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Question 7: You are developing a Silverlight 4 application.
The application contains an XAML page that defines the following Grid control.
<Grid Name="gridBody" >
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<TextBlock Text="Employee Info" />
<TextBlock Text="Please enter employee info" Grid.Row="1" Height="20" VerticalAlignment="Top" />
<TextBox x:Name="EmpInfo" Grid.Row="1" Margin="0,25,0,0" TextWrapping="Wrap" />
...
</Grid>
The codebehind file for myPage.xaml contains the following code segment. (Line numbers are included
for reference only.)
01 public myPage()
02 {
03 InitializeComponent()
04
05 UserControl control = new MyCustomControl()
06
07 }
You need to replace the contents of the second row of gridBody with a user control of the
MyCustomControl type.
Which code segment should you insert at line 06?
A. gridBody.Children.Insert(1, control)
B. gridBody.RowDefinitions.Remove(gridBody.RowDefinitions[1])
gridBody.Children.Insert(1, control)
C. gridBody.Children.Clear()
Grid.SetRow(control, 1)
gridBody.Children.Add(control)
D. List<UIElement> remove = gridBody.Children.Where(c => c is FrameworkElement &&
Grid.GetRow((FrameworkElement)c) == 1).ToList()
foreach (UIElement element in remove)
{
gridBody.Children.Remove(element)
}
Grid.SetRow(control, 1)
gridBody.Children.Add(control)
Correct Answer: D