Catching every unhandled exception?

[Elp]

Hi,

I've developped a Window Form C# application which main form contains
several activex controls. No problems most of the time but on some machine,
the application crashes when the main form is closed with a
NullReferenceException caused by the DisposeAxControl which, i guess, is
supposed to dispose one of my ActiveX.

This is not a big problem as the application is closing anyway but i'd like
to suppress this crash message. However, i can't find a way to catch this
exception in my application. Even when putting the whole main method in a
try catch block, this exception is not catched! How can i catch all
unhandeled exceptions in an application?

 

[Stoitcho Goutsev \(100\) [C# MVP]]

Hi Elp,
To catch Windows Form's unhandled exception hook-up
AppDomain.UnhandledException and Application.ThreadException events

 

[Jay B. Harlow [MVP - Outlook]]

Elp,
In addition to the other comments.

Depending on the type of application you are creating, .NET has three
different global exception handlers.

For ASP.NET look at:
System.Web.HttpApplication.Error event
Normally placed in your Global.asax file.

For console applications look at:
System.AppDomain.UnhandledException event
Use AddHandler in your Sub Main.

For Windows Forms look at:
System.Windows.Forms.Application.ThreadException event
Use AddHandler in your Sub Main.

It can be beneficial to combine the above global handlers in your app, as
well as wrap your Sub Main in a try catch itself.

There is an article in the June 2004 MSDN Magazine that shows how to
implement the global exception handling in .NET that explains why & when you
use multiple of the above handlers...

http://msdn.microsoft.com/msdnmag/issues/04/06/NET/default.aspx

For example: In my Windows Forms apps I would have a handler attached to the
Application.ThreadException event, plus a Try/Catch in my Main. The
Try/Catch in Main only catches exceptions if the constructor of the MainForm
raises an exception, the Application.ThreadException handler will catch all
uncaught exceptions from any form/control event handlers.

Hope this helps
Jay

 

[Elp]

Hi Elp,
To catch Windows Form's unhandled exception hook-up
AppDomain.UnhandledException and Application.ThreadException events

Thanks to both of you. I think that it is what i was looking for. I'll give
it a try.