[StaThread]

[JJ]

Hello NG

I am making a dll. in that dll i set reference to the System.Windows.Forms
to be able to get the OpenFileDialog.
But when I use the :

If ( OFD.ShowDialog() == System.Windows.Forms.DialogResult.OK )

I get the error:
"Current thread must be set to single thread apartment (STA) mode before OLE
calls can be made. Ensure that your Main function has STAThreadAttribute
marked on it. This exception is only raised if a debugger is attached to the
process."

How to prevent this error, and to open the open file dialog.

Kind regards.
Johnny E. Jensen

[Peter Duniho]

On Wed, 15 Oct 2008 23:09:01 -0700, JJ <[e-mail]:

[...]
"Current thread must be set to single thread apartment (STA) mode before
OLE
calls can be made. Ensure that your Main function has STAThreadAttribute
marked on it. This exception is only raised if a debugger is attached to
the
process."

How to prevent this error, and to open the open file dialog.

In the thread that will use the dialog, before you do anything that would
initialize COM (preferably just as the very first thing), call
Thread.SetApartmentState(ApartmentState.STA).

That _should_ allow that thread to safely create and use OpenFileDialog.

Pete