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Xamarin MVVM Online Test

Topics Covered

  • StringFormat attribute
  • Xamarin Forms
  • DataContext
  • ViewModel
  • MVVM Frameworks
  • ValueConverter in XAML

Useful for hiring

  • Xamarin Developer - MVVM

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You have a requirement to format Decimal values using the Currency string format in Labels, which of the following are the correct ways to do this?

Note: There can be multiple correct answers to this question.

    • Set the StringFormat in the Style of all controls that need this behavior

    • Use a ValueConverter to format the output and use it in the binding declaration of the Content property

    • User a the StringFormat parameter to format the output in the binding declaration of the Content property

    • None of the mentioned


Which of the following can you use to simplify the INotifyPropertyChanged implementation and usage?

Note: There can be multiple correct answers to this question.

    • Use [CallerMemberName] in the parameter declaration of the method that calls the PropertChangedEvent so that you don't need to explicitly declare the name of the property.

    • Use a base class that already has the INotifyPropertyChanged interface implementation.

    • Use assembly weavers like Fody and PostSharp that can handle this implementation at build time for you.

    • None of the mentioned


You want to create a Command that is binded to a Button. This button can only be enabled if the thebooleanCanContinue property you have in your ViewModel is true. Which is the best alternative on how can you do this using MVVM?

    • Create an "if" statement in the Execute command method that returns if the CanContinue value is false

    • Use an EventHandler for the Click event and in this handler create an "if" statement in the that returns if the CanContinue value is false

    • return the CanContinue value in the CanExecute method of the command you created

    • Bind the CanContinue value to the IsEnabled property of the button

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