public static FileManagerPhotoPage CreateInstance()
 {
     if (m_instance == null)
     {
         m_instance = new FileManagerPhotoPage();
     }
     return m_instance;
 }
        private void NaviToPhotoView(object sender, EventArgs e)
        {
            // 更改top图标与相关内容
            BitmapImage image = new BitmapImage(new Uri("../Image/icon_iOS_Ads_Remover.png", UriKind.Relative));
            m_iconImg.Source = image;
            m_tbFileName.Text = "Photo";

            if (m_filesManagerPhotoPage == null)
            {
                m_filesManagerPhotoPage = FileManagerPhotoPage.CreateInstance();
            }
            m_mainWidget.Navigate(m_filesManagerPhotoPage);
            m_naviWidget = NaviWidget.FileManagerPhotoPage;

            BackBtn.Visibility = System.Windows.Visibility.Visible;

        }