单项选择题

You are developing a Windows Presentation Foundation (W……

You are developing a Windows Presentation Foundation (WPF) application that displays opportunities from List<T.. class named Lead. The Lead class contains the properties Title and Revenue.
You add a DataGrid control named dgQualifiedLeads to the MainWindow.xaml file. You set the ItemsSource property to Leads as follows.

You need to ensure that CollectionViewSource is used to filter the list to display only Lead objects with revenue ...
What should you do ?（）

A.
B.
C.
D.

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