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What are the main steps to migrate a Xamarin.Forms app to MAUI? How do namespaces and using directives change from Xamarin.Forms to MAUI? How do you convert a Xamarin.Forms custom renderer to a MAUI handler? How do you replace DependencyService with MAUI dependency injection? How do you decide between a big-bang and incremental MAUI migration?
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.NET MAUI › Migration from Xamarin.Forms

What common breaking changes should you expect when migrating to MAUI?

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Watch for: removed/renamed layout options (StackLayout defaults, some AbsoluteLayout behavior), FormsApplicationDelegate/Activity base classes becoming Maui* equivalents, DependencyService replaced by DI, App.xaml resource resolution differences, image/font declaration changes, and third-party libraries needing MAUI versions. Test layouts closely since spacing/measure changed.
Real-world example A migrated screen looks slightly off until the team adjusts StackLayout spacing and switches DependencyService calls to injected services.

Common follow-ups: What replaces DependencyService? | Why re-test layouts after migration?

Migration Dependency Injection Migration from Xamarin.Forms
All 6 Migration from Xamarin.Forms questions