C# 如何滚动到wp8中列表框的SelectedIndex

在第一页加载事件中，我无法滚动到列表框的选定索引。当页面第一次加载时，当所选索引被更改并突出显示时，它无法滚动到所选索引。当我导航到另一个页面并返回到此页面时，它会滚动到所选索引。我不明白为什么它不能在第一页加载时滚动

void MainPage_Loaded(object sender, RoutedEventArgs e)
{
    try
    {
      ApplicationBarIconButton btn = (ApplicationBarIconButton)ApplicationBar.Buttons[1];
      if (PlayState.Playing == BackgroundAudioPlayer.Instance.PlayerState)
      {
         btn.IconUri = new Uri("/Images/pause.png", UriKind.Relative);
         BackgroundAudioPlayer player = BackgroundAudioPlayer.Instance;
         if (player.Track != null)
         {
            currentChapter = ds.getChapter(Convert.ToByte(player.Track.Artist.Split(DataSource.TRACKARTISTDELIMTER)[0])); 
            lsbReadingChapter.ItemsSource = ds.getArabicTextWithTranslation(currentChapter);

           //Get Position and Start timer
           fillRecitation();
           double position = player.Position.TotalSeconds;
           setSelectedIndex(position);
           recitationTimer.Start();
         }
      }
      else
      {
         lsbReadingChapter.ItemsSource = ds.getArabicTextWithTranslation(currentChapter);
         recitationTimer.Stop();
         btn.IconUri = new Uri("/Images/play.png", UriKind.Relative);
         scrollIntoSelectedItem(Convert.ToByte(App.Recent.AyaID));

       }

       txtTitle.Text = HCI.convertToArabicIndicString(currentChapter.ChapterID) + " - " + currentChapter.SuraName + " - " + HCI.convertToArabicIndicString(currentChapter.Ayas);

       if (currentChapter != null)
       {
         if (ds.chapterAvailable(currentChapter))
            txtAvailable.Text = "available";
         else
            txtAvailable.Text = string.Empty;
       }

       if (lsbReadingChapter.SelectedIndex != -1)
         scrollIntoSelectedItem(lsbReadingChapter.SelectedIndex); //scroll to index
  }
  catch (Exception) { }
}

void scrollIntoSelectedItem(int index)
{
   lsbReadingChapter.SelectedIndex = lsbReadingChapter.Items.Count - 1;
   lsbReadingChapter.UpdateLayout();
   lsbReadingChapter.ScrollIntoView(lsbReadingChapter.SelectedIndex);

   lsbReadingChapter.SelectedIndex = index;
   lsbReadingChapter.UpdateLayout();
   lsbReadingChapter.ScrollIntoView(lsbReadingChapter.SelectedIndex);

}

this.Page.MaintainScrollPositionOnPostBack = true;

这不仅在第一页加载事件中有效。我不明白是什么原因导致它不能滚动

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谢谢

在页面加载中使用此选项

void MainPage_Loaded(object sender, RoutedEventArgs e)
{
    try
    {
      ApplicationBarIconButton btn = (ApplicationBarIconButton)ApplicationBar.Buttons[1];
      if (PlayState.Playing == BackgroundAudioPlayer.Instance.PlayerState)
      {
         btn.IconUri = new Uri("/Images/pause.png", UriKind.Relative);
         BackgroundAudioPlayer player = BackgroundAudioPlayer.Instance;
         if (player.Track != null)
         {
            currentChapter = ds.getChapter(Convert.ToByte(player.Track.Artist.Split(DataSource.TRACKARTISTDELIMTER)[0])); 
            lsbReadingChapter.ItemsSource = ds.getArabicTextWithTranslation(currentChapter);

           //Get Position and Start timer
           fillRecitation();
           double position = player.Position.TotalSeconds;
           setSelectedIndex(position);
           recitationTimer.Start();
         }
      }
      else
      {
         lsbReadingChapter.ItemsSource = ds.getArabicTextWithTranslation(currentChapter);
         recitationTimer.Stop();
         btn.IconUri = new Uri("/Images/play.png", UriKind.Relative);
         scrollIntoSelectedItem(Convert.ToByte(App.Recent.AyaID));

       }

       txtTitle.Text = HCI.convertToArabicIndicString(currentChapter.ChapterID) + " - " + currentChapter.SuraName + " - " + HCI.convertToArabicIndicString(currentChapter.Ayas);

       if (currentChapter != null)
       {
         if (ds.chapterAvailable(currentChapter))
            txtAvailable.Text = "available";
         else
            txtAvailable.Text = string.Empty;
       }

       if (lsbReadingChapter.SelectedIndex != -1)
         scrollIntoSelectedItem(lsbReadingChapter.SelectedIndex); //scroll to index
  }
  catch (Exception) { }
}

void scrollIntoSelectedItem(int index)
{
   lsbReadingChapter.SelectedIndex = lsbReadingChapter.Items.Count - 1;
   lsbReadingChapter.UpdateLayout();
   lsbReadingChapter.ScrollIntoView(lsbReadingChapter.SelectedIndex);

   lsbReadingChapter.SelectedIndex = index;
   lsbReadingChapter.UpdateLayout();
   lsbReadingChapter.ScrollIntoView(lsbReadingChapter.SelectedIndex);

}

this.Page.MaintainScrollPositionOnPostBack = true;

---

我们在windows phone 8中有这样的属性吗？windows phone 8没有在平台中列出。。。所以可能不是，但肯定有类似的东西。你可以通过document.documentElement.scrollTop填充一个隐藏字段，然后在pageload上滚动到那个位置来解决这个问题。