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- 单项选择题 You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application. The application uses the drag-and-drop functionality. You need to ensure that the drag-and-drop operation is stopped when a user moves the cursor outside the boundaries of the application form. Which enumeration member should you use?（）
A、 DragAction.Cancel
B、 DragAction.Drop
C、 DragDropEffects.None
D、 DragDropEffects.All
- A
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