Interview Questions.

Q1. Explain Object Element Syntax In Xaml?

To instantiate a CLR elegance or structure through putting forward an XML element, an XAML markup syntax is used.  This syntax is referred as Object Element Syntax.

Q2. Why Should Wpf Be Preferred Over Adobe Flash?

WPF is a extra recent generation and for this reason has the latest improvement equipment. It supports a broader range of programming languages and has a strong manage reuse.

Q3. What Is The Basic Difference Between Events And Commands In The Mvvm Model?

Commands are greater effective and are superb to apply instead of events. Actions are deeply related with the event source and, consequently, the occasions cannot be reused without problems. But instructions make it viable to successfully preserve a couple of movements at one area after which reuse them as per our requirement.

Q4. What Is The Way To Determine If A Freezable Object Is Frozen?

“IsFrozen” belongings of the object may be used to determine if the freezable object is frozen.

Q5. What Are The Various X: Prefix Used In Xaml Language?

X: Key à It sets a unique key for every resource in a Resource Dictionary

x: Classà It specifies the CLR ( Common Language Runtime) namespace and class call for the elegance that gives code

x: Name à It specifies a run-time object name for the example that exist in run time code after an item element is processed

x: Static à It allows a reference that returns a static fee which in any other case an XAML like minded property

x: Type à It constructs a Type reference primarily based on the type name

Q6. How Is Silverlight Different From Wpf Browser Application?

One of the main variations is that .NET framework is needed for running WPF browser packages on the consumer device. But Silverlight runs the use of handiest the plug-in. Another factor of distinction is that applications made in WPF rely on the OS as .NET Framework only runs on Windows. On the other hand, the Silverlight plug-in may be set up on those OSs also, which are not Windows.

Q7. Explain What Is The Function X: Key Directive In Xaml?

X: Key uniquely identifies factors that are created and referenced in an XAML described dictionary. By adding an x: Key cost to an XAML object detail a resource within the useful resource dictionary may be diagnosed and is the maximum common way to become aware of.

Q8. How Is System.Windows.Media.Visual Dll Utilized In Wpf?

It is used on every occasion a requirement for developing custom person interface arises. It is a drawing object, which gives commands for making an object. These instructions encompass opacity and so on. Of the drawing. The Visual magnificence additionally bridges the functionalities of WPF controlled classes and the MilCore.Dll.

Q9. What Are The Four General Kinds Of Xaml Elements?

The 4 general type of XAML elements are:

Root Elements

Panel Elements

Control Elements

Geometric Elements

Q10. What Is The Method To Force Close A Tooltip, Which Is Currently Visible?

It can be closed through putting the tooltip’s IsOpen property to false.

Q11. What Are Freezable Objects In Wpf?

An item, which has its nation locked down, in order that it turns into unchangeable, is known as a freezable item. Such objects perform higher. It is also safer if they are required to be shared between threads.

Q12. What Is Wpf?

WPF is the state-of-the-art presentation API through Microsoft Windows. It is 2D and three-D image engine.

Its abilities include:-

All the not unusual person controls. For example, check containers, buttons, sliders and many others.

Supports drift and fix layout documents

all of the capability of Flash and HTML

Data binding

Multimedia

Q13. What Are Attached Properties In Wpf?

Attached houses are essentially Dependency Properties that lets in the attachment of a value to any random object.

Q14. Is Mdi Supported In Wpf?

MDI isn't always supported in WPF. UserControl can be used to present the same capability as MDI.

Q15. Why Is It Better To Wrap Items In Combobox Item?

It has some crucial properties like IsSelected and IsHighlighted and also some essential events like Selected and Unselected. ComboBoxItem is a content material manipulate and is hence very useful for adding easy strings to a ComboBox.

Q16. What Is Attribute Syntax In Xaml?

In XAML, characteristic syntax units a cost for a assets or names the event handler for an event, by means of declaring an attribute on an element.The characteristic fee must be enclosed inside  quotation marks (“).

For instance,

< Button Background = “Black” Foreground “Red” Content = “This is an operating button”/>

XAML

Q17. Can Windows Service Be Created Using Wpf?

No, Windows Services can't be created the use of WPF. WPF is a presentation language. Windows services want unique permissions to execute a few GUI related capabilities. Therefore, if it does no longer get the desired permissions, it gives mistakes.

