Winui3 Migration Guide
The winui3-migration-guide skill provides a reference for developers migrating Universal Windows Platform (UWP) applications to WinUI 3 and the Windows App SDK, mapping deprecated UWP APIs to their correct modern equivalents with before/after code examples. It addresses critical areas including namespace changes, threading model updates (CoreDispatcher to DispatcherQueue), windowing changes (CoreWindow to AppWindow), and dialogs, while also identifying the three most common mistakes that code generation tools make during migration. The skill serves Windows desktop developers who need accurate API guidance to modernize legacy UWP codebases or validate that generated code follows WinUI 3 standards rather than outdated UWP patterns.
- skills.sh installs
- 5.7K
- GitHub stars
- 41K
- last updated
- Aug 21, 2026
Install
$ npx -y skills add github/awesome-copilot --skill winui3-migration-guide --agent claude-codeInstalls into .claude/skills of the current project.
Files
WinUI 3 Migration Guide
Use this skill when migrating UWP apps to WinUI 3 / Windows App SDK, or when verifying that generated code uses correct WinUI 3 APIs instead of legacy UWP patterns.
Namespace Changes
All Windows.UI.Xaml.* namespaces move to Microsoft.UI.Xaml.*:
| UWP Namespace | WinUI 3 Namespace |
|---|---|
Windows.UI.Xaml | Microsoft.UI.Xaml |
Windows.UI.Xaml.Controls | Microsoft.UI.Xaml.Controls |
Windows.UI.Xaml.Media | Microsoft.UI.Xaml.Media |
Windows.UI.Xaml.Input | Microsoft.UI.Xaml.Input |
Windows.UI.Xaml.Data | Microsoft.UI.Xaml.Data |
Windows.UI.Xaml.Navigation | Microsoft.UI.Xaml.Navigation |
Windows.UI.Xaml.Shapes | Microsoft.UI.Xaml.Shapes |
Windows.UI.Composition | Microsoft.UI.Composition |
Windows.UI.Input | Microsoft.UI.Input |
Windows.UI.Colors | Microsoft.UI.Colors |
Windows.UI.Text | Microsoft.UI.Text |
Windows.UI.Core | Microsoft.UI.Dispatching (for dispatcher) |
Top 3 Most Common Copilot Mistakes
1. ContentDialog Without XamlRoot
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- Repository
- github.com/github/awesome-copilot
- Categories
- Git & Pull Requests, Documentation, AI & Agent Building
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