UWP - Save attributes of a xaml page (Slider/Combobox) - xaml

Question

I've got the following problem: In my main xaml page I've got a button which navigates to an other page which is called settings and which also includes settings for the app. I jump to the page with the following method:
this->Frame->Navigate(Windows::UI::Xaml::Interop::TypeName(Settings::typeid));
As you can understand I want the UI-Elements (Comboboxes/Sliders) to save theier attributes for the next time. Not even for the next launch of the app, just for the next jump on the settings page. If I go back from settings to main page and back to settings again, the values of the comboboxes and slider are reseted. I need them to be saved for my program's logic.
In my c++-desktop app I'm using registry entrys in order to save it, but this is not quite possible in uwp and it's not the easiest solution. In Java I would use a global static variable which saves the values and which is bind to UI-elements. How can I implement this in UWP ?

Answer 1

You can achieve that with the Page.NavigationCacheMode Property. With that property you are able to store the state of the page in the cache of the application.
You can either use it in the xaml-tag of the page, or set in the constructor in the code-behind of the page. You can find the possible values of the properties here.
Example-XAML:
<Page
x:Class="Foo.Namespace.SettingsPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Foo.Namespace"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
NavigationCacheMode="Enabled">
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
</Grid>
</Page>
Example CS:
public sealed partial class SettingsPage : Page
{
public SettingsPage()
{
this.InitializeComponent();
this.NavigationCacheMode = NavigationCacheMode.Enabled;
}
}