单选题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?（）AtxtInput.TextChanged+=Audit_TextChanged;BAddHandler(TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);CEventManager.RegisterClassHandler(typeof(TextBox), TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true);DEventManager.RegisterClassHandler(typeof(TextBox), TextBox.TextChangedEvent, new RoutedEventHandler (Audit_TextChanged), false);
单选题
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);
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