Xamarin Certification Xamarin Certification 5

Question 1

Which Xamarin.Forms CollectionView feature allows items to be selected by the user?

Accepted Answer

SelectionMode property set to Single or Multiple

Answer

CollectionView exposes a SelectionMode property that can be None, Single, or Multiple to control item selection behavior.

Question 2

In Xamarin.Forms, what does the BindingContext property on a View represent?

Accepted Answer

The object that serves as the source for data bindings

Answer

BindingContext is the data object whose properties are referenced by data bindings on the view and its children.

Question 3

Which build configuration linker option in Xamarin.iOS removes unused code to reduce app size?

Accepted Answer

Link All

Answer

'Link All' instructs the linker to analyze and remove unused code from both SDK assemblies and user assemblies.

Question 4

What is the purpose of the MessagingCenter in Xamarin.Forms?

Accepted Answer

To enable loosely coupled communication between components via a publish-subscribe pattern

Answer

MessagingCenter implements a publish-subscribe mechanism allowing components to communicate without direct references.

Question 5

Which Xamarin.Forms layout positions children using proportional or absolute coordinates?

Accepted Answer

AbsoluteLayout

Answer

AbsoluteLayout positions children using explicit x/y coordinates or proportional bounds relative to the layout.

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