How to focus a TextBox in an AppBar in a C # Metro app?

Question

I have the following code:

<Page.BottomAppBar> <AppBar x:Name="MyAppBar" Height="32" IsOpen="True" Opened="MyAppBar_Opened"> <TextBox x:Name="SearchBar" Grid.Row="2" KeyDown="SearchBar_KeyDown"/> </AppBar> </Page.BottomAppBar> 

The problem is that it has no focus when the application opens, it also has no focus when I double-click twice to close and reopen it.

Currently, I have the following code in MyAppBar_Opened and OnNavigatedTo :

 if (MyAppBar == null) return; MyAppBar.Focus(Windows.UI.Xaml.FocusState.Keyboard); if (SearchBar == null) return; SearchBar.Focus(Windows.UI.Xaml.FocusState.Keyboard); 

But this does not seem to have any effect; other enum values, such as Mouse or Programmatic , also do not work. What am I doing wrong that does not lead to activation?

I know an alternative that used to work, but the Metro FocusManager does not have a SetFocusedElement?

Answer 1

This works for me:

XAML:

 <Page x:Class="Application5.BlankPage" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="using:Application5" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"> <Grid Background="{StaticResource ApplicationPageBackgroundBrush}"> <AppBar x:Name="MyAppBar" Height="32" IsOpen="True" Opened="MyAppBar_Opened" Loaded="MyAppBar_Loaded" VerticalAlignment="Bottom"> <TextBox x:Name="SearchBar" HorizontalAlignment="Stretch" /> </AppBar> </Grid> </Page> 

Code behind:

 using System; using System.Collections.Generic; using System.IO; using System.Linq; using Windows.Foundation; using Windows.Foundation.Collections; using Windows.UI.Xaml; using Windows.UI.Xaml.Controls; using Windows.UI.Xaml.Controls.Primitives; using Windows.UI.Xaml.Data; using Windows.UI.Xaml.Input; using Windows.UI.Xaml.Media; using Windows.UI.Xaml.Navigation; // The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238 namespace Application5 { /// <summary> /// An empty page that can be used on its own or navigated to within a Frame. /// </summary> public sealed partial class BlankPage : Page { public BlankPage() { this.InitializeComponent(); } /// <summary> /// Invoked when this page is about to be displayed in a Frame. /// </summary> /// <param name="e">Event data that describes how this page was reached. The Parameter /// property is typically used to configure the page.</param> protected override void OnNavigatedTo(NavigationEventArgs e) { } private void MyAppBar_Opened(object sender, object e) { if (SearchBar != null) SearchBar.Focus(Windows.UI.Xaml.FocusState.Programmatic); } private void MyAppBar_Loaded(object sender, RoutedEventArgs e) { if (SearchBar != null) SearchBar.Focus(Windows.UI.Xaml.FocusState.Programmatic); } } }