WPF DataBound 树视图展开/折叠

Posted 2023-02-19

【中文标题】WPF DataBound 树视图展开/折叠

【英文标题】：WPF DataBound treeview expand / collapse

【发布时间】：2010-12-15 14:47:23

【问题描述】：

我只是想找到一种方法来通过它们绑定到的对象来控制TreeView 节点的展开/折叠。该对象有一个IsExpanded 属性，我想用它来显示TreeView 节点本身基于该属性展开或折叠。

这是我的代码：

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>
    <Grid>
        <TreeView ItemsSource="Binding" />
    </Grid>
</Window>

【参考方案1】：

想出了解决办法：

<Style TargetType="x:Type TreeViewItem">
    <Setter Property="IsExpanded" Value="Binding IsNodeExpanded"/>
</Style>

因此，样式获取绑定到 TreeViewItem 的对象并查看其 IsNodeExpanded 属性，并将该值分配给 TreeViewItem.IsExpanded 属性。如果添加 Mode=TwoWay，它们会相互通知（TreeViewItem 会在对象展开时通知对象）。

【讨论】：

大约晚了（9 年后） - 但是您在 XML 中的哪个位置放置了 Style 元素？

@NirMH 它应该在TreeView.Resources

记得输入Mode=TwoWays 以获得全部功能

也有用的链接***.com/questions/1487144/autoexpand-treeview-in-wpf