單項(xiàng)選擇題

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

微信掃碼免費(fèi)搜題