Does reading SelectedIndex on a combo box require an invoke?

[Adam Benson]

Hi,

If you're not on the UI thread - responding to a network event, say - and
you want to read the SelectedIndex of a combo box, do you have to do an
Invoke? Or is it just a simple data read with no windows messages involved?

The reason I ask is that in some of my handlers if the SelectedIndex is -1,
then I can return from the event handler straight away with no need for any
further work. Doing an Invoke just for that seems a bit long-winded.

Ta,

Adam.

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[Marc Gravell]

Perhaps keep a volatile or sync-locked field somewhere, and update it
on the UI thread when the SelectedIndexChanged event fires; then in
your non-UI thread can just check this field, without having to go to
the UI thread.

Marc

[Adam Benson]

Thanks, Marc and Peter.

I suspected as much but wanted to be sure - I'm currently having to work
under VS.NET 2003 so I don't get cross thread exceptions, just a lock up
when you least expect it!

- AB
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