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WPF Interview Questions and Answers (67) - Page 1

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What is WPF?

Windows Presentation Framework is the new presentation API in WinFX. WPF is a two and three dimensional graphics engine. It has the following capabilities:- v Has all equivalent common user controls like buttons, check boxes sliders etc. v Fixed and flow format documents v Has all of the capabilities of HTML and Flash v 2D and 3D vector graphics v Animation v Multimedia v Data binding

What is XAML?

XAML (pronounced as Zammel) is a declarative XML-based language by which you can define object and properties in XML. XAML document is loaded by a XAML parser. XAML parser instantiates objects and set there properties. XAML describes objects, properties and there relation in between them. Using XAML you can create any kind of objects that means graphical or non-graphical. WPF parses the XAML document and instantiates the objects and creates the relation as defined by XAML.

What are attached properties?

These are dependency properties that belong to one class but can be used in another. Consider the below code snippet:-


4 7 9 Height and Width are regular properties of the Rectangle. But Canvas.Top and Canvas. Left is dependency property as it belongs the canvas class. Its used by the Rectangle to specify its position within Canvas.

What is a Routed event?

In a typical WPF application, it contains many elements. These elements exist in an element tree relationship witheach other. A routed event is a type of event that can invoke handlers on multiple listeners in an element tree,rather than just on the object that raised the event.

What are the core WPF assemblies?

The core WPF assemblies are,

WindowsBase.dll:- It defines the core types constituting the infrastructure of WPF API.

PresentationCore.dll:- Defines numerous types constituting foundation of WPF GUI layer.

PresentationFoundation.dll:- It defines WPF control types, animation & multimedia support, data binding suportand other WPF services.

Besides these three libraries WPF also uses an unmanaged binary called milcore.dll which acts as a bridgebetween WPF assemblies and DirectX runtime layer.

What is the use of System.Windows.Media namespace?

It is the root namespace to several other media related namespaces. It provides different types to work withanimations, 3D rendering, text rendering and other multimedia services.

What is WPF?


Microsoft has introduced WPF(Windows Presentation Foundation) API in .NET3.0 framework for the first time. WPFmerged all the unrelated APIs into a single unified object model. So if you want to use 3D graphics or multimediafor your application you do not use to need use different APIs. WPF provides all the functionalities you need todevelop richer GUI applications.

Using WPF we can develop GUI for both windows application and web application.

How to define a button USING XAML?

To define a button in WPD using XAML use the following syntax,

btnCaption

Example:-

Click Me

Here the element specifies the use of the Button class.

What is the use of "System.Windows.Markup" namespace in WPF?

The System.Windows.Markup namespace provides some helper classes for XAML code.

Which namespace provide classes for integration with WPF and Win32?

The "System.Windows.Interop" namespace provides classes for integration of WPF with Win32.


Which class of the WPF is the base class of all the user-interactive elements?

NOTE: This is objective type question, Please click question title for correct answer.

Which class is the base class of all the visual elements of WPF?


Control class of WPF is derived from which class?


The core classes for User Interface is located in which namespace?


Which namespace provide classes to work with images, sound, video, etc?

The System.Windows.Media namespace provide classes to work with images, sound, video, etc in WPF.

What is the use of System.Windows.Navigation namespace in WPF?

System.Windows.Navigation namespace contains different classes for navigation between windows.

What is 'One-way-to-Source ' binding property?

In One-way-to-Source binding when the target property changes, the source object gets updated.

Which namespace is used to work with 3D in WPF.


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Interview Questions and Answers Categories

The System.Windows.Media.Medi3D namespace is used to work with 3D.

Which of these is not a class defined by System.Windows.Shapes namespace?


Consider this XAML snippet What is the Backcolor of the Button


2 3 41


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