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

System.Data.SQLite

Answer

EntityFrameworkCore.Sqlite

Answer

Mono.Data.Sqlite

Question 2

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

Accepted Answer

NSUrlSessionHandler

Answer

HttpClientHandler

Answer

ModernHttpClient

Answer

CFNetworkHandler

Question 3

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

Accepted Answer

System.Net.Http.HttpClient

Answer

NSURLConnection

Answer

OkHttp

Answer

WebClient

Question 4

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

Accepted Answer

Connectivity

Answer

NetworkInfo

Answer

Reachability

Answer

NetworkAccess

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

Thread.Start with callbacks

Answer

BackgroundWorker

Answer

Parallel.For

Question 6

Which library is commonly used for JSON serialization and deserialization in Xamarin applications?

Accepted Answer

Newtonsoft.Json (Json.NET)

Answer

System.Xml.Serialization

Answer

Google.Gson

Answer

Codable