Unhandled Application Exceptions Sample

This sample demonstrates how to handle DispatcherUnhandledException to process recoverable and unrecoverable unhandled application exceptions. Building the Sample Install the Windows Software Development Kit (SDK) and open its build environment command window.

 
 
 
 
 
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2/1/2011
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Imports System.Windows.Threading

Public Class App
    Inherits Application

    Private Sub App_DispatcherUnhandledException(ByVal sender As Object, ByVal e As DispatcherUnhandledExceptionEventArgs)

        ' Process unhandled exception
        Dim shutdown As Boolean = False

        ' Process exception
        If TypeOf e.Exception Is DivideByZeroException Then
            ' Recoverable - continue processing
            shutdown = False
        ElseIf TypeOf e.Exception Is ArgumentNullException Then
            ' Unrecoverable - end processing
            shutdown = True
        End If

        If shutdown Then

            ' If unrecoverable, attempt to save data
            Dim result As MessageBoxResult = MessageBox.Show(("Application must exit:" & ChrW(10) & ChrW(10) & e.Exception.Message & ChrW(10) & ChrW(10) & "Save before exit?"), "app", MessageBoxButton.YesNo, MessageBoxImage.Hand)
            If (result = MessageBoxResult.Yes) Then
                ' Save data
            End If

            ' Add entry to event log
            EventLog.WriteEntry("app", ("Unrecoverable Exception: " & e.Exception.Message), EventLogEntryType.Error)

            ' Return exit code
            MyBase.Shutdown(-1)

        End If

        ' Prevent default unhandled exception processing
        e.Handled = True

    End Sub

End Class