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單項(xiàng)選擇題

You are developing a Windows Presentation Foundation (WPF) application to play audio files. You add MediaElement mediaElement1 and a Button control named btnPlayAudio to the design surface. The MediaElement co.. audio file. The LoadedBehavior attribute is set to Manual.
You add the following code to the main Window.

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 constructor of the main window ?（）

A.
B.
C.
D.

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單項(xiàng)選擇題

You are developing a Windows Presentation Foundation (WPF) application
The application is for commercial use and requires a valid license key to be entered. You create a project type of Class Library code to validate license keys
You need to ensure that the user enters a valid license key during installation of the software.
Which deployment should reference the class library?（）

A. Click Once
B. Setup Project
C. XBAP
D. XCopy

單項(xiàng)選擇題

You are developing a Windows Presentation Foundation (WPF) application.
You are implementing a test strategy for the application.
You need to ensure that the test class can repeat user input.
From which base class should the test class inherit?（）

A. AutomationElementIdentifier
B. AutomationPeer
C. Keyboard
D. UICues

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