Overview

Migrate your UWP, WPF, and WinForms apps to WinUI 3 with a clear, end to end plan that you can actually ship. Moving a real production desktop app to WinUI 3 and the Windows App SDK is not a simple control swap. You are changing the app model, activation flow, windowing behavior, deployment story, and often your architecture at the same time. Migrating to WinUI 3: Modernize Legacy Windows Desktop Applications guides you through that change step by step, from fundamentals and solution architecture to platform features, Fluent design, deployment, testing, and release discipline, so you can modernize without breaking what users rely on. Understand what WinUI 3 is, how it differs from the UWP app model, and how the Windows App SDK runtime and versioning strategy affect your app. Choose the right migration approach for your product, rewrite vs incremental vs hybrid, backed by a practical readiness checklist and risk register. Design a solution architecture that separates UI, business logic, and infrastructure, using shared class libraries, multi targeting, dependency injection, configuration, and logging. Set up WinUI 3 projects the professional way, with clean App startup, window creation patterns, threading and DispatcherQueue usage, windowing with Window and AppWindow, and resilient navigation. Handle activation and single instance behavior using AppInstance and ActivatedEventArgs, including file and protocol activation that routes into your existing navigation stack. Migrate UWP features confidently, replacing lifecycle assumptions, mapping APIs such as Window.Current, CoreDispatcher, and CoreWindow, updating XAML namespaces and styles, and moving notifications, background tasks, and localization to Windows App SDK and MRT Core. Modernize WPF and WinForms apps with a feature adoption first mindset, safely calling Windows App SDK feature APIs, hosting WinUI content with islands concepts, and building hybrid shells that keep legacy modules behind clean interfaces. Apply Fluent design to real desktop layouts with themes, typography, light and dark mode, Mica and Acrylic backdrops with SystemBackdrop, and strong accessibility support for high contrast and keyboard users. Make deliberate packaging and deployment choices, packaged vs unpackaged vs external location, framework dependent vs self contained, using the bootstrapper API, dynamic dependencies, and a diagnostics friendly deployment troubleshooting approach. Strengthen testing and performance with golden path regression strategies, automated UI testing options, performance profiling for startup, memory, and responsiveness, plus stability hardening, crash triage, telemetry basics, and a release playbook with rollback and post migration maintenance. This is a code heavy guide, with practical C# and XAML snippets that show how to apply WinUI 3 and Windows App SDK patterns in real project scenarios, not just in isolated samples. If you are responsible for shipping a modern WinUI 3 desktop app from a legacy UWP, WPF, or WinForms codebase, grab your copy today.

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