PresentationFramework.Fluent 1.0.0

PresentationFramework.Fluent#NET48

PresentationFramework.Fluent#NET48 is a port of the Fluent theme from .NET 9+ to .NET Framework 4.8. The goal of this project is to provide a minimalist implementation of Fluent styles for standard WPF elements on the legacy Framework 4.8. Only the essentials, nothing extra.

Overview

The Fluent theme is known in .NET 9+ as the modern Windows 11 theme, featuring transparent elements, smooth animations, and a contemporary UI design. In the original version, many resources and styles use internal types and resource components (ComponentResourceKey) that are not directly supported in Net Framework 4.8. These have been replaced with analogs or commented out (see TODO). This port also provides all styles separately, allowing you to combine them across different elements.

This port:

• Porting core styles for Window, Button, TextBox, ComboBox, Calendar, DataGrid, and other standard elements.
• Replaces internal keys with public resources available at runtime in Net Framework 4.8.
• Supports DynamicResource and StaticResource for colors, Brushes, and ControlTemplates.
• Allows connecting the Fluent theme as an external ResourceDictionary or integrating it into your App.xaml.

Features

• ✅ Fully functional styles for WPF elements on .NET Framework 4.8.
• ✅ 4 themes available to choose from: Fluent.Light, Fluent.Dark, Fluent, and Fluent.HC (High Contrast).
• ✅ Support for HighContrast mode via SystemParameters.HighContrast.
• ✅ Easy integration into your project: App.xaml — required if you plan to use the Designer.

  <Application.Resources>
      <ResourceDictionary>
          <ResourceDictionary.MergedDictionaries>
              <ResourceDictionary Source="/PresentationFramework.Fluent;component/Themes/Fluent.Dark.xaml"/>
          </ResourceDictionary.MergedDictionaries>
      </ResourceDictionary>
  </Application.Resources>
  

  YourWindow.xaml — required if you want the window background to be automatically applied from the theme.

  <Window x:Class="YourNamespace.MainWindow"
          xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
          xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      Title="YourWindow" Style="{StaticResource DefaultWindowStyle}">
  </Window>
  

⛔ What is not supported:

As mentioned above, some resource components available only in NET 9+ are not supported. Additionally, the port does not support:

• ❌ Auto-detection of system theme
• ❌ Auto-detection of system colors
• ❌ Automatic changes to the TitleBar and SystemContextMenu according to the theme

See the next section for a possible solution to these issues.

💡 Usage with DarkNet

The Title Bar and Context Menu styling still doesn’t fully match the default .NET 9.0+ look. Yeah, it's a pain. One workaround is to use the DarkNet lib. It features a SkinManager that allows you to define Fluent themes as follows:

YourWindow.xaml.cs

	public MainWindow()
	{
	    InitializeComponent();

	    new SkinManager().RegisterSkins(
	        lightThemeResources: FluentHelper.LightThemeUri,
	        darkThemeResources: FluentHelper.DarkThemeUri);

	    DarkNet.Instance.SetWindowThemeWpf(this, Theme.Auto);
	}

<img width="801" height="458" alt="Image" src="https://github.com/user-attachments/assets/8a147f8c-070e-4a7c-82a0-2215f5c2c4b8" />