Xamarin Certification Xamarin Data and Services

Question 1

Which NuGet package provides SQLite database access in Xamarin cross-platform apps?

Accepted Answer

sqlite-net-pcl

Answer

sqlite-net-pcl (SQLite-Net) is the standard lightweight ORM for SQLite in Xamarin, supporting iOS and Android via a single PCL/NuGet.

Question 2

In Xamarin, which HttpClient handler is recommended for best performance on iOS?

Accepted Answer

NSUrlSessionHandler

Answer

NSUrlSessionHandler uses the native iOS networking stack, providing better performance, TLS support, and HTTP/2 compared to the managed handler.

Question 3

What is the recommended way to make HTTP REST calls in shared Xamarin code?

Accepted Answer

System.Net.Http.HttpClient

Answer

HttpClient from System.Net.Http is the cross-platform HTTP client available in .NET Standard and works in shared Xamarin code.

Question 4

Which Xamarin.Essentials API provides cross-platform access to the device's network connectivity status?

Accepted Answer

Connectivity

Answer

Xamarin.Essentials Connectivity class exposes NetworkAccess and ConnectionProfiles to check current network state cross-platform.

Question 5

In Xamarin, which pattern ensures HTTP API calls do not block the main thread?

Accepted Answer

async/await with Task-returning methods

Answer

Using async/await with HttpClient.GetAsync and similar Task-returning methods ensures network I/O is non-blocking and the UI remains responsive.

Xamarin Certification Practice Test