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I've also made some further research - that if you reenter the page with LLS everything is updated correct - Visual tree has that many elements like collection. I've modified an example (<a href="http://sdrv.ms/169kRqI" rel="nofollow">http://sdrv.ms/169kRqI</a> ): Let's make Main_Page the second_page: Xaml: <pre><code><phone:PhoneApplicationPage.Resources> <DataTemplate x:Key="ElementStyle"> <TextBlock x:Name="elemBlck" Text="Element"/> </DataTemplate> </phone:PhoneApplicationPage.Resources> <Grid x:Name="LayoutRoot" Background="Transparent"> <Grid.RowDefinitions> <RowDefinition Height="30*"/> <RowDefinition Height="30*"/> <RowDefinition Height="30*"/> </Grid.RowDefinitions> <Grid.ColumnDefinitions> <ColumnDefinition Width="70*"/> <ColumnDefinition Width="30*"/> </Grid.ColumnDefinitions> <Button x:Name="addBtn" Content="Add" Grid.Row="0" Grid.Column="1"/> <Button x:Name="delBtn" Content="Del" Grid.Row="1" Grid.Column="1"/> <Button x:Name="showBtn" Content="Show" Grid.Row="2" Grid.Column="1"/> <phone:LongListSelector x:Name="phoneLLS" HorizontalAlignment="Left" Height="700" Margin="0" Grid.Row="0" VerticalAlignment="Top" Grid.RowSpan="3" Grid.Column="0" Width="300" LayoutMode="Grid" GridCellSize="300,100" IsGroupingEnabled="False" ItemTemplate="{StaticResource ElementStyle}" ItemsSource="{Binding}"/> </Grid> </code></pre> code behind: <pre><code>public partial class second_page : PhoneApplicationPage { public second_page() { InitializeComponent(); phoneLLS.DataContext = MainPage.collection; addBtn.Click += addBtn_Click; delBtn.Click += delBtn_Click; showBtn.Click += showBtn_Click; } private void addBtn_Click(object sender, RoutedEventArgs e) { MainPage.collection.Add("element"); } private void delBtn_Click(object sender, RoutedEventArgs e) { MainPage.collection.RemoveAt(MainPage.collection.Count - 1); } private void showBtn_Click(object sender, RoutedEventArgs e) { List<TextBlock> controlList = new List<TextBlock>(); SearchForControls<TextBlock>(phoneLLS, ref controlList); } private static void SearchForControls<T>(DependencyObject parent, ref List<T> controlList) where T : DependencyObject { int numberOfChildreen = VisualTreeHelper.GetChildrenCount(parent); for (int i = 0; i < numberOfChildreen; i++) { var child = VisualTreeHelper.GetChild(parent, i); if (child is T) controlList.Add((T)child); else SearchForControls<T>(child, ref controlList); } } } </code></pre> and Main_Page - only navigation: Xaml: <pre><code><Grid x:Name="LayoutRoot" Background="Transparent"> <Button x:Name="goToPage" Content="SecondPage" Width="Auto" Height="Auto" HorizontalAlignment="Center" VerticalAlignment="Center"/> </Grid> </code></pre> Code behind: <pre><code>public partial class MainPage : PhoneApplicationPage { public static ObservableCollection<string> collection = new ObservableCollection<string>(); public MainPage() { InitializeComponent(); goToPage.Click+=goToPage_Click; } private void goToPage_Click(object sender, RoutedEventArgs e) { NavigationService.Navigate(new Uri("/second_page.xaml", UriKind.Relative)); } } </code></pre> Just try to do the same with and without reentering the page: <ol> <li>add for example 3 elements, with debugger toggle a breakpoint at second line of showBtn_Click and Click the buton - it will show 6 elements! Do not touch anything except go back.</li> <li>Reenter the second page - you will se the correct LLS - with 3 elements as you click showBtn with breakpoint you will see 3 elements in the Visual Tree. Anybody tried this?</li> </ol>
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1. POLong List Selector Observable Collection and Visual Tree - problems?
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1. USRomasz
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