public static string ChooseOpenFile(ExtensionFilter filter)
{
FileDialog dialog = InitializeDialog(new OpenFileDialog(), filter);
bool? result = dialog.ShowDialog();
return(result.Value ? dialog.FileName : null);
}
private static FileDialog InitializeDialog(FileDialog dialog, ExtensionFilter filter, int filterIndex = 1)
{
if (dialog == null)
{
throw new ArgumentNullException(nameof(dialog));
}
dialog.Filter = filter.FilterString;
dialog.FilterIndex = filterIndex;
return(dialog);
}