Q18. What Are The Various Layout Panels In Wpf?

They are:

Stack Panel

Grid Panel

Canvas Panel

Dock Panel

Wrap Panel

Q19. Explain Content Properties Xaml?

XAML represents a language feature wherein a class can allot precisely one in every of its residences as XAML property

Q20. What Is Xaml Namespace?

Namespace may be described as an surroundings or an summary container used to hold a logical grouping of precise identifiers or symbols.

Q21. Name The Methods Present In The Dependencyobject?

It has 3 items, specifically:

SetValue

ClearValue

GetValue

Q22. In Xaml How Graphic Components Are Specified?

In XAML, photo additives are precise with via open or closed tags with attributes.

For example,

Tag with contents

<Button>

Click

</Button>

Tag without contents

< Button/>

Q23. Mention The Advantage Of Using Xaml?

The advantage of the use of XAML is:

XAML code is clear to study, and they may be brief

Separation of fashion designer code and logic

Tools like expression blend used for graphical design require XAML as supply

It in reality separates the roles of clothier and developer

Q24. What Should A Root Element Of An Xaml Document Contain?

In XAML document, the basis element consists best sure factors, and those factors are Window, a Canvas or panels.

Q25. Write About Prism?

PRISM is a framework for developing complex applications for WPF, Silverlight or Windows Phone. PRISM utilizes MVVM, IC, Command Patterns, DI and Separation of Concerns to get unfastened coupling.

Q26. What Is The Inotifypropertychanged Interface?

The InotifyPropertyChanged notifies customers, generally folks that are binding, if the fee of a assets gets modified. It has an occasion, referred to as PropertyChanged, which receives raised everytime a belongings of Model object is modified.

Q27. Explain Routed Events In Wpf?

An occasion, that may invoke handlers on a couple of listeners found in an detail tree, instead of the unmarried item which referred to as the event, is called a Routed event.

Q28. How Can You Set A Property Attribute As A Literal String And Not A Mark Up Extension?

To keep away from mark up extension you need to use an empty pair of curly braces like

Content = “ This isn't always a markup extension”/>

Q29. Is It Right To Say That Wpf Has Replaced Directx?

No, WPF can by no means update DirectX. WPF can not be used to create games with beautiful pix. WPF is supposed to be a replacement for home windows form, not DirectX.

Q30. Explain What Is Markup Extension In Xaml?

Markup extensions are placeholders in XAML which are used to remedy assets at runtime. A markup extension allows you to increase XAML and using characteristic syntax you may also set any property that can be set in XAML.The cause of the mark up extension is to manner a string and return an object. Some of the standard markup extensions are xNull, x: Array, :StaticResource  and DynamicResource.

Q31. What Is Data Binding With Xaml?

Data binding provides a simple way to display and have interaction with information. An example will show how you can do records binding in XAML.  The binding in XAML is performed by using binding…. Syntax.

Q32. What Is An Adorner?

They are a special kind of FrameworkElement that provide visible clues to the user. They also are used to add handles to factors and deliver facts about the country of a manage. Adorners are sure to the UIElement and are rendered on a surface that lies above the element, that is adorned. This floor is referred to as an AdornerLayer. Adorners are basically located fairly to the bounded detail.

Q33. What Is Xbap?

XBAP is the abbreviated shape of XAML Browser Application. It lets in WPF programs to run inside internet browsers. Installation of .NET framework on the consumer system is a prerequisite for strolling WPF programs. But hosted applications are not given complete admission to the purchaser’s machine and are completed in a sandbox environment. Using WPF, such packages can also be created, which run directly inside the browser. These packages are called XBAP.

Q34. How Can Elements In A Listbox Be Sorted?

Sorting may be accomplished by using the usage of a belongings of the ItemsCollection object. ItemsCollection consists of an attribute, SortDescriptions, which holds System.ComponentModel.SortDescription times. Every SortDescription example defines how the elements must be taken care of and indicates if the type is descending or ascending.

For instance, this code types elements of ContentControl on the premise of their word count number assets:

myItemsControl.Items.SortDescriptions.Add(new SortDescription(“WordCount”, ListSortDirection.Descending));

Q35. What Is The Unit Of Measurement In Wpf?

