Windows Desktop Runtime 8.0 11 Updated -

private void ApplyAcrylicIfSupported() { if (IsWindows11OrNewer()) { var acrylicBrush = new SolidColorBrush(Color.FromArgb(180, 32, 32, 32)); AcrylicBorder.Background = acrylicBrush; // Real acrylic requires WinUI or custom composition – for demo we use semi-transparent. } }

using System; using System.Runtime.InteropServices; using System.Windows; using System.Windows.Media; namespace Win11AcrylicFeature { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); SourceInitialized += (s, e) => Win11ThemeHelper.ApplyDarkTitleBar(this); Loaded += (s, e) => ApplyAcrylicIfSupported(); } windows desktop runtime 8.0 11

<PropertyGroup> <OutputType>WinExe</OutputType> <TargetFramework>net8.0-windows10.0.17763.0</TargetFramework> <UseWPF>true</UseWPF> <UseWindowsForms>false</UseWindowsForms> <SupportedOSPlatformVersion>10.0.17763.0</SupportedOSPlatformVersion> </PropertyGroup> Create a helper class Win11ThemeHelper.cs : AcrylicBorder.Background = acrylicBrush

It sounds like you want to develop a feature for an app that runs on using .NET 8.0 (the runtime version) and is intended for Windows 11 (or Windows 10/11 with modern APIs). SourceInitialized += (s

[DllImport("dwmapi.dll")] private static extern int DwmSetWindowAttribute(IntPtr hwnd, int attr, ref bool value, int size);