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You are developing a Windows Presentation Foundation (WPF) application. An event triggers a workflow such that a parent control executes the event handlers before the child controls. You need to ensure that if a parent controls event handler encounters an error, the subsequent handlers are not called. What should you do?（）
- A、 Use handlers for a tunneling routed event and mark the event as handled in the case of a problem.
- B、 Use handlers for a tunneling routed event and make the event as handled in the finally portion of a try-catch-finally code block.
- C、 Use handlers for a bubbling routed event and mark the event as handled in the case of a problem.
- D、 Use handlers for a bubbling routed event and set the Handled property of the RoutedEventArgs object to true in the catch portion of a try-catch-finally code block.
参考答案
更多 “ You are developing a Windows Presentation Foundation (WPF) application. An event triggers a workflow such that a parent control executes the event handlers before the child controls. You need to ensure that if a parent controls event handler encounters an error, the subsequent handlers are not called. What should you do?（）A、Use handlers for a tunneling routed event and mark the event as handled in the case of a problem.B、Use handlers for a tunneling routed event and make the event as handled in the finally portion of a try-catch-finally code block.C、Use handlers for a bubbling routed event and mark the event as handled in the case of a problem.D、Use handlers for a bubbling routed event and set the Handled property of the RoutedEventArgs object to true in the catch portion of a try-catch-finally code block.” 相关考题
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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: AddHandler(TextBox.TextChangedEvent, new RoutedEventHandler(Audit_TextChanged), true); Which of the following statments are TRUE ?（）A、A text-changed event handler, named Audit_TextChanged, was Created for the txtInput control.B、Audit_TextChanged will stop running because the event is marked as handled by certain event handlers.C、Even through the event is marked handled by certain event handlers, Audit_TextChanged will still run.D、Audit_TextChanged will continue to run until the event is marked as handled.
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单选题You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application has multiple data entry windows. Each window contains controls that allow the user to type different addresses for shipping and mailing. All addresses have the same format. You need to ensure that you can reuse the controls. What should you create?（）A
a user controlB
a data templateC
a control templateD
a control that inherits the Canvas class
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多选题You are developing a Windows Forms Application by using the .NET Framework 3.5.You plan to create a customized Print Preview dialog box in the application. You need to ensure that users can preview their documents before printing. Which two actions should you perform？（）AAdd a PrintPreviewDialog control to the form.BAdd a PrintPreviewControl control to the form.CCreate and initialize a PrintDocument object on the form and then implement the PrintPage event handler.DCreate and initialize a PrintDocument object on the form and then implement the BeginPrint event handler.ESet the Document property of the PrintPreviewDialog control to the PrintDocument instance that must be printed.
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单选题You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You create a window that contains a Button control and a MenuItem control. Both controls are labeled "Add sugar." The Command properties of the Button and MenuItem controls are set to the same RoutedCommand named AddSugarCommand. You write the following code segment. private void CanAddSugar (object sender, CanExecuteRoutedEventArgs e) { ... } You need to ensure that when the CanAddSugar method sets e.CanExecute to false, the MenuItem and Button controls are disabled. What should you do?（）A
Create an event handler for the CanExecuteChanged event of the AddSugarCommand command.Call the CanAddSugar method from within the event handler.B
Inherit the AddSugarCommand from the RoutedUICommand class instead of the RoutedCommand class. Call the CanAddSugar method from within the constructor of the AddSugarCommand command.C
Add a CommandBinding object to the CommandBinding property of the MenuItem control. Set the CanExecute property of the CommandBinding object to the CanAddSugar method.D
Add a CommandBinding object to the CommandBindings property of the window. Set the Command property of CommandBinding to the AddSugarCommand command. Set the CanExecute property of the CommandBinding object to the CanAddSugar method.
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多选题You are developing a Windows Forms Application by using the .NET Framework 3.5.You plan to create a customized Print Preview dialog box in the application.You need to ensure that users can preview their documents before printing.Which two actions should you perform？（）AAdd a PrintPreviewDialog control to the form.BAdd a PrintPreviewControl control to the form.CCreate and initialize a PrintDocument object on the form and then implement the PrintPage event handler.DCreate and initialize a PrintDocument object on the form and then implement the BeginPrint event handler.ESet the Document property of the PrintPreviewDialog control to the PrintDocument instance that must be printed.
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