Part 2 Complete code (Windows Store apps using C#/VB and XAML)

Applies to Windows only

This topic provides the complete code sample used in the tutorial Part 2: Manage app lifecycle and state.

Important  This tutorial is intended for use with Microsoft Visual Studio 2013 and Windows 8.1. Parts of it will not work correctly with Microsoft Visual Studio 2012 and Windows 8.

This topic contains these sections:

Download location

This sample is not available for download.

Technologies

Programming languagesC#, Visual Basic .NET
Programming modelsWindows Runtime

Requirements

Minimum supported clientWindows 8.1
Minimum supported serverWindows Server 2012 R2
Minimum required SDKMicrosoft Visual Studio Express 2012 for Windows 8

View the code (XAML)

App.xaml

App.xaml contains only generated code.

App.xaml.cs/vb

' The Blank Application template is documented at http://go.microsoft.com/fwlink/p/?LinkID=234227

''' <summary>
''' Provides application-specific behavior to supplement the default Application class.
''' </summary>
NotInheritable Class App
    Inherits Application

    ''' <summary>
    ''' Invoked when the application is launched normally by the end user.  Other entry points
    ''' will be used when the application is launched to open a specific file, to display
    ''' search results, and so forth.
    ''' </summary>
    ''' <param name="e">Details about the launch request and process.</param>
    Protected Overrides Async Sub OnLaunched(e As Windows.ApplicationModel.Activation.LaunchActivatedEventArgs)
#If DEBUG Then
        ' Show graphics profiling information while debugging.
        If System.Diagnostics.Debugger.IsAttached Then
            ' Display the current frame rate counters
            Me.DebugSettings.EnableFrameRateCounter = True
        End If
#End If

        Dim rootFrame As Frame = TryCast(Window.Current.Content, Frame)

        ' Do not repeat app initialization when the Window already has content,
        ' just ensure that the window is active

        If rootFrame Is Nothing Then
            ' Create a Frame to act as the navigation context and navigate to the first page
            rootFrame = New Frame()
            HelloWorld.Common.SuspensionManager.RegisterFrame(rootFrame, "appFrame")

            If e.PreviousExecutionState = ApplicationExecutionState.Terminated Then
                ' TODO: Load state from previously suspended application
                Await HelloWorld.Common.SuspensionManager.RestoreAsync()
            End If
            ' Place the frame in the current Window
            Window.Current.Content = rootFrame
        End If
        If rootFrame.Content Is Nothing Then
            ' When the navigation stack isn't restored navigate to the first page,
            ' configuring the new page by passing required information as a navigation
            ' parameter
            If Not rootFrame.Navigate(GetType(MainPage), e.Arguments) Then
                Throw New Exception("Failed to create initial page")
            End If
        End If

        ' Ensure the current window is active
        Window.Current.Activate()
    End Sub

    ''' <summary>
    ''' Invoked when application execution is being suspended.  Application state is saved
    ''' without knowing whether the application will be terminated or resumed with the contents
    ''' of memory still intact.
    ''' </summary>
    ''' <param name="sender">The source of the suspend request.</param>
    ''' <param name="e">Details about the suspend request.</param>
    Private Async Sub OnSuspending(sender As Object, e As SuspendingEventArgs) Handles Me.Suspending
        Dim deferral As SuspendingDeferral = e.SuspendingOperation.GetDeferral()
        ' TODO: Save application state and stop any background activity
        Await HelloWorld.Common.SuspensionManager.SaveAsync()
        deferral.Complete()
    End Sub

End Class

MainPage.xaml


<Page
    x:Name="pageRoot"
    x:Class="HelloWorld.MainPage"
    DataContext="{Binding DefaultViewModel, RelativeSource={RelativeSource Self}}"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:HelloWorld"
    xmlns:common="using:HelloWorld.Common"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <Page.Resources>
        <common:BooleanToVisibilityConverter x:Key="BooleanToVisibilityConverter"/>
        <!-- TODO: Delete this line if the key AppName is declared in App.xaml -->
        <x:String x:Key="AppName">Hello, world!</x:String>
        <Style x:Key="BigGreenTextStyle" TargetType="TextBlock">
            <Setter Property="Foreground" Value="Green"/>
            <Setter Property="FontSize" Value="36"/>
            <Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}"/>
            <Setter Property="TextTrimming" Value="CharacterEllipsis"/>
            <Setter Property="TextWrapping" Value="Wrap"/>
            <Setter Property="Typography.StylisticSet20" Value="True"/>
            <Setter Property="Typography.DiscretionaryLigatures" Value="True"/>
            <Setter Property="Typography.CaseSensitiveForms" Value="True"/>
            <Setter Property="LineStackingStrategy" Value="BlockLineHeight"/>
            <Setter Property="TextLineBounds" Value="TrimToBaseline"/>
            <Setter Property="OpticalMarginAlignment" Value="TrimSideBearings"/>
        </Style>
    </Page.Resources>

    <!--
        This grid acts as a root panel for the page that defines two rows:
        * Row 0 contains the back button and page title
        * Row 1 contains the rest of the page layout
    -->
    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
        <Grid.ChildrenTransitions>
            <TransitionCollection>
                <EntranceThemeTransition/>
            </TransitionCollection>
        </Grid.ChildrenTransitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="140"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <!-- Back button and page title -->
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="120"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>
            <AppBarButton x:Name="backButton" Icon="Back" Height="95" Margin="10,46,10,0"
                          Command="{Binding NavigationHelper.GoBackCommand, ElementName=pageRoot}" 
                          Visibility="{Binding IsEnabled, Converter={StaticResource BooleanToVisibilityConverter}, RelativeSource={RelativeSource Mode=Self}}"
                          AutomationProperties.Name="Back"
                          AutomationProperties.AutomationId="BackButton"
                          AutomationProperties.ItemType="Navigation Button"/>
            <TextBlock x:Name="pageTitle" Text="{StaticResource AppName}" 
                       Style="{StaticResource HeaderTextBlockStyle}" Grid.Column="1" 
                       IsHitTestVisible="false" TextWrapping="NoWrap" VerticalAlignment="Bottom" Margin="0,0,30,40"/>
        </Grid>

