Xamarin Certification Xamarin Cross-Platform Architecture 3

Question 1

What is the main benefit of using .NET MAUI over Xamarin.Forms for new projects?

Accepted Answer

Single project with multi-targeting, improved performance, and modern .NET 6+ runtime

Answer

.NET MAUI uses a single project with multi-targeting, eliminating the need for separate platform head projects and running on .NET 6+.

Question 2

In Xamarin cross-platform development, what does the Platform Abstraction Layer (PAL) concept refer to?

Accepted Answer

A layer of interfaces and adapters that isolates shared code from platform APIs

Answer

The PAL provides interfaces that shared business logic uses, with platform projects supplying concrete implementations, enabling testability and portability.

Question 3

Which tool is used to profile Xamarin applications for memory and CPU performance?

Accepted Answer

Xamarin Profiler

Answer

Xamarin Profiler integrates with Visual Studio and provides memory allocation, time profiling, and cycle tracking for both iOS and Android.

Question 4

What is the purpose of the Xamarin.Essentials SecureStorage API?

Accepted Answer

Stores key-value pairs securely using platform-native encryption

Answer

SecureStorage uses iOS Keychain and Android KeyStore to persist sensitive data like tokens securely across app launches.

Question 5

In Xamarin architecture, what is Inversion of Control (IoC) typically used for?

Accepted Answer

Decoupling class dependencies by injecting them rather than hard-coding them

Answer

IoC containers like TinyIoC, Autofac, or DryIoc manage dependency injection, allowing shared and platform code to remain loosely coupled.

Xamarin Certification Practice Test

Xamarin Certification Practice Test

Xamarin Certification Xamarin Cross-Platform Architecture 3