All measurements are made in device-unbiased pixels, or logical pixels. One pixel is 1/96th part of an inch. These logical pixels are always mentioned as double, this enables them to have a fractional value too.

Q36. What X: Prefix Indicates In Xaml?

The X: prefix is used to map the XAML namespace in templates.

Q37. How Can Listbox Be Made To Scroll Smoothly?

ListBox is configured to scroll on an item-via-object basis with the aid of default. This is depending on the height of each detail and the scrolling action, consequently, giving a hard feeling. Better way is to configure scrolling motion in order that it shifts items via a few pixels no matter their peak. This is achieved by means of placing the ScrollViewer.CanContentScroll assets to “fake”. This will, but, make the ListBox lose the virtualization belongings.

Q38. Write The Differences Between Dynamicresource And Staticresource.

The maximum basic difference is that StaticResource evaluates the useful resource one time only, but DynamicResource evaluates it whenever the resource is needed. And because of this reason, DyanamicResource is heavy on the system however it makes pages or windows load faster

Q39. How Is Mvvm Different From Mvc?

MVC stands for Model-View Controller and.MVVM stands for Model-View ViewModel.

In MVVM, View Model is used in preference to a controller. This View Model is gift below the UI layer. It exhibits the command objects and records that the view requires. It acts like a field object from which view gets its actions and records.

Q40. In What Sense Are Wpf And Silverlight Similar?

Silverlight and WPF are similar within the sense that they both use XAML and proportion the identical code, syntax and libraries.

Q41. What Are The Different Kinds Of Routed Events In Wpf?

There are three styles of Routed occasions in WPF.

They are:

Direct – This occasion can only be raised by using the detail in which it was originated.

Tunneling – This occasion is first raised through the detail in which it turned into originated after which it receives raised by means of every consecutive box inside the visual tree.

Bubbling – This event is first raised by means of the uppermost field within the visual tree and then gets raised by means of every consecutive container lying below the uppermost one, until it reaches the detail it wherein it turned into originated.

Q42. Define Path Animations In Wpf?

Path animation is a sort of animation wherein the animated object follows a direction set by using the Path geometry.

Q43. Describe Custom Control Briefly?

Custom Control widens the capabilities of present controls. It includes a default fashion in Themes/Generic.Xaml and a code record. It is the first-rate way to make a control library and also can be styled or templated.

Q44. Explain What Is Xaml? What Is The Difference Between Xml And Xaml?

XAML stands for eXtensible Application Markup Language. It is the language used to instantiate.NET items.  It is the language developed by using Microsoft to write user interface for next technology applications.

XML is designed to shop data or to paintings with the saved data, while XAML is the extended version of XML used for.NET programming.

Q45. How Can Command-line Arguments Be Retrieved In A Wpf Application?

The most desired approach for this is to name System.Environment.GetCommandLineArgs at any random factor in the application.

Q46. Explain Mvvm Pattern?

MVVM sample divides the UI code into three basic components:

Model – It represents a set of lessons, which contain statistics obtained from databases.

View – It is the code that is of the same opinion with the visible illustration of the records.

ViewModel – It is the layer that binds View and Model together. It provides this data in a way, which is easy to recognize. It additionally controls how View interacts with the utility.

Q47. What Is Difference Between Page And Window Controls In Wpf?

The basic difference is that Window Control presides over Windows Application even as Page Control presides over the hosted Browser Applications. Also, Window manage may include Page Control, however the opposite cannot show up.

Q48. Explain How You Can Display Different Data At Run Time And Design Time?

One way of displaying information at run time and layout time is to claim your facts in XAML.

Another manner of doing it's miles through declaring it in XAML via the use of numerous records attributes from the dressmaker XML namespace.  With a d: prefix, this namespace is typically declared.

Xmlns: d= http://schemas.Microsoft.Com/expression/mixture/2008

Q49. Is It Possible To Use Windows Forms In A Wpf Application?

Yes, Windows shape can be used in WPF. Windows form can seem as a WPF pop. The controls of this Window form may be positioned besides WPF controls in a WPF page by way of using the capabilities of the WindowsFormsHost manipulate that comes preinstalled.

Q50. How To Make A Tooltip Appear While Hovering Over A Disabled Element?

For this reason, the ShowOnDisabled belongings can be used. It belongs to the ToolTipService elegance.