        <StackPanel Grid.Row="1" Margin="120,30,0,0">
            <TextBlock Text="What's your name?" Style="{ThemeResource BaseTextBlockStyle}"/>
            <StackPanel Orientation="Horizontal" Margin="0,20,0,20">
                <TextBox x:Name="nameInput" Width="300" HorizontalAlignment="Left" TextChanged="NameInput_TextChanged"/>
                <Button Content="Say &quot;Hello&quot;" Click="Button_Click"/>
            </StackPanel>
            <TextBlock x:Name="greetingOutput" Style="{StaticResource BigGreenTextStyle}"/>
        </StackPanel>
    </Grid>
</Page>


MainPage.xaml.cs/vb

' The Basic Page item template is documented at http://go.microsoft.com/fwlink/p/?LinkID=234237

''' <summary>
''' A basic page that provides characteristics common to most applications.
''' </summary>
Public NotInheritable Class MainPage
    Inherits Page

    ''' <summary>
    ''' NavigationHelper is used on each page to aid in navigation and 
    ''' process lifetime management
    ''' </summary>
    Public ReadOnly Property NavigationHelper As Common.NavigationHelper
        Get
            Return Me._navigationHelper
        End Get
    End Property
    Private _navigationHelper As Common.NavigationHelper

    ''' <summary>
    ''' This can be changed to a strongly typed view model.
    ''' </summary>
    Public ReadOnly Property DefaultViewModel As Common.ObservableDictionary
        Get
            Return Me._defaultViewModel
        End Get
    End Property
    Private _defaultViewModel As New Common.ObservableDictionary()

    Public Sub New()

        InitializeComponent()
        Me._navigationHelper = New Common.NavigationHelper(Me)
        AddHandler Me._navigationHelper.LoadState, AddressOf NavigationHelper_LoadState
        AddHandler Me._navigationHelper.SaveState, AddressOf NavigationHelper_SaveState
    End Sub

    ''' <summary>
    ''' Populates the page with content passed during navigation.  Any saved state is also
    ''' provided when recreating a page from a prior session.
    ''' </summary>
    ''' <param name="sender">
    ''' The source of the event; typically <see cref="NavigationHelper"/>
    ''' </param>
    ''' <param name="e">Event data that provides both the navigation parameter passed to
    ''' <see cref="Frame.Navigate"/> when this page was initially requested and
    ''' a dictionary of state preserved by this page during an earlier
    ''' session.  The state will be null the first time a page is visited.</param>
    Private Sub NavigationHelper_LoadState(sender As Object, e As Common.LoadStateEventArgs)
        ' Restore values stored in session state.
        If e.PageState IsNot Nothing AndAlso e.PageState.ContainsKey("greetingOutputText") Then
            greetingOutput.Text = e.PageState("greetingOutputText").ToString()
        End If

        ' Restore values stored in app data.
        Dim roamingSettings =
            Windows.Storage.ApplicationData.Current.RoamingSettings

        If roamingSettings.Values.ContainsKey("userName") Then
            nameInput.Text = roamingSettings.Values("userName").ToString()
        End If
    End Sub

    ''' <summary>
    ''' Preserves state associated with this page in case the application is suspended or the
    ''' page is discarded from the navigation cache.  Values must conform to the serialization
    ''' requirements of <see cref="Common.SuspensionManager.SessionState"/>.
    ''' </summary>
    ''' <param name="sender">
    ''' The source of the event; typically <see cref="NavigationHelper"/>
    ''' </param>
    ''' <param name="e">Event data that provides a dictionary of state preserved by this page 
    ''' during an earlier session.  The state will be null the first time a page is visited.</param>
    Private Sub NavigationHelper_SaveState(sender As Object, e As Common.SaveStateEventArgs)
        e.PageState("greetingOutputText") = greetingOutput.Text
    End Sub

#Region "NavigationHelper registration"

    ''' The methods provided in this section are simply used to allow
    ''' NavigationHelper to respond to the page's navigation methods.
    ''' 
    ''' Page specific logic should be placed in event handlers for the  
    ''' <see cref="Common.NavigationHelper.LoadState"/>
    ''' and <see cref="Common.NavigationHelper.SaveState"/>.
    ''' The navigation parameter is available in the LoadState method 
    ''' in addition to page state preserved during an earlier session.

    Protected Overrides Sub OnNavigatedTo(e As NavigationEventArgs)
        _navigationHelper.OnNavigatedTo(e)
    End Sub

    Protected Overrides Sub OnNavigatedFrom(e As NavigationEventArgs)
        _navigationHelper.OnNavigatedFrom(e)
    End Sub

#End Region


    Private Sub Button_Click(sender As Object, e As RoutedEventArgs)
        greetingOutput.Text = "Hello, " & nameInput.Text & "!"
    End Sub

    Private Sub NameInput_TextChanged(sender As Object, e As TextChangedEventArgs) Handles nameInput.TextChanged
        Dim roamingSettings = Windows.Storage.ApplicationData.Current.RoamingSettings
        roamingSettings.Values("userName") = nameInput.Text
    End Sub
End Class

 

 

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