asked on

An unhandled exception of type 'System.NullReferenceException' occurred in system.windows.forms.dll

Hi can u help me please i get the following error msg:

An unhandled exception of type 'System.NullReferenceException' occurred in system.windows.forms.dll

when the follwoing code is executed : Catch When Not System.Diagnostics.Debugger.IsAttached

Can anybody help ????

#If DEBUG Then
Catch When Not System.Diagnostics.Debugger.IsAttached
#Else
catch
#End If

'Just re-throw here, exception handled by BaseApplication
Throw

Finally

'Log end of application
BaseApplication.goError.Log("SESSION FINISHED", [Error].SeverityLevel.Information)
'Stop base application
BaseApplication.Stop()

End Try

Else

Bob Learned

Sounds like a bug to me.

Bob

Bob Learned

This is the resulting call from the framework (pretty simple):

<MethodImpl(MethodImplOptions.InternalCall)> _
Private Shared Function IsDebuggerAttached() As Boolean
End Function

Bob

anwarmir

ASKER

Sorry But i a have just started VB.net...can someone explain a bit further.
Any tips on how i can resolve the problem.

Bob Learned

What are you trying to do?

Bob

anwarmir

ASKER

I have started supporting a new system the code has already benn written.

It appears that the exception is being thrown by the following function, on the first line of the code:

obj Is Nothing Or Not Me.GetType Is obj.GetType

Public Overloads Overrides Function Equals(ByVal obj As Object) As Boolean
If obj Is Nothing Or Not Me.GetType Is obj.GetType Then
Return False
End If
Dim order As ViewedOrder = CType(obj, ViewedOrder)
Return order.Id = Me.Id And order.Customer = Me.Customer
End Function

Is there any way i can put some saftey checks in the Function so that the exception is not thrown

Thanks

Bob Learned

Why are you trying to avoid the exception? It could be possible to "hide" an exception that you need to see that way.

Bob

anwarmir

ASKER

The thing is the exception in this function appears to crash the whole application. Is there any way round this?
I know i am not giving you much to go on...but ia m still in the early days of struggling to understand the application.
Thanks

ASKER CERTIFIED SOLUTION

Bob Learned

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anwarmir

ASKER

Thanks....This seems to work.
Appreciate your help on this one.
Cheers