问 WPF DataBound树视图展开/折叠

EN

我只是想找到一种方法，通过 TreeView 节点所绑定的对象来控制它们的展开/折叠。该对象有一个 IsExpanded 属性，我想用它来显示基于该属性展开或折叠的 TreeView 节点本身。

下面是我的代码：

C#：

public partial class Window2 : Window
    public Window2()
        InitializeComponent();
        this.DataContext = new List<Parent>() { Base.GetParent("Parent 1"), Base.GetParent("Parent 2") };
public class Base
    public string Name { get; set; }
    public bool IsExpanded { get; set; }
    public static Parent GetParent(string name)
        Parent p = new Parent() { Name = name };
        p.Children.Add(new Child() { Name = "Child 1", GrandChildren = new ObservableCollection<GrandChild>() { new GrandChild() { Name = "Grandchild 1" } } });
        p.Children.Add(new Child() { Name = "Child 2", GrandChildren = new ObservableCollection<GrandChild>() { new GrandChild() { Name = "Grandchild 1" } } });
        p.Children.Add(new Child() { Name = "Child 3", GrandChildren = new ObservableCollection<GrandChild>() { new GrandChild() { Name = "Grandchild 1" } } });
        return p;
public class Parent : Base
    public ObservableCollection<Child> Children { get; set; }
    public Parent()
        this.Children = new ObservableCollection<Child>();
public class Child : Base
    public ObservableCollection<GrandChild> GrandChildren { get; set; }
    public Child()
        this.GrandChildren = new ObservableCollection<GrandChild>();
public class GrandChild : Base
}

XAML：

<Window x:Class="HeterogeneousExperimentExplorer.Window2"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:HeterogeneousTree"
    Title="Window2" Height="300" Width="300">
    <Window.Resources>
        <HierarchicalDataTemplate DataType="{x:Type local:Parent}" ItemsSource="{Binding Children}">
            <TextBlock Text="{Binding Name}" />
            <HierarchicalDataTemplate.ItemTemplate>
                <HierarchicalDataTemplate DataType="{x:Type local:Parent}" ItemsSource="{Binding GrandChildren}">
                    <TextBlock Text="{Binding Name}" />
                    <HierarchicalDataTemplate.ItemTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding Name}" />
                        </DataTemplate>
                    </HierarchicalDataTemplate.ItemTemplate>
                </HierarchicalDataTemplate>
            </HierarchicalDataTemplate.ItemTemplate>
        </HierarchicalDataTemplate>
    </Window.Resources>