!app.Environment.IsDevelopment()) { app.UseExceptionHandler("/Error"); app.UseHsts(); }

I have one custom middleware to deal with Windows Authentication with Identity membership and check the user id application user. If not the application user, app throws one exception as follows:

if (user != null)
{
await signInManager.SignInAsync(user, true);
context.User = await signInManager.CreateUserPrincipalAsync(user);
_logger.LogInformation($"User with id {user.Id}, name {user.UserName} successfully signed in");

// Workaround
context.Items["IntranetUser"] = user;
}
else
{
_logger.LogInformation($"User cannot be found in identity store.");
throw new System.InvalidOperationException($"user not found.");
}

In production, the exception is never catched instead of 500 error. How to solve this issue? Thanks!

 

[cjard]

Please put your code in [CODE] tags

 

[Skydiver]

Did you verify that routing to "/Error" actually successfully shows a page? Perhaps the error 500 is due to the failure to find such a path within your app.

 

[zbx888]

Did you verify that routing to "/Error" actually successfully shows a page? Perhaps the error 500 is due to the failure to find such a path within your app.

Thank you for your response. In Program.cs, system triggers the error app.UseExceptionHandler("/Error"); under production evniroment but never goes to Error page. What is wrong?

 

[Skydiver]

Do you know that the error page works?

 

[Skydiver]

In Program.cs, system triggers the error app.UseExceptionHandler("/Error"); under production evniroment

On re-reading this, are you saying that making this call itself causes the error -- in your words: "triggers the error"? If so then of course the error page won't be shown because the act of trying to setup the error handler page failed.