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POHow to Terminate an Application Properly and Save Data
 

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  1. POHow to Terminate an Application Properly and Save Data
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    <p>I have recently come across the <code>App.Current.Terminate</code> method, which I would like to use in an application. Before calling this, however, I need to save some data. For some reason, even though the save seems to be shown as effective, once the application is terminated the old settings are restored. I cannot figure out what is going on. I have a ListPicker, and I am trying to change the theme setting in my application between light and dark, using Jeff Wilcox's <code>ThemeManager</code>. </p> <p>SettingsPage.xaml</p> <pre><code>&lt;Grid.Resources&gt; &lt;DataTemplate x:Name="PickerItemTemplate"&gt; &lt;StackPanel Tap="stk_Tap"&gt; &lt;TextBlock Text="{Binding Name}"/&gt; &lt;/StackPanel&gt; &lt;/DataTemplate&gt; &lt;/Grid.Resources&gt; ... &lt;toolkit:ListPicker x:Name="ThemeListPicker" Header="Theme" ItemTemplate="{StaticResource PickerItemTemplate}"/&gt; </code></pre> <p>SettingsPage.xaml.cs</p> <pre><code>List&lt;Theme&gt; themeList; private int currentThemeIndex; protected override void OnNavigatedTo(NavigationEventArgs e) { base.OnNavigatedTo(e); themeList = new List&lt;Theme&gt;(); themeList.Add(new Theme() { Name = "light", name = "light" }); //Name subject to change themeList.Add(new Theme() { Name = "dark", name = "dark" }); //Name subject to change ThemeListPicker.ItemsSource = themeList; //make sure ThemeListPicker shows current theme when NavigatedTo if (Settings.LightTheme.Value) { ThemeListPicker.SelectedIndex = 0; currentThemeIndex = 0; } else { ThemeListPicker.SelectedIndex = 1; currentThemeIndex = 1; } } private void stk_Tap(object sender, System.Windows.Input.GestureEventArgs e) { if (ThemeListPicker.SelectedIndex != -1) { //avoid asking the question if the selected item is the same as the current item //doesn't quite work properly? Skips when the item is changed for the first time if(ThemeListPicker.SelectedIndex != currentThemeIndex) { MessageBoxResult result = MessageBox.Show("The app must be restarted to apply theme changes."", "", MessageBoxButton.OKCancel); if (result == MessageBoxResult.OK) { var selectedItem = (Theme)(sender as StackPanel).DataContext; switch (selectedItem.name) { case "light": Settings.LightTheme.Value = true; currentThemeIndex = 0; break; case "dark": Settings.LightTheme.Value = false; currentThemeIndex = 1; break; default: Settings.LightTheme.Value = true; currentThemeIndex = 0; break; } Terminate(); } } } private void Terminate() { App.Current.Terminate(); } </code></pre> <p>Theme.cs</p> <pre><code>public class Theme { public string Name { get; set; } public string name //name to use in determining current theme { get; set; } } </code></pre> <p>Settings.cs //writes key/value pair to IsoStore</p> <pre><code>//Theme - set to true by default public static readonly Setting&lt;bool&gt; LightTheme = new Setting&lt;bool&gt;("LightTheme", true); </code></pre> <p>App.xaml.cs</p> <pre><code>public App() { ... //Theme Manager if (Settings.LightTheme.Value) ThemeManager.ToLightTheme(); else ThemeManager.ToDarkTheme(); ... } </code></pre> <p>The main problem is that the theme never changes. I set a breakpoint in App.xaml.cs to check the current value of <code>Settings.LightTheme.Value</code> on application load, which always stays as true which sets the app to the light theme. In SettingsPage.xaml.cs when a user selects either the light or dark option in the ListPicker, I detect that the value of <code>Settings.LightTheme.Value</code> switches between true and false. Immediately after, since the user must select OK on the MessageBox to restart the application, the app is terminated. Upon restarting, <code>Settings.LightTheme.Value</code> is true. I am not sure how to fix this?</p>
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    1. USMatthew
    1. USMatthew
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    1. COcould you please share with the code for saving the current theme into Isolated Storage?
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    2. COI just posted it.
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      1. USMatthew
 

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