WPF DataBound树视图展开/折叠

本文介绍了WPF DataBound树视图展开/折叠的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我只是试图通过他们绑定的对象找到一种控制 TreeView 节点的扩展/崩溃的方法。该对象有一个 IsExpanded 属性，我想使用它来显示基于...的 TreeView 节点本身展开或折叠这个财产。

I'm just trying to find a way to control the expand / collapse of the TreeView nodes through the object they're bound to. The object has an IsExpanded property, and I want to use that to show the TreeView node itself expanded or collapsed based on that property.

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="schemas.microsoft/winfx/2006/xaml/presentation" xmlns:x="schemas.microsoft/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>

推荐答案

解决方案。真的很简单：

Came up with solution. Really simple:

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

因此，样式将对象绑定到TreeViewItem，并查看其IsNodeExpanded属性，并分配该值到TreeViewItem.IsExpanded属性。如果你添加了Mode = TwoWay，他们将通知对方（TreeViewItem会在对象扩展时告诉对象）。

So the style gets the object bound to the TreeViewItem and looks at its IsNodeExpanded attribute and it assigns that value to the TreeViewItem.IsExpanded property. If you add Mode=TwoWay, they'll notify each other (TreeViewItem will tell the object when it has been expanded).

谢谢！