<Window x:Class="WpfRouteEvent.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <StackPanel>
            <TextBox></TextBox>
        </StackPanel>
    </Grid>
</Window>

從上面的代碼中可以看出，Window、Grid、StackPanel、TextBox其實就是XAML界面的邏輯樹。

二、什么是可視樹

可視樹是由界面上可見的元素構(gòu)成的，這些元素主要是由從Visual或者Visual3D類中派生出來的類。

上面代碼中的Window、Grid、StackPanel、TextBox它們本身就包含一些由Visual或者Visual3D類派生出的一些可視樹的元素來組成的。

三、邏輯樹和可視樹的遍歷

邏輯樹遍歷使用LogicalTreeHelper類。
可視樹遍歷使用VisualTreeHelper類。

演示遍歷邏輯樹和可視樹

1、XAML界面左邊顯示邏輯樹，右邊顯示可視樹，代碼如下：

<Window x:Class="WpfRouteEvent.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <DockPanel>
            <Button DockPanel.Dock="Top" Click="Button_Click" Content="獲取邏輯樹和可視樹"></Button>
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition></ColumnDefinition>
                    <ColumnDefinition></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <DockPanel Grid.Column="0">
                    <TextBlock DockPanel.Dock="Top" Text="邏輯樹"></TextBlock>
                    <TreeView Name="tvLogicTree"></TreeView>
                </DockPanel>
                <DockPanel Grid.Column="1">
                    <TextBlock DockPanel.Dock="Top" Text="可視樹"></TextBlock>
                    <TreeView Name="tvVisualTree"></TreeView>
                </DockPanel>
            </Grid>
        </DockPanel>

    </Grid>
</Window>

2、添加類，用于遍歷整個XAML界面的邏輯樹和可視樹

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace WpfRouteEvent
{
    public class WpfTreeHelper
    {
        static string GetTypeDescription(object obj)
        {
            return obj.GetType().FullName;
        }

        /// <summary>
        /// 獲取邏輯樹
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static TreeViewItem GetLogicTree(DependencyObject obj)
        {
            if (obj == null)
            {
                return null;
            }
            //創(chuàng)建邏輯樹的節(jié)點
            TreeViewItem treeItem = new TreeViewItem {Header=GetTypeDescription(obj),IsExpanded=true };

            //循環(huán)遍歷，獲取邏輯樹的所有子節(jié)點
            foreach (var child in LogicalTreeHelper.GetChildren(obj))
            {
                //遞歸調(diào)用
                var item = GetLogicTree(child as DependencyObject);
                if (item != null)
                {
                    treeItem.Items.Add(item);
                }
            }

            return treeItem;
        }

        /// <summary>
        /// 獲取可視樹
        /// </summary>
        /// <param name="obj"></param>
        /// <returns></returns>
        public static TreeViewItem GetVisualTree(DependencyObject obj)
        {
            if (obj == null)
            {
                return null;
            }

            TreeViewItem treeItem = new TreeViewItem { Header=GetTypeDescription(obj),IsExpanded=true};

            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
            {
                var child = VisualTreeHelper.GetChild(obj, i);
                var item = GetVisualTree(child);
                if (item != null)
                {
                    treeItem.Items.Add(item);
                }
            }

            return treeItem;
        }
    }
}

3、在按鈕的點擊事件中將獲取的邏輯樹和可視樹添加到XAML界面中

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfRouteEvent
{
    /// <summary>
    /// MainWindow.xaml 的交互邏輯
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            this.tvLogicTree.Items.Add(WpfTreeHelper.GetLogicTree(this));
            this.tvVisualTree.Items.Add(WpfTreeHelper.GetVisualTree(this));
        }
    }
}

4、點擊按鈕，界面運行效果