Handling exceptions globally without try-catch

Question

Handling exceptions globally without try-catch

Cenk 1,041

Hello,

I am working on the Blazor Server application, using NLog to log exceptions into a database table. I wonder if there is a way to catch all exceptions without using try-catch and the connection between the client and server isn't broken when an error occurs and the circuit remains alive.

Thanks in advance.

2 answers

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Answer 1

Sreeju Nair 12,756

When you dont use try - catch and your code throws an exception, this is considered as unhandled exceptions. Refer the following URL to understand how Blazor handles unhandled exceptions.

https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/handle-errors?view=aspnetcore-6.0#blazor-server-unhandled-exceptions

To log the unhandled error, you can pass a custom error component as a cascading value to the child components. Refer the following to understand how you can do the same.

https://learn.microsoft.com/en-us/aspnet/core/blazor/fundamentals/handle-errors?view=aspnetcore-6.0#alternative-global-exception-handling

Hope this helps

Cenk 1,041 Reputation points

2022-10-03T10:53:11.077+00:00

According to the link;

because the approaches in this section handle errors with a try-catch statement, ...
Sreeju Nair 12,756 Reputation points

2022-10-03T11:08:16.053+00:00

See the below part from the documentation about global exception handling.

Answer 2

Cenk 1,041

Sorry but I don't understand how to use.

Anonymous

2022-10-11T06:19:38.467+00:00
Hi @Cenk ,

Do you mean how to use the Alternative global exception handling?

The document is clear, to use the alternative global exception handling, you could follow three steps:

[Note] By using this method, we need to use a try-catch statement.

Add an Error component in the Shared folder, with the following code: since you are using NLog, you can inject the NLog service in this component and log the error.

In the App component, wrap the Router component with the Error component.

In the component which might throw the exception, designate the Error component as a CascadingParameter in the @code block. Call an error processing method in any catch block with an appropriate exception type.

After that, you can see the error in the console windows:

Best regards,
Dillion
Cenk 11 Reputation points

2022-10-11T06:27:12.167+00:00

Thank you @Anonymous but I am looking for handling exceptions globally without using try and catch. Is there any way to do it without try and catch?
Anonymous

2022-10-11T07:35:05.503+00:00

I am looking for handling exceptions globally without using try and catch. Is there any way to do it without try and catch?

Without using the try-catch statement, you could use the ErrorBoundary component, but using this method, you can't log the error/exception to the database. And the SignalR connection will disconnected.

So, to keep the connection connected and log the error/exception to the database, I think you have to use the try-catch statement.

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Handling exceptions globally without try-catch

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