65 Must-Know WPF Interview Questions and Answers 2024

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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65 WPF interview questions

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

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

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

What is the purpose of the Dispatcher class in WPF?

Explain how WPF achieves resolution independence.

Outline the purpose of Dependency Properties in WPF.

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

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

How does WPF support high-DPI settings?

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

Explain the syntax for defining a namespace in XAML.

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

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

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

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

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

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

How would you apply a DataTemplate in XAML?

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

Can you differentiate between OneWay and TwoWay binding?

Explain the role of INotifyPropertyChanged in data binding.

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

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

What are Collection Views in the context of Data Binding?

How do you use the UpdateSourceTrigger property in data bindings?

What is the purpose of RelativeSource in data bindings?

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

What is a RoutedEvent in WPF?

Discuss the process of adding a scrollbar to a StackPanel.

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

How do you implement a ListView with grouping in WPF?

Explain the difference between Grid and StackPanel layout controls.

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

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

Explain the difference between StaticResource and DynamicResource.

How do you define and apply a ControlTemplate in WPF?

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

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

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

What is the purpose of the Storyboard in WPF animations?

Describe how to play a video in a WPF application.

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

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

Explain the ICommand interface and its importance in MVVM.

What are the benefits of using MVVM in large applications?

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

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

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

Describe the process of creating a custom command in WPF.

What methodologies can be applied to improve WPF application performance?

Explain UI virtualization and its benefits.

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

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

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

Describe how you would implement custom drawing in WPF.

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

How do you manage memory effectively in a WPF application?

What are some best practices when structuring a WPF project?

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

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

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

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

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

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

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

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

What is the purpose of the `Dispatcher` class in WPF?

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

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

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

How would you apply a `DataTemplate` in XAML?

Can you differentiate between `OneWay` and `TwoWay` binding?

How do you use the `UpdateSourceTrigger` property in data bindings?

What is the purpose of `RelativeSource` in data bindings?

What is a `RoutedEvent` in WPF?

Discuss the process of adding a scrollbar to a `StackPanel`.

How do you implement a `ListView` with grouping in WPF?

Explain the difference between `Grid` and `StackPanel` layout controls.

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

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

Explain the difference between `StaticResource` and `DynamicResource`.

How do you define and apply a `ControlTemplate` in WPF?

What is the purpose of the `Storyboard` in WPF animations?

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

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

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

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

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

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

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

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