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Exam : Microsoft 70-502VBChinese
Title : TS: Microsoft .NET Framework 3.5 - Windows Presentation Foundation


1. 您正在使用 Microsoft .NET Framework 3.5 创建一个 Windows Presentation Foundation 应用程序。
您向 Window 元素中添加一个 CommandBinding 元素。该命令具有一个键盘笔势 Ctrl+H。Window 元素中包含下面的 MenuItem 控件。
<MenuItem Header="Highlight Content"
Command="local:CustomCommands.Highlight" />
您需要确保当焦点切换到不包含任何文本的 TextBox 控件时，MenuItem 控件处于禁用状态而且该命令不可执行。
您应该怎么办？
A. 在 TextBox 控件的 GotFocus 事件处理程序中，设置 MenuItem 控件的 IsEnabled 属性。
B. 将该命令的 CanExecute 属性设置为 Highlight_CanExecute。
将以下方法添加到该窗口的代码隐藏文件中。
Private Sub Highlight_CanExecute(ByVal sender As Object, _
ByVal e As CanExecuteRoutedEventArgs)
Dim txtBox As TextBox = CType(sender, TextBox)
e.CanExecute = (txtBox.Text.Length > 0)
End Sub
C. 将该命令的 CanExecute 属性设置为 Highlight_CanExecute。
将以下方法添加到该窗口的代码隐藏文件中。
Private Sub Highlight_CanExecute(ByVal sender As Object, _
ByVal e As CanExecuteRoutedEventArgs)
Dim txtBox As TextBox
txtBox = CType(e.Source, TextBox)
e.CanExecute = (txtBox.Text.Length > 0)
End Sub
D. 将该命令的 CanExecute 属性设置为 Highlight_CanExecute。
将以下方法添加到该窗口的代码隐藏文件中。
Private Sub Highlight_CanExecute(ByVal sender As Object, _
ByVal e As CanExecuteRoutedEventArgs)
Dim Menu As MenuItem = CType(e.Source, MenuItem)
Dim txtBox As TextBox = CType(Menu.CommandTarget, TextBox)
Menu.IsEnabled = (txtBox.Text.Length > 0)
End Sub
Answer: C

2. 您正在使用 Microsoft .NET Framework 5 创建一个 Windows Presentation Foundation 应用程序。
该应用程序定义一个 BrowserWindow 类。BrowserWindow 类的每个实例允许用户在一个单独的窗口中浏览网站。在打开新的浏览器窗口时，用户将重定向到一个预定义的 URL。
您编写以下代码段。
01 Private Sub OpenNewWindow(ByVal sender As Object, _
02 ByVal e As RoutedEventArgs)
03 Dim newWindowThread As New Thread(New _
04 ThreadStart(AddressOf NewThreadProc))
05
06 newWindowThread.Start()
07 End Sub
08 Private Sub NewThreadProc()
09
10 End Sub
您需要确保满足以下要求：
·在创建其他浏览器窗口时，应用程序的主窗口不被阻止。
·在应用程序的主窗口关闭时，应用程序即执行完毕。
您应该怎么办？
A. 在第 05 行处插入以下代码段。
newWindowThread.SetApartmentState(ApartmentState.STA)
newWindowThread.IsBackground = True
在第 09 行处插入以下代码段。
Dim newWindow As New BrowserWindow()
newWindow.Show()
Dim app As New Application()
app.Run(newWindow)
B. 在第 05 行处插入以下代码段。
newWindowThread.IsBackground = True
在第 09 行处插入以下代码段。
newWindowThread.SetApartmentState(ApartmentState.STA)
Dim newWindow As New BrowserWindow()
newWindow.Show()
Dim app As New Application()
app.Run(newWindow)
C. 在第 05 行处插入以下代码段。
newWindowThread.SetApartmentState(ApartmentState.STA)
newWindowThread.IsBackground = False
在第 09 行处插入以下代码段。
Dim newWindow As New BrowserWindow()
System.Windows.Threading.Dispatcher.Run()
newWindow.Show()
D. 在第 05 行处插入以下代码段。
newWindowThread.SetApartmentState(ApartmentState.STA)
newWindowThread.IsBackground = True
在第 09 行处插入以下代码段。
Dim newWindow As New BrowserWindow()
newWindow.Show()
System.Windows.Threading.Dispatcher.Run()
Answer: D

3. 您正在使用 Microsoft .NET Framework 3.5 创建一个 Windows Presentation Foundation 应用程序。
该应用程序使用若干个异步操作来计算显示给用户的数据。名为 tommorowsWeather 的操作执行将由其他操作使用的计算。
您需要确保 tommorowsWeather 以尽可能高的优先级运行。
您应该使用哪个代码段？
A. tomorrowsWeather.Dispatcher.BeginInvoke( _
System.Windows.Threading.DispatcherPriority.Normal, _
New OneArgDelegate(AddressOf UpdateUserInterface), weather)
B. tomorrowsWeather.Dispatcher.BeginInvoke( _
System.Windows.Threading.DispatcherPriority.DataBind, _
New OneArgDelegate(AddressOf UpdateUserInterface), weather)
C. tomorrowsWeather.Dispatcher.BeginInvoke( _
System.Windows.Threading.DispatcherPriority.Send, _
New OneArgDelegate(AddressOf UpdateUserInterface), weather)
D. tomorrowsWeather.Dispatcher.BeginInvoke( _
System.Windows.Threading.DispatcherPriority.Render, _
New OneArgDelegate(AddressOf UpdateUserInterface), weather)
Answer: C

4. 您使用 Microsoft .NET Framework 3.5 创建了一个 Windows Presentation Foundation 应用程序。该应用程序名为 EnterpriseApplication.exe，通过网络运行。
您使用设计器在用户作用域级别向 Settings.settings 文件中添加 WindowSize 参数和 WindowPosition 参数。窗口的大小和位置是从用户配置文件读取的。
该应用程序必须针对执行它的用户保持最初的窗口大小和位置。
您需要确保满足以下要求：
·每个用户的窗口大小都保存在用户配置文件中。
·在用户退出应用程序后保留用户设置。
您应该使用哪个配置设置？
A. Private Sub OnClosing(ByVal sender As Object, ByVal e _
As System.ComponentModel.CancelEventArgs)
My.Settings.Default.WindowPosition = New Point(Me.Left, Me.Top)
My.Settings.Default.WindowSize = New Size(Me.Width, Me.Height)
My.Settings.Default.Save()
End Sub
B. Private Sub OnClosing(ByVal sender As Object, ByVal e As _
System.ComponentModel.CancelEventArgs)
Dim appKey As RegistryKey = _
Registry.CurrentUser.CreateSubKey("SoftwareEnterpriseApplication")
Dim settingsKey As RegistryKey = _
appKey.CreateSubKey("WindowSettings")
Dim windowPositionKey As RegistryKey = _
settingsKey.CreateSubKey("WindowPosition")
Dim windowSizeKey As RegistryKey = _
settingsKey.CreateSubKey("WindowSize")
windowPositionKey.SetValue("X", Me.Left)
windowPositionKey.SetValue("Y", Me.Top)
windowSizeKey.SetValue("Width", Me.Width)
windowSizeKey.SetValue("Height", Me.Height)
End Sub
C. Private Sub OnClosing(ByVal sender As Object, ByVal e As _
System.ComponentModel.CancelEventArgs)
Dim doc As New System.Xml.XmlDocument()
doc.Load("EnterpriseApplication.exe.config")
Dim nodePosition As System.Xml.XmlNode = _
doc.SelectSingleNode("//setting[@name='WindowPosition']")
nodePosition.ChildNodes(0).InnerText = String.Format("{0},{1}", _
Me.Left, Me.Top)
Dim nodeSize As System.Xml.XmlNode = _
doc.SelectSingleNode("//setting[@name='WindowSize']")
nodeSize.ChildNodes(0).InnerText = String.Format("{0},{1}", _
Me.Width, Me.Height)
doc.Save("UserConfigDistractor2.exe.config")
End Sub
D. Private Sub Window_Closing(ByVal sender As Object, ByVal e As _
System.ComponentModel.CancelEventArgs)
Dim sw As New StreamWriter("EnterpriseApplication.exe.config", True)
sw.WriteLine("<EnterpriseApplication.Properties.Settings>")
sw.WriteLine("<setting name=""WindowSize"" serializeAs=""String"">")
sw.WriteLine(String.Format("<value>{0},{1}</value>", Me.Width, _
Me.Height))
sw.WriteLine("</setting>")
sw.WriteLine("<setting name=""WindowPosition"" _
serializeAs=""String"">")
sw.WriteLine(String.Format("<value>{0},{1}</value>", Me.Left, _
Me.Top))
sw.WriteLine("</setting>")
sw.WriteLine("</UserConfigProblem.Properties.Settings>")
sw.Close()
End Sub
Answer: A

5. 您正在使用 Microsoft .NET Framework 3.5 创建一个 Windows Presentation Foundation 应用程序。
您为该应用程序创建一个窗口。
您需要确保满足以下要求：
·使用 ListBox 控件以双列格式显示字符串数组。
·ListBox 控件中数据的流动方向为从左向右、自上向下。
您应该怎么办？
A. 使用按如下方式定义的 ListBox 控件。
<ListBox Name="myList">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<UniformGrid Columns="2"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
使用下面的 VB.NET 代码将字符串数组与 ListBox 控件关联。
myList.ItemsSource = arrayOfString
B. 使用按如下方式定义的 ListBox 控件。
<ListBox Name="myList">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
使用下面的 VB.NET 代码将字符串数组与 ListBox 控件关联。
myList.ItemsSource = arrayOfString
C. 使用按如下方式定义的 ListBox 控件。
<ListBox Name="myList">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<WrapPanel />
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
使用下面的 VB.NET 代码将字符串数组与 ListBox 控件关联。
myListView.ItemsSource = arrayOfString
D. 使用按如下方式定义的 ListBox 控件。
<ListBox Name="myList">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition />
<ColumnDefinition />
</Grid.ColumnDefinitions>
</Grid>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
</ListBox>
使用下面的 VB.NET 代码将字符串数组与 ListBox 控件关联。
myList.ItemsSource = arrayOfString
Answer: A