WPF, почему привязка шрифта не работает?

Question

Я играл с этим кодом, меняя некоторые проблемы с выравниванием. Теперь привязка с шрифтом терпит неудачу. Зачем. Нужна помощь Спасибо.

<Window x:Class="FontViewer.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="Font Viewer" Height="480" Width="600"> 
    <DockPanel Margin="8" LastChildFill="False">  
     <Border DockPanel.Dock="Top" 
       CornerRadius="6" 
       BorderThickness="1" 
       BorderBrush="Gray" 
       Background="LightGray" 
       Padding="8" 
       Margin="0 0 0 8"> 
      <TextBlock FontSize="14" 
         TextWrapping="Wrap"> 
       Select a font to view from the list below. 
       You can change the text by typing in the region at the bottom. 
      </TextBlock> 
     </Border> 
     <ListBox x:Name="FontList" 
       DockPanel.Dock="Left" 
       ItemsSource="{x:Static Fonts.SystemFontFamilies}" 
       Width="160"/> 
     <StackPanel Margin="8 0 8 8" DockPanel.Dock="Bottom"> 
      <TextBlock Text="{Binding ElementName=SampleText, Path=Text}" 
         FontFamily="{Binding ElementName=Fontlist, Path=SelectedItem}" 
         FontSize="10" 
         TextWrapping="Wrap" 
         Margin="0 0 0 4" 
         HorizontalAlignment="right" 
         VerticalAlignment="Bottom"/> 
      <TextBlock Text="{Binding ElementName=SampleText, Path=Text}" 
         FontFamily="{Binding ElementName=Fontlist, Path=SelectedItem}" 
         FontSize="16" 
         TextWrapping="Wrap" 
         Margin="0 0 0 4"/> 
      <TextBlock Text="{Binding ElementName=SampleText, Path=Text}" 
         FontFamily="{Binding ElementName=Fontlist, Path=SelectedItem}" 
         FontSize="24" 
         TextWrapping="Wrap" 
         Margin="0 0 0 4" 
         HorizontalAlignment="right"/> 
      <TextBlock Text="{Binding ElementName=SampleText, Path=Text}" 
         FontFamily="{Binding ElementName=Fontlist, Path=SelectedItem}" 
         FontSize="32" 
         TextWrapping="Wrap"/> 
     </StackPanel> 
     <TextBox x:Name="SampleText" 
       VerticalAlignment="Top" 
       MinLines="2" 
       Margin="8 0 0 0" 
       TextWrapping="Wrap" 
       ToolTip="Type here to change the priview text."> 
      The quick brown fox jumps over the lazy dog. 
     </TextBox> 
    </DockPanel> 

</Window> 

Answer 1

Вы случайно изменили <ListBox x:Name="Fontlist" в <ListBox x:Name="FontList".