Online Access Free 070-511 Practice Test

You are developing a Windows Presentation Foundation (WPF) application.
An event triggers a workflow such that a parent control executes the event handlers before the child controls.
You need to ensure that if a parent control's event handler encounters an error, the subsequent handlers are not called.
What should you do?

• A.Use handlers for a bubbling routed event and mark the event as handled in the case of a problem.
• B.Use handlers for a bubbling routed event and set the Handled property of the RoutedEventArgs object to true in the catch portion of a try-catch-finally code block.
• C.Use handlers for a tunneling routed event and mark the event as handled in the case of a problem.
• D.Use handlers for a tunneling routed event and mark the event as handled in the finally portion of a try-catch-finally code block.

You are developing a Windows Presentation Foundation (WPF) application.
The application has several visual controls on a main page.
You need to restyle all of the Ul-related elements on the main page at run time.
Which class should you use to reference all these elements in a single call?

• A.visualTreeHelper
• B.UIElement
• C.LogicalTreeHelper
• D.ContentElement

You are developing a Windows Presentation Foundation (WPF) application. The application contains the following markup.

You need to ensure that the Filter combo box is hidden when the expander is collapsed. What should you do?

• A.Add the following DataTrigger element to the ComboBox control.
  DataTrigger Binding=" {Binding ElementName=Products, Path=isExpanded>
  "Value="False">
  <Setter Property="UIElement.Visibility"
  Value="Collapsed"/>
  </DataTrigger>
• B.Add the following DataTrtgger element to the Expander control.
  <DataTrigger Binding="{Binding ElementName=Filter, Path=Visibility}= Value="Collapsed">
  <Setter Property="Expander.IsExpanded"
  Value="False" />
  </DataTrigger>
• C.Add the following DataTrigger element to the Expander control.
  <DataTrigger Binding="{Binding ElementName=Filter, Path=isExpanded} " Value="False">
  <Setter Property="UIElementVisibility"
  Value="Collapsed" />
  </DataTrigger>
• D.Add the following DataTrigger element to the ComboBox control.
  <DataTrigger Binding= "{Binding ElementName=Products, Path=Visibility}"
  Value="Collapsed">
  <Setter Property="Expander.IsExpanded"
  Value="False"/>
  </DataTrigger>

You are developing a Windows Presentation Foundation (WPF) application. You add several TextBox controls within a StackPanel control. You next add several Image controls within a second StackPanel control.
During testing, you discover that some of the textboxes do not appear in the proper layout.
You need to quickly search for the textboxes and view their properties to identify which ones are incorrect.
What should you do?

• A.Open the QuickWatch window and select the Text Visualizer.
• B.Open the Locals window and select the WPF Tree Visualizer.
• C.Open the Autos window and select the HTML Visualizer.
• D.Open the Watch window and select the XML Visualizer.

You develop a Windows Presentation Foundation (WPF) application. This application is used to output data trends to customer service representatives.
You use threading to keep the UI responsive. You have a function named UpdateUI that updates all of the UI components.
You use the following code to update the _Data variable. (Line numbers included for reference only.)

You need to update the user interface without knowing if you are on the UI thread.
Which code segment should you insert at line 06?

• A.Me. Dispatcher.VerifyAccess ()
  UpdateUI()
• B.Me.Dispatcher.VerifyAccess()
  Dim [function] = New Action(AddressCf UpdateUI)
  Dim args() As Object = Nothing
  Me .Dispatcher .BeginlnvoJce ([function], args)
• C.If (Me.Dispatcher.CheckAcce33()) Then
  Dim [function] = New Action(Addre33Cf UpdateUI)
  Dim args() As Object = Nothing
  Me.Dispatcher.Beginlnvoke([function], args)
  Else
  UpdateUI()
  End If
• D.If (Me. Dispatcher. CheckAccess())
  Then UpdateUI()
  Else
  Dim (function] = New Action(AddressCf OpdateUI)
  Dim args() As Object = Nothing
  Me .Dispatcher ,BeginInvoIce ( [function; , args)
  End If