WPF 树视图蓝调。我想选择一个项目

我正在尝试选择一个 TreeViewItem。现在，我可以访问包含的 TreeViewItem 并告诉它展开，以便我可以选择它的孩子。如果它已经展开，一切都很好，如果没有，那么我运行以下代码：

EventHandler selector = new EventHandler(delegate
    {
        if (selectedDirectoryTreeItem.ItemContainerGenerator.Status == GeneratorStatus.ContainersGenerated)
        {
            TreeViewItem want = selectedDirectoryTreeItem.ItemContainerGenerator.ContainerFromItem(dirWeWantSelected) as TreeViewItem;
            if (want == null)
                return;

                want.IsSelected = true;
            // selectedDirectoryTreeItem.ItemContainerGenerator.StatusChanged -= selector;
        }
    });
selectedDirectoryTreeItem.ItemContainerGenerator.StatusChanged += selector;  

所以我的问题是，为什么它不选择？想要永远为空。我正在互联网上寻找另一种方法来做到这一点，但如果有人能向我解释这一点那就太酷了

我个人总是发现将 Selected 属性粘贴到模型对象中，然后将 TreeViewItem Selected 属性绑定到模型的 Selected 属性是最简单的方法。这是一些代码：

Model

public class Data : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    public Data()
    {
        DataItems = new List<Data>();
    }

    public string Name { get; set; }

    private bool _selected;
    public bool Selected
    {
        get { return _selected; }
        set
        {
            _selected = value;
            OnPropertyChanged("Selected");
        }
    }

    public List<Data> DataItems { get; set; }

    private void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
    }
}

XAML

<Window x:Class="WpfApplication1.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:WpfApplication1"
    xmlns:controls="clr-namespace:MyControls;assembly=MyControls"
    Title="Window1">  
    <Window.Resources>
        <Style x:Key="CustomTreeViewItem" TargetType="TreeViewItem">
            <Setter Property="IsSelected" Value="{Binding Path=Selected, Mode=TwoWay}" />
            <Setter Property="IsExpanded" Value="True" />
        </Style>
    </Window.Resources>
    <DockPanel Background="Transparent">   
        <TreeView x:Name="_tvTest" DockPanel.Dock="Left" ItemContainerStyle="{StaticResource CustomTreeViewItem}" Width="300" >
            <TreeView.ItemTemplate>
                <HierarchicalDataTemplate DataType="{x:Type local:Data}" ItemsSource="{Binding DataItems}">
                    <TextBlock Text="{Binding Name}" Padding="2" />
                    <HierarchicalDataTemplate.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Name}" Padding="2" />
                        </DataTemplate>
                    </HierarchicalDataTemplate.ItemTemplate>
                </HierarchicalDataTemplate>
            </TreeView.ItemTemplate>
        </TreeView>

        <Button Content="Select Random TreeView Item" Click="Button_Click" Height="50" Width="200" />
    </DockPanel>
</Window>

代码隐藏

public partial class Window1 : Window
{
    private Random _random;
    private List<Data> _dataItems;

    public Window1()
    {
        InitializeComponent();
        _dataItems = Init();
        _tvTest.ItemsSource = _dataItems;
        _random = new Random(5);
    }

    private List<Data> Init()
    {
        List<Data> dataItems = new List<Data>();
        for (int i = 1; i <= 10; i++)
        {
            Data d1 = new Data();
            d1.Name = "Data:" + i.ToString();
            for (int j = 1; j <= 4; j++)
            {
                Data d2 = new Data();
                d2.Name = "Data:" + i.ToString() + j.ToString();
                d1.DataItems.Add(d2);
            }
            dataItems.Add(d1);
        }
        return dataItems;
    }

    private void Button_Click(object sender, RoutedEventArgs e)
    {
        int index = _random.Next(0, 9);
        int subIndex = _random.Next(0, 3);

        if (subIndex == 0)
            _dataItems[index].Selected = true;
        else
            _dataItems[index].DataItems[subIndex - 1].Selected = true;
    }
}