public static DialogResult ShowFolderDialog(this OpenFileDialog ofd, IntPtr hWndOwner)
{
if (Environment.OSVersion.Version.Major < 6)
{
throw new NotSupportedException();
}
var oldVal = ofd.CheckFileExists;
if (oldVal == true)
{
ofd.CheckFileExists = false;
}
//System.Windows.Forms.FileDialog::RunDialogVista(IntPtr hWndOwner)
/*IFileDialog*/ var dialog = ofd.CreateVistaDialog();
ofd.OnBeforeVistaDialog(dialog);
/*VistaDialogEvents*/ var events = new_VistaDialogEvents(ofd);
dialog.SetOptions(ofd.GetOptions() | 32U); /*FOS_PICKFOLDERS*/
dialog.Advise(events, out uint id);
try {
return(Show(dialog, hWndOwner));
} finally {
dialog.Unadvise(id);
GC.KeepAlive(events);
if (oldVal == true)
{
ofd.CheckFileExists = true;
}
}
}
