private async void CommandBinding_PageUp_Executed(object sender, ExecutedRoutedEventArgs e)
{
ChapIndex--;
_chapid = bookdir.Volumelists[VolumeIndex].Chapterlist[ChapIndex].ChapId;
await ReLoad();
ChatUserControl.ScrollToHome();
}
private async void CommandBinding_OpenDirDialog_Executed(object sender, ExecutedRoutedEventArgs e)
{
DirChoosePage dialog = new DirChoosePage(bookdir, _volumeid, _chapid);
NavigationService.Navigate(dialog);
await ReLoad();
ChatUserControl.ScrollToHome();
}