Writing an application event handler

Question

I am trying to write an unhandled exception event handler as in this question Catching application crash events

But the code as given won't compile, giving the message

error BC30590: Event 'UnhandledException' cannot be found.

How to fix? Do I need to import something (I'm new to VB) - if so then what?

Partial Friend Class MyApplication
    Private Sub MyApplication_UnhandledException(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.UnhandledExceptionEventArgs) Handles Me.UnhandledException
        MsgBox(e.Exception.Message + vbNewLine + e.ToString())
    End Sub
End Class

Did you follow the steps where I said to enable the Application Framework and click the View Application Events button? — Steven Doggart, Dec 05 '13 at 13:13
The `enable application framework` checkbox is checked, and I pasted the code from your answer into `ApplicationEvents.vb` which appeared when I clicked `view application events`. Is that right? — Sideshow Bob, Dec 05 '13 at 13:24
Yes. If that's what you did, it should have worked. Can you please edit your question to show the entire contents of that file? — Steven Doggart, Dec 05 '13 at 13:27
Done. I presume MyApplication is ok - I should't change that (my application as I see it consists of just a single class called Form1) — Sideshow Bob, Dec 05 '13 at 13:30
That's the entire file? That isn't wrapped in a `Namespace My`/`End Namespace` block? — Steven Doggart, Dec 05 '13 at 13:34
Yes. No namespace block. The app functionality sits in form1.vb which contains event handlers for a form. — Sideshow Bob, Dec 05 '13 at 13:44

score 2 · Accepted Answer · answered Dec 05 '13 at 13:37

In order for the MyApplication partial class to work, it must be in the same namespace as the primary MyApplication class. If it's not, that means that you are just creating a whole new MyApplication class which doesn't include that event. To fix your code, make sure that the partial class is in the My namespace, like this:

Namespace My
    Partial Friend Class MyApplication
        Private Sub MyApplication_UnhandledException(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.UnhandledExceptionEventArgs) Handles Me.UnhandledException
            ' ...
        End Sub
    End Class
End Namespace

Writing an application event handler

1 Answers1