Microsoft MCTS 70-511

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Microsoft 70-511 Prüfungsthemen:

Microsoft TS: Windows Applications Development with Microsoft .NET Framework 4 70-511 Prüfungsfragen mit Lösungen

1. You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You want to add an audio player that plays .wav or .mp3 files when the user clicks a button.
You plan to store the name of the file to a variable named SoundFilePath.
You need to ensure that when a user clicks the button, the file provided by SoundFilePath plays.
What should you do?

A) Use the following code segment from the PlaySound() Win32 API function and call the
PlaySound function in the button onclick event.
<sysimport(dll : = "winmm.dll")>
Public Shared Function PlaySound(SoundFilePath As [String], Module As Long, dwFlags
As Long) As Long
End Function
B) Reference the Microsoft.DirectX Dynamic Link Libraries. Use the following code
segment in the button onclick event.
Dim song As Audio = New Song (SoundFilePath)
song.CurrentPosition B song.Duration
song.Play()
C) Write the following code segment in the button onclick event.
Dim player As New System.Media.SoundPlayer(SoundFilePath)
player.Play()
D) Write the following code segment in the button onclick event.
Dim player As New MediaPlayer()
player.Open(New URI(SoundFilePath), UriKind.Relative)
player.Play()

2. You develop a Windows Presentation Foundation (WPF) application. This application is used to output data trends to customer service representatives.
A data trend analysis is performed in a function named UpdateTrendData. The trend analysis is a long-running process.
The application contains the following code segment.
Class MainWindow: Window {
private void UpdateData(object arg)
{
double data = UpdateTrendData();
... } }
UpdateData is currently invoked on the UI thread when the form is first displayed. You need to process the data in a manner that does not cause the UI to freeze. What should you do?

A) Use ThreadPool.SetMaxThreads(2, 2) and invoke UpdateData.
B) Use this.Dispatcher.Beginlnvoke to invoke UpdateData passing in the priority of Normal.
C) Use this.Dispatcher.BeginInvoke to invoke UpdateData passing in the priority of Background.
D) Use ThreadPool.QueueUserWorkItem to invoke UpdateData.

3. You are developing a Windows Presentation Foundation (WPF) application to play audio files. You add a MediaElement control named mediaElementl and a Button control named btnPlayAudio to the design surface. The MediaElement control Source attribute is set to an audio file. The LoadedBehavior attribute is set to Manual.
You add the following code to the main window.
Sub playCoinroand_Executed (ByVal sender As Object,
ByVal e As RoutedEventArgs)
MediaElenient 1.Play ()
End Sub
You set the command of the button to MediaCommands.Play.
You need to ensure that the application will play the audio file when the button is pressed.
What should you add to the constructor of the main window?

A) Dim playCommand As RoutedUICommand = New RoutedUICommand()
AddHandler playCommand.CanExecuteChanged,
New EventHandler(AddressOf playCommand_Executed) Me . CommandBindings .
Add (New CommandBinding (playCommand) )
B) Dim piayCommand As RoutedCommand = New RoutedCommand()
AddHandler playCommand.CanExecuteChanged,
New EventHandler(AddressOf playComrnand_Executed)
Me.CommandBindings.Add(New CoinmandBinding (playCommand))
C) Dim playCommand As CoinmandBinding =
New CoinmandBinding (MediaCommands.Play)
AddHandler playCommand.Executed,
New ExecutedRoutedEventHandler(
AddressOf playCommand_Executed)
Me.CommandBindings.Add(playCommand)
D) Dim playCommand As CoinmandBinding =
New CommandBinding(MediaCommands.Play)
AddHandler playCommand.CanExecute,
New CanExecuteRoutedEventHandler(
AddressOf playCommand_Executed)
Me.CommandBindings.Add(playCommand)

4. You are developing a Windows Presentation Foundation (WPF) application.
You plan to deploy the WPF application by using ClickOnce. The application will be
associated to files that have an extension of .abc.
You need to ensure that when a user opens the application by double-clicking an .abc file,
a TextBlock named txtBlock1 displays the path of the file. Which code should you use?

A) Option B
B) Option C
C) Option D
D) Option A

5. You are developing a Windows Presentation Foundation (WPF) application for managing student information. You place a Button control named btnSort and a DataGrid control named dgStudents on the design surface of the MainWindow.xaml file. You create a Student class with two properties: FirstName and LastName. You create the following code segment in the constructor of the main window.

The DataGrid control displays the list of students unsorted.
You need to ensure that the list of students is sorted by last name.
Which code segment should you add to the click event handler of the Button control?

A) Dim sortedStudents As IEnumerable(Of Student) Students.orderBy (Function (s) s.LastName) dgStudents.ItemsSource = sortedStudents
B) Dim sortedStudents As IEnnumerable(Of Student) = Students.OrderBy(Function(s) s.LastName).ToList() dgstudents.ltemssource = sortedStudents
C) Students.Reversed dgStudents.ItemsSource = Students
D) Students.Sort() dgStudents.ItemsSource = Students

Fragen und Antworten: