题目内容
（请给出正确答案）
A.余小姐将能够进行编辑并保存她所做的更改。
B. 余小姐将无法编辑和保存。
C. 余小姐将能够编辑和保存该文件，但是将无法更改唐小姐已更改的内容。
D. 唐小姐的版本将自动被签出，其他人将无法更改该文件。
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下列命令的执行结果为______。
？ AT("Window","Microsoft Windows"),substr("abcde",2,3)$"abcde"
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You plan to create a window that has a layout as shown in the following exhibit.You need to define the code fragment to create the window layout. You also need to ensure that the window contains a splitter line.Which code fragment should you use？（）
A.
B.
C.
D.
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.You plan to create a window that has a layout as shown in the following exhibit.You need to define the code fragment to create the window layout.Which code fragment should you use？（）
A.
B.
C.
D.
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.The application contains a window as shown in the following exhibit.You need to define a DockPanel control that fits the window.Which code fragment should you use？ （）
A.
B.
C.
D.
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.The application has a window with a canvas element.You need to draw a black line that has rounded edges at each end.Which code fragment should you use？（）
A.
B.
C.
D.
You use Microsoft Visual Studio 2010 and Microsoft .
NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You create a WPF window in the application.
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public class ViewModel
{
public CollectionView Data { get; set; }
}
public class BusinessObject
{
public string Name { get; set; }
}
The DataContext property of the window is set to an instance of the ViewModel class.
The Data property of the ViewModel instance is initialized with a collection of BusinessObject objects.
You add a TextBox control to the Window.
You need to bind the Text property of the TextBox control to the Name property of the current item of the CollectionView of the DataContext object.
You also need to ensure that when a binding error occurs, the Text property of the TextBox control is set to N/A .
Which binding expression should you use？（）
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