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Not working with Blazor application

See original GitHub issue

I configured the Blazor app that comes with .NET CORE 3.0 in VS2019, but no log is generated 😦

Added in Counter.razor page:

@code {
    int currentCount = 0;

    void IncrementCount()
        throw new InvalidOperationException("Test");

Issue Analytics

  • State:open
  • Created 4 years ago
  • Comments:5 (2 by maintainers)

github_iconTop GitHub Comments

conficientcommented, Sep 1, 2022

Had a quick look at this again. The new <ErrorBoundary> component in .NET 6 can be useful here. It normally is used to wrap components that might have issues on a page, but it’s possible (but not advisable?) to wrap the whole App in one.

The component itself does not allow intercepting the error to log it, but you can create a subclass which can:

    public class GlobalErrorHandler : ErrorBoundary
        protected override Task OnErrorAsync(Exception exception)
            // log to ELMAH here
            return base.OnErrorAsync(exception);

You would then wrap the router in the App.razor in this:

        <Router AppAssembly="@typeof(App).Assembly">
            <Found Context="routeData">
                <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
                <FocusOnNavigate RouteData="@routeData" Selector="h1" />
                <PageTitle>Not found</PageTitle>
                <LayoutView Layout="@typeof(MainLayout)">
                    <p role="alert">Sorry, there's nothing at this address.</p>
        <p>Sorry an error occurred</p>

Worth experimenting with but there may be issues with this approach I’ve not considered.

skcsknathan001commented, Aug 31, 2022

Elmah logs unhandled server errors. If you already do try/catch, it won’t. However, you can log manually in your catch block like ElmahExtensions.RaiseError(ex);

Read more comments on GitHub >

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