單項(xiàng)選擇題

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);

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單項(xiàng)選擇題

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You write the following code fragment.

You create an event handler named StackPanel_PreviewTextInput. You also have a collection of strings named Keywords.
You need to ensure that TxtBoxA and TxtBoxB do not contain any of the strings in the Keywords collections.
Which code segment should you use?（）

A.
B.
C.
D.