Microsoft
70-518 · Question #243
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You add a ListBox control to the application. The ListBox control is data-bound to an instance of a…
The correct answer is D. Extend the ObservableCollection<Product> class in the ProductList class. See the full explanation below for the reasoning.
Question
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. You add a ListBox control to the application. The ListBox control is data-bound to an instance of a custom collection class of the Product objects named ProductList. You need to ensure that changes to ProductList are automatically reflected in the ListBox control. What should you do?
Options
- AImplement the INotifyPropertyChanged interface in the Product class.
- BImplement the IQueryable<Product> interface in the ProductList class.
- CExtend the DependencyObject class in the Product class.
- DExtend the ObservableCollection<Product> class in the ProductList class.
How the community answered
(37 responses)- A3% (1)
- B8% (3)
- C11% (4)
- D78% (29)
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