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How to: Persist and Restore Application-Scope Properties Across Application Sessions |
Learn how to persist and restore application-scope properties across application sessions via included code examples in XAML, C#, and Visual Basic. |
06/13/2024 |
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55d5904a-f444-4eb5-abd3-6bc74dd14226 |
This example shows how to persist application-scope properties when an application shuts down, and how to restore application-scope properties when an application is next launched.
The application persists application-scope properties to, and restores them from, isolated storage. Isolated storage is a protected storage area that can safely be used by applications without file access permission. The App.xaml file defines the App_Startup method as the handler for the xref:System.Windows.Application.Startup?displayProperty=nameWithType event, and the App_Exit method as the handler for the xref:System.Windows.Application.Exit?displayProperty=nameWithType event, as shown in the highlighted lines of the following XAML:
Note
The following XAML is written for CSharp. The Visual Basic version omits the class declaration.
:::code language="xaml" source="./snippets/persist-and-restore-application-scope-properties/csharp/App.xaml" highlight="5,6":::
This next example shows the Application code-behind, which contains the event handlers for the XAML. The App_Startup method restores application-scope properties, and the App_Exit method saves application-scope properties.
:::code language="csharp" source="./snippets/persist-and-restore-application-scope-properties/csharp/App.xaml.cs":::
:::code language="vb" source="./snippets/persist-and-restore-application-scope-properties/vb/Application.xaml.vb":::