Xamarin Certification Cheat Sheet 2026

The 30 highest-yield Xamarin Certification facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. What does the [IntentFilter] attribute do in Xamarin.Android? → Declares which intents an Activity or receiver responds to
2. In Xamarin cross-platform development, what is the Dependency Service used for? → Resolving platform-specific implementations from shared code
3. Which service type in Xamarin.Android runs in the foreground with a persistent notification? → Foreground Service
4. In Xamarin, what does the Repository pattern provide when working with data sources? → An abstraction over data access logic, separating business logic from data source details
5. What is a XIB file in the context of Xamarin.iOS? → An Interface Builder file defining a single view or window
6. What does code signing accomplish in a Xamarin.iOS release build? → Cryptographically authenticates the app and enables distribution through the App Store
7. In Xamarin.Android, which tool from the Android SDK helps identify over-drawn pixels and excessive layout nesting that degrades rendering performance? → GPU Overdraw visualization and Layout Inspector in Android Studio
8. Which Xamarin App Center feature provides continuous integration and automated builds? → App Center Build
9. In Xamarin.Android, which Garbage Collector mode is recommended for apps with frequent short-lived allocations to minimize GC pause times? → SGen (Generational GC)
10. Which Xamarin.iOS class is used to present a modal view controller? → PresentViewController
11. Which Xamarin.Essentials class provides cross-platform access to the device clipboard? → Clipboard
12. Which .NET project type replaced PCL as the preferred Xamarin shared library format? → .NET Standard Library
13. There are no APIs available in the Xamarin.Essentials library for → None of the above
14. In Xamarin SQLite-Net, which attribute marks a property as the primary key with auto-increment? → [PrimaryKey, AutoIncrement]
15. What does the Linker do in a Xamarin.iOS release build? → Removes unused code to reduce app size
16. Which App Center feature allows distributing beta builds to testers before public release? → App Center Distribute
17. In Xamarin.iOS, which compilation mode converts IL to native ARM code ahead of time? → AOT (Ahead-of-Time)
18. Which Xamarin.Essentials method sends an email using the device's default mail app? → Email.ComposeAsync
19. In Xamarin.iOS, what file format is used for Interface Builder storyboards? → .storyboard
20. In Xamarin.Android, which layout positions child views relative to each other or the parent? → RelativeLayout
21. Which Xamarin.Essentials API provides cross-platform access to the device's geolocation? → Geolocation
22. Who is the company owner of Xamarin? → Microsoft
23. In Xamarin, what is the purpose of a Custom Renderer? → Overrides the default platform rendering of a Xamarin.Forms control
24. What is D8 in the context of Xamarin.Android builds? → The DEX compiler that converts .NET IL to Dalvik bytecode
25. Which Azure service is commonly integrated with Xamarin apps for backend data sync and offline support? → Azure Mobile Apps (Easy Tables)
26. Which Xamarin.Essentials API provides cross-platform access to the device's network connectivity status? → Connectivity
27. In Xamarin.iOS, what file must be included when submitting to the App Store to enable full crash symbolication? → dSYM file (Debug Symbol file)
28. What is the role of UIViewController in Xamarin.iOS? → Manages a single screen's view and lifecycle
29. Which tool is built into Visual Studio and used to profile CPU usage and memory allocations in Xamarin applications? → Xamarin Profiler
30. The creator(s) of the application also came up with one of the following → Mono