You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application contains a composite user control that includes a TextBox control named txtInput. The user control will be hosted in a window and will have handlers for the text-changed event of txtInput. You need to ensure that the application meets the following requirements: Creates a text-changed event handler named Audit_TextChanged for the txtInput control. Executes Audit_TextChanged even when specific handlers mark the event as handled. Which code segment should you add to the constructor of the user control?（）A.txtInput.TextChanged+=Audit_TextChanged;B.AddHandler(TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);C.EventManager.RegisterClassHandler(typeof(TextBox), TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);D. EventManager.RegisterClassHandler(typeof(TextBox), TextBox.TextChangedEvent, new RoutedEventHandler (Audit_TextChanged), false);

单项选择题

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
The application contains a composite user control that includes a TextBox control named txtInput.
The user control will be hosted in a window and will have handlers for the text-changed event of txtInput.
You need to ensure that the application meets the following requirements:
Creates a text-changed event handler named Audit_TextChanged for the txtInput control.
Executes Audit_TextChanged even when specific handlers mark the event as handled.
Which code segment should you add to the constructor of the user control?（）

A.txtInput.TextChanged+=Audit_TextChanged;
B.AddHandler(TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);
C.EventManager.RegisterClassHandler(typeof(TextBox), TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);
D. EventManager.RegisterClassHandler(typeof(TextBox), TextBox.TextChangedEvent, new RoutedEventHandler (Audit_TextChanged), false);

MCPD(70-511)