问无法在windows phone 8中设置多个辅助瓷砖

EN

  protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);


            if (!IsolatedStorageSettings.ApplicationSettings.Contains("isolated_image"))
            {
                IsolatedStorageSettings.ApplicationSettings.Add("isolated_image", NavigationContext.QueryString["pro_image"] as string);
            }
![enter image description here][1]
            imageBase = (IsolatedStorageSettings.ApplicationSettings["isolated_image"] as string);

            StreamResourceInfo sri = null;


            Uri uri = new Uri(imageBase, UriKind.Relative);
            uriString = uri.ToString();
            sri = Application.GetResourceStream(uri);
            BitmapImage bitmap = new BitmapImage();
            bitmap.SetSource(sri.Stream);

            base64 = ((App)Application.Current).ImageToBase64(bitmap);

            item_image.Source = ((App)Application.Current).ImageFromBase64(base64);

            if (!(IsolatedStorageSettings.ApplicationSettings.Contains("item_name")))
            {
                IsolatedStorageSettings.ApplicationSettings.Add("item_name", PhoneApplicationService.Current.State["pro_name"]);

            }

            ShellTile secondaryTile = this.FindTile(SecondaryTileUriSource);

            if (secondaryTile != null)
            {

                item_image.Source = ((App)Application.Current).ImageFromBase64(base64);
            }

            txtb_product_name.Text = PhoneApplicationService.Current.State["pro_name"] as string;            

        }

  void btnPin_Click(object sender, EventArgs e)
        {       
            ShellTile tile = this.FindTile(SecondaryTileUriSource);
            if(tile==null)
            {

                StandardTileData tileData = this.GetSecondaryTileData();

                 Uri uri = new Uri("/All Files/Product Files/Dry/Product Detail.xaml?item_image=" + imageBase, UriKind.Relative);

                 MessageBox.Show("the link uri is "+ uri.ToString());

                ShellTile.Create(uri, tileData);


            }
        }