net9.0-windows10.0.22621 
namespace System.Windows
{
    [Localizability(LocalizationCategory.Ignore)]
    public class Window : ContentControl
    {
        [Experimental("WPF0001")]
        [TypeConverter(typeof(ThemeModeConverter))]
        public ThemeMode ThemeMode { get; set; }
    }
}
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Get property
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.NET 9.0
Information specific to net9.0
Platforms This API is only available when you target a specific platform:
Windows 7.08.010.0.1776310.0.1836210.0.1904110.0.2034810.0.2200010.0.22621
Information specific to net9.0-windows10.0.22621
Assembly

PresentationFramework , Version=9.0.0.0, PublicKeyToken=31bf3856ad364e35

Referencing

Your project needs to set <UseWPF>True</UseWPF>.

Preview WPF0001: This API is marked as experimental.(more details)
Platform Restrictions

The property getter is only supported on the following platforms:

  • Windows

The property setter is only supported on the following platforms:

  • Windows
  • Built-in API
  • Package-provided API