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 namespaces move to : | UWP Namespace | WinUI 3 Namespace | |--------------|-------------------| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (for dispatcher) | --- Top 3 Most Common Copilot Mistakes 1. ContentDialog Without XamlRoot 2. MessageDialog Instead of ContentDialog 3. CoreDispatcher Instead of DispatcherQueue --- Windowing Migration Window Referenc…