Question on HandleDestroyed event

[Guest]

Hey guys.

Under what circumstances is HandleDestroyed called? Is it only called when
a control is being Disposed?

I sometimes get the following exception in my app:

UnhandledThreadException, Exception='System.NullReferenceException: Object
reference not set to an instance of an object.
at System.Windows.Forms.ListViewItemCollection.get_Item(Int32 displayIndex)
at System.Windows.Forms.ListView.OnHandleDestroyed(EventArgs e)
at System.Windows.Forms.Control.WmDestroy(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ListView.WndProc(Message& m)
at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg,
IntPtr wparam, IntPtr lparam)'

Has anyone seen this before or have any ideas on how I can debug it? It
happens randomly and rarely so I can't reproduce it.


One other question.

According to the stack trace, it seems that one of the items in the listview
is null.

Can someone give me an exmaple of how I can get a null value in the
listview's item collection in the first place?

Trying to add "null" directly throws its own exception and I can't figure
out how to add a non-null value and then somehow get it to be null.

Anyone have a short example of that happening?

Thanks a lot

 

[chanmm]

It looks like you have not instantiated the ListView properly. Check your
code or you want to paste some here perhaps.

chanmm