单项选择题
You use Microsoft .NET Framework 4 to create a Windows Presentation Framework (WPF) application.
You plan to create a custom control that contains four text input fields.
Each of the text input fields within the control will contain a label.
You need to ensure that the text input fields within the control can be validated by using a regular expression validator.
Which class should you inherit from?（）
A. TextBox
B. TextElement
C. UIElement
D. UserControl
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单项选择题
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You add a custom command as a resource. The key of the command is saveCommand. You write the following code fragment. (Line numbers are included for reference only.) You need to ensure that saveCommand is executed when the user clicks the Button control. What should you do? （）
A.
B.
C.
D.
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单项选择题
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You create a game where a ball drops from the top to the bottom of a window. You plan to create a single animation for the game. You need to ensure that the animation shows the ball bounce. What should you do?（）
A. Use the KeySpline property of a SplineDoubleKeyFrame object.
B. Use the EasingFunction property of an EasingDoubleKeyFrame object.
C. Use the DecelerationRatio and AutoReverse properties of a StoryBoard object.
D. Use the DecelerationRatio and AccelerationRatio properties of a StoryBoard object. -
单项选择题
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application contains a form named frmMain that contains a button named btnSave. You create a ProgressBar control named saveProgress. Initially, saveProgress is not displayed on frmMain. When a user clicks btnSave, you have the following requirements: saveProgress is slightly visible after 0.2 seconds saveProgress is fully visible after 1 second You need to declare the corresponding storyboard. You write the following code fragment. (Line numbers are included for reference only.) Which code fragment should you insert at line 02 to complete the declaration?（）
A.
B.
C.
D.
