OpenFileDialog.showDialog hangs on Vista

OpenFileDialog began hanging when called directly from some of my code. (I'm dealing with C# 2.0 here.)

Turns out it doesn't run in it's own thread, but takes over your main thread. Vista just isn't a big fan of this. To get around it you need to invoke OpenFileDialog from within another thread. I stumbled upon this code that will work nice any time you need to popup another dialog window (such as a process indicator or built in ones like OpenFileDialog). Hopefully our pals over in Redmond fix up OpenFileDialog to just do this by default in the future.

I stumbled upon this code out in the blogosphere (https://forums.microsoft.com) awhile ago.

public class Invoker
{
public OpenFileDialog InvokeDialog;
private Thread InvokeThread;
private DialogResult InvokeResult;

public Invoker()
{
InvokeDialog = new OpenFileDialog();
InvokeThread = new Thread(new ThreadStart(InvokeMethod));
InvokeThread.SetApartmentState(ApartmentState.STA);
InvokeResult = DialogResult.None;
}

public DialogResult Invoke()
{
InvokeThread.Start();
InvokeThread.Join();
return InvokeResult;
}

private void InvokeMethod()
{
InvokeResult = InvokeDialog.ShowDialog();
}
}

Usage :

Invoker I = new Invoker();

if (I.Invoke() == DialogResult.OK)
{
MessageBox.Show(I.InvokeDialog.FileName, "Test Successful.");
}
else
{
MessageBox.Show("Test Failed.");
}