樹視圖不顯示數據

我一直在試圖重現這個例子：http://www.codeproject.com/KB/WPF/TreeViewWithViewModel.aspx 樹視圖不顯示數據

出於某種原因，我的TreeView的是完全無法顯示任何數據，我想不通爲什麼（我沒有得到任何錯誤，不要」不知道如何正確調試）。這是我的代碼：

MainWindow.XAML

<Window x:Class="Tryout.MainWindow" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:local="clr-namespace:Tryout.domain" 
    Title="MainWindow" Height="350" Width="525" Loaded="Window_Loaded"> 
<TreeView Name="treeViewFiles" HorizontalAlignment="Left" Margin="10,10,0,12" Width="200" ClipToBounds="True"> 
    <TreeView.Resources> 
     <HierarchicalDataTemplate DataType="{x:Type local:Directory}" ItemsSource="{Binding Children}"> 
      <Label Content="{Binding Path=Name}"/> 
     </HierarchicalDataTemplate> 
     <DataTemplate DataType ="{x:Type local:File}"> 
      <TextBlock Text="{Binding Path=Name}" /> 
     </DataTemplate> 
    </TreeView.Resources> 
</TreeView>

MainWindow.XAML.cs

namespace Tryout 
{ 
    public partial class MainWindow : Window 
    { 
     public MainWindow() 
     { 
      InitializeComponent(); 
     } 

     private void Window_Loaded(object sender, RoutedEventArgs e) 
     { 
      Directory rootDirectory = new Directory("Root"); 
      rootDirectory.Children.Add(new Directory("Subdirectory 1")); 
      rootDirectory.Children.Add(new Directory("Subdirectory 2")); 
      ((Directory)rootDirectory.Children[1]).Children.Add(new File("The only file")); 

      treeViewFiles.ItemsSource = rootDirectory.Children; 
     } 
    } 
}

File.cs

namespace Tryout.domain 
{ 
    public class File : INotifyPropertyChanged 
    { 
     public string Name; 

     public File(String _name) 
     { 
      Name = _name; 
     } 

     #region INotifyPropertyChanged Members 

     public event PropertyChangedEventHandler PropertyChanged; 

     #endregion 
    } 
}

Directory.cs

namespace Tryout.domain 
{ 
    public class Directory : File 
    { 
     public List<File> Children = new List<File>(); 

     public Directory(String _name) : base(_name) { } 
    } 
}

來源

2011-12-18 ChristopherS