winui3-migration-guide

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UWP-to-WinUI 3 migration reference. Maps legacy UWP APIs to correct Windows App SDK equivalents with before/after code snippets. Covers namespace changes, threading (CoreDispatcher to DispatcherQueue), windowing (CoreWindow to AppWindow), dialogs, pickers, sharing, printing, background tasks, and the most common Copilot code generation mistakes.

Code & Development 34,233 stars 4188 forks Updated today MIT

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Skill Content

# 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 ```csharp // ❌ WRONG — Throws InvalidOperationException in WinUI 3 var dialog = new ContentDialog { Title = "Error", Content = "Something went wrong.", CloseButtonText = "OK" }; await dialog.ShowAsync(); ``` ```csharp // ✅ CORRECT — Set XamlRoot before showing var dialog = new ContentDialog { Title = "Error", Content = "Something went wrong.", CloseButtonText = "OK",...

Details

Author: github
Repository: github/awesome-copilot
Created: 11 months ago
Last Updated: today
Language: Python
License: MIT

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