单选题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?（）ADragAction.CancelBDragAction.DropCDragDropEffects.NoneDDragDropEffects.All
单选题
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
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