Blazor server - catch all exceptions globally like in Global.asax

[Matej Stare]

Is it possible to catch all errors in Blazor Server like in MVC 5 in global.asax on Application_Error and send an email to application administrator?

thank you,

MAtej

[Matthias]

Hi,
you can use "ErrorBoundary" since .net 6.
Here is an example which catches the errors of all components and then displays an error message. Alternatively you can also send a mail. The benefit of this is, that in case of an error not the whole application stops, but only the affected component. 

 

<ErrorBoundary @ref="@_errorBoundary">
                    <ChildContent>
                        <div class="content">
                            @Body
                        </div>
                    </ChildContent>
                    <ErrorContent Context="ex">
                        @if (HandleError(@ex))
                        {
                            <div class="container-error">
                                <div class="error-text">
                                    @ex.Message
                                </div>
                                <div class="error-text-small">
                                    @ex.StackTrace
                                </div>
                            </div>
                        }
                    </ErrorContent>
                </ErrorBoundary>

private ErrorBoundary _errorBoundary;

bool HandleError(Exception ex)
    {
      
            var msg = ex.Message;
            var trace = ex.StackTrace;
// SEND MAIL TO ADMIN
            return true;
        
    }

This affects all components - if every error in the C# code should be caught globally, I would advise against managing this globally. For this I use try-catch blocks, which optionally log or send a mail in case of an error. With appropriate tests this should happen but rather rarely. 

Regards Matthias

[Matej Stare]

Matthias, thank you