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WPF

65 WPF interview questions

Only coding challenges
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WPF Basics


  • 1.

    What is Windows Presentation Foundation (WPF) and what are its main components?

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  • 2.

    Can you explain the difference between a UserControl and a CustomControl in WPF?

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  • 3.

    Describe the WPF threading model and how it deals with UI and background operations.

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  • 4.

    What is the purpose of the Dispatcher class in WPF?

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  • 5.

    Explain how WPF achieves resolution independence.

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  • 6.

    Outline the purpose of Dependency Properties in WPF.

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  • 7.

    What is a ContentPresenter in WPF and where would you typically use it?

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  • 8.

    Describe the role of the VisualTree and LogicalTree in a WPF application.

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  • 9.

    How does WPF support high-DPI settings?

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XAML


  • 10.

    What is XAML and why is it used in WPF applications?

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  • 11.

    Explain the syntax for defining a namespace in XAML.

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  • 12.

    How do you use property elements and attribute syntax in XAML?

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  • 13.

    Can you define a XAML event handler for a button click in WPF?

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  • 14.

    What are Markup Extensions in XAML and can you provide an example?

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  • 15.

    Describe the purpose of the x:Key directive in XAML.

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  • 16.

    How does XAML handle collections, like a ListBox’s ItemsSource?

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  • 17.

    What are attached properties in XAML and give an example of their usage?

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  • 18.

    How would you apply a DataTemplate in XAML?

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Data Binding


  • 19.

    What is data binding in WPF and why is it important?

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  • 20.

    Can you differentiate between OneWay and TwoWay binding?

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  • 21.

    Explain the role of INotifyPropertyChanged in data binding.

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  • 22.

    How would you implement a value converter in WPF and why would you use one?

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  • 23.

    Describe how to bind an element’s property to another element’s property.

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  • 24.

    What are Collection Views in the context of Data Binding?

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  • 25.

    How do you use the UpdateSourceTrigger property in data bindings?

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  • 26.

    What is the purpose of RelativeSource in data bindings?

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Controls and User Interface


  • 27.

    How do you create a custom user interface control in WPF?

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  • 28.

    What is a RoutedEvent in WPF?

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  • 29.

    Discuss the process of adding a scrollbar to a StackPanel.

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  • 30.

    Can you explain how WPF achieves separation between the visual representation and logic of controls?

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  • 31.

    How do you implement a ListView with grouping in WPF?

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  • 32.

    Explain the difference between Grid and StackPanel layout controls.

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  • 33.

    What are DependencyObject and UIElement in the context of WPF controls?

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Styles, Templates, and Resources


  • 34.

    What is a Style in WPF and how is it used?

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  • 35.

    Explain the difference between StaticResource and DynamicResource.

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  • 36.

    How do you define and apply a ControlTemplate in WPF?

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  • 37.

    What are triggers in a WPF style and how do you use them?

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  • 38.

    Discuss how WPF resource dictionaries are used for managing styles and assets.

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Animations and Media


  • 39.

    How would you go about creating a simple animation in WPF?

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  • 40.

    What is the purpose of the Storyboard in WPF animations?

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  • 41.

    Describe how to play a video in a WPF application.

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MVVM Pattern


  • 42.

    What is MVVM and why is it a good fit for WPF applications?

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  • 43.

    How do you bind a ViewModel to a View in WPF?

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  • 44.

    Explain the ICommand interface and its importance in MVVM.

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  • 45.

    What are the benefits of using MVVM in large applications?

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  • 46.

    How can you implement navigation between different views in an MVVM application?

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Events and Commands


  • 47.

    How do you handle events in WPF and what are the advantages of using the RoutedEvent system?

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  • 48.

    Explain how commands are used in WPF and list a few built-in commands.

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  • 49.

    Describe the process of creating a custom command in WPF.

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Performance Optimization


  • 50.

    What methodologies can be applied to improve WPF application performance?

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  • 51.

    Explain UI virtualization and its benefits.

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  • 52.

    How would you diagnose and resolve performance issues in a WPF application?

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Advanced Features


  • 53.

    Can you discuss how 3D graphics are implemented in WPF?

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  • 54.

    How do you perform interop with Windows Forms in a WPF application?

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  • 55.

    Describe how you would implement custom drawing in WPF.

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Best Practices and Design Patterns


  • 56.

    What are some common design patterns used in WPF applications other than MVVM?

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  • 57.

    How do you manage memory effectively in a WPF application?

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  • 58.

    What are some best practices when structuring a WPF project?

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WPF and .NET Core


  • 59.

    What are the main differences between WPF on the .NET Framework and WPF on .NET Core?

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  • 60.

    How does the new .NET Core 3+ impact a WPF application’s deployment strategy?

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  • 61.

    Explain how to migrate a WPF application from the .NET Framework to .NET Core.

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  • 62.

    Can you discuss any features that are exclusive to WPF in .NET Core?

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  • 63.

    What tools and techniques would you use to ensure cross-platform compatibility for a WPF application moving to .NET Core?

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  • 64.

    How do you handle package management for a WPF application in .NET Core?

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  • 65.

    What are the performance implications of migrating a WPF application to .NET Core?

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