WPF Interview questions and Answers

Last update: 30 Mar 2020, 15 Questions
WPF Interview questions

WPF is an abbreviated form of Windows Presentation Foundation. It is the next-generation User Interface (UI) framework of Microsoft. WPF is used to create applications with better UX. Besides, WPF is an integral part of the .NET framework 3.0. It is used to combine 3D graphics, 2D graphics, documents, multimedia, and UI’s into a single framework. We have a number of WPF interview questions that will help you to crack WPF interviews.

Advantages of WPF

  • Provides attractive and rich-featured UI
  • Easier animation and special effects
  • WPF builds on DirectX rather than on WinAPI
  • The framework uses a vector graphics system
  • WPF support flow document model
  • Supports “rich data visualization”

Most Frequently Asked WPF Interview questions

Here in this article, we will be listing frequently asked WPF Interview questions and Answers with the belief that they will be helpful for you to gain higher marks. Also, to let you know that this article has been written under the guidance of industry professionals and covered all the current competencies.

1. What is WPF and why it is used?

WPF stands for Windows Presentation Foundation which is used to create interactive and attraction applications. It is a vector-based rendering engine that uses hardware-accelerated modern graphic cards.

This is used to create faster, scalable, dynamic resolution-independent and interactive UI.

2. What is the difference between WinForms and WPF?

WinForms stands for Windows Forms which is a Graphical User Interface (GUI). It is a subset of Microsoft .NET mono-framework. It provides a platform for users to develop applications for handheld devices.

WPF stands for Windows Presentation Foundation which is a rendering engine used for the development of interactive UI.

3. What are static and dynamic resources in WPF?

In WPF, resources are the objects that can be used anywhere in the WPF application for customization. In WPF resources are of two types namely-

1. Static Resources- These are the resources which cannot be manipulated or modified during runtime. These can be evaluated for once by the implicit element which refers during XAML loading.

2. Dynamic Resources- These are the resources which can be manipulated and modified during runtime. These resources can be evaluated during runtime.

4. What is the use of relay command in WPF?

In WPF relay command is used to bind and integrate commands directly to the properties of ViewModel.

5. What is WPF MVVM?

In WPF, MVVM stands for Model View ViewModel which is an architectural pattern used for presentation Model design pattern. The operational working of MVVM is based on MVC (Model-View-Controller). With the help of MVVM, client applications leverage the core characteristics of the WPF framework. With the help of this model, developers can build applications with fewer technical difficulties.

6. What are the different triggers in WPF?

Triggers are used to perform an action and to change the property value of the application. In WPF there are five triggers namely-

  • Property Trigger
  • Multi Trigger
  • Event Trigger
  • MultiData Trigger
  • Data Trigger
7. What are Freezable objects in WPF?

Freeable objects in WPF are distinct kind of object which posses two states.

  • Frozen
  • Unfrozen.

These objects can be used for the improvement of the performance level of the applications.

8. What is Prism in WPF?

Prism is a platform or a framework which is used to develop scalable, flexible, maintainable, dynamic, loosely coupled XAML application in WPF.

9. What are the types of windows in WPF?

There are three types of windows in WPF framework-

  • Navigate Window
  • Page Window
  • Normal Window
10. Why we need dependency property in WPF?

In WPF dependency property is used to extend CLR property. This is a special type of functionality that WPF supports. A class in which dependency property is defined can be inherited with the use of DependencyObject class.

Latest version- WPF 4.5

We have provided a collection of WPF Interview Questions that have been asked frequently in the WPF interviews.

Disadvantages of WPF
  • WPF runs on Windows 2000 or lower version
  • WPF's inbox control suite is far more limited than WinForms
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