SystemThemeHelper

Provides utilities for managing and retrieving the current theme of the operating system and the application.

Theme Retrieval

Methods

Method	Return Type	Description
`GetCurrentOsTheme()`	`ApplicationTheme`	Retrieves the current theme of the operating system.
`GetApplicationTheme()`	`ApplicationTheme`	[Obsolete] Retrieves the current theme of the application. Will be removed in future versions.
`GetRootTheme(XamlRoot?)`	`ApplicationTheme`	Gets the `ApplicationTheme` of the provided `XamlRoot`, or falls back to the operating system theme.
`IsAppInDarkMode()`	`bool`	[Obsolete] Returns `true` if the application is currently in dark mode, otherwise `false`.
`IsRootInDarkMode(XamlRoot)`	`bool`	Determines if the provided `XamlRoot` is in dark mode.

Usage

Example of retrieving the current OS theme:

var osTheme = SystemThemeHelper.GetCurrentOsTheme();
Console.WriteLine($"Current OS Theme: {osTheme}");

Retrieve the application theme:

var xamlRoot = someElement.XamlRoot;
var appTheme = SystemThemeHelper.GetRootTheme(xamlRoot);
Console.WriteLine($"Current App Theme: {appTheme}");

Theme Management

Methods

Method	Description
`SetApplicationTheme(bool)`	[Obsolete] Sets the application theme to dark mode if `darkMode` is `true`, otherwise light mode. Will be removed in future versions.
`SetRootTheme(XamlRoot?, bool)`	Sets the theme for the provided `XamlRoot` based on the `darkMode` parameter.
`SetApplicationTheme(XamlRoot?, ElementTheme)`	Sets the `ElementTheme` (`Light` or `Dark`) for the provided `XamlRoot`.
`ToggleApplicationTheme()`	[Obsolete] Toggles the application theme between light and dark modes. Will be removed in future versions.

Usage

Set the theme for a specific XamlRoot:

var xamlRoot = someElement.XamlRoot;
SystemThemeHelper.SetApplicationTheme(xamlRoot, ElementTheme.Light);
Console.WriteLine("XamlRoot theme set to Light Mode.");