winui3-migration-guide
Complete reference for migrating UWP apps to WinUI 3 with before/after code examples.
- Maps all namespace changes from
Windows.UI.Xaml.*toMicrosoft.UI.Xaml.*, plus threading, windowing, and dialog APIs - Covers the three most common Copilot mistakes: ContentDialog without XamlRoot, MessageDialog usage, and CoreDispatcher patterns
- Includes migration tables for window management, pickers, background tasks, settings, and GetForCurrentView() replacements
- Provides a 15-item migration checklist and guidance on updating unit test projects to WinUI 3 test templates with
[UITestMethod]attributes
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.*:
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