WPF 简单实现面包屑

框架使用.NET4 至 .NET6；
Visual Studio 2022;
面包屑展示使用控件如下：
- Button 做首页按钮，当点击时回到首页。
- ItemsControl 做面包屑 Item 展示，DataTemplate -> Hyperlink > 做点击时回到当前 Item。
ListView 展示当前 Item 的子项，也可以换做 ListBox 控件或其他。.

1）创建 BreadCrumbBarExample.xaml 代码如下:

<wd:Window x:Class="WpfApp1.BreadCrumbBarExample"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:wd="https://github.com/WPFDevelopersOrg/WPFDevelopers"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="BreadCrumbBarExample - 面包屑" Height="450" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Grid Margin="0,5">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="Auto"/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <Button Style="{StaticResource PathButton}" ToolTip="主页"
                    Click="btnHome_Click" Cursor="Hand">
                <Path Data="M804.571 566.857v274.286q0 14.857-10.857 25.714t-25.714 10.857h-219.429v-219.429h-146.286v219.429h-219.429q-14.857 0-25.714-10.857t-10.857-25.714v-274.286q0-0.571 0.286-1.714t0.286-1.714l328.571-270.857 328.571 270.857q0.571 1.143 0.571 3.429zM932 527.429l-35.429 42.286q-4.571 5.143-12 6.286h-1.714q-7.429 0-12-4l-395.429-329.714-395.429 329.714q-6.857 4.571-13.714 4-7.429-1.143-12-6.286l-35.429-42.286q-4.571-5.714-4-13.429t6.286-12.286l410.857-342.286q18.286-14.857 43.429-14.857t43.429 14.857l139.429 116.571v-111.429q0-8 5.143-13.143t13.143-5.143h109.714q8 0 13.143 5.143t5.143 13.143v233.143l125.143 104q5.714 4.571 6.286 12.286t-4 13.429z"
                      Stretch="Uniform" Width="15"
                      Fill="{StaticResource PrimaryTextSolidColorBrush}"/>
            </Button>
            <ScrollViewer HorizontalScrollBarVisibility="Auto"
                          Grid.Column="1">
                <ItemsControl ItemsSource="{Binding BreadCrumbBars}">
                    <ItemsControl.ItemsPanel>
                        <ItemsPanelTemplate>
                            <VirtualizingStackPanel Orientation="Horizontal"/>
                        </ItemsPanelTemplate>
                    </ItemsControl.ItemsPanel>
                    <ItemsControl.ItemTemplate>
                        <DataTemplate>
                            <TextBlock VerticalAlignment="Center">
                                <Hyperlink Click="Hyperlink_Click"
                                           Cursor="Hand">
                                    <Run Text="{Binding Name}"/>
                                </Hyperlink>
                                <Run Text=" > "/>
                            </TextBlock>
                        </DataTemplate>
                    </ItemsControl.ItemTemplate>
                </ItemsControl>
            </ScrollViewer>
        </Grid>
        <ListView ItemsSource="{Binding Files}" Grid.Row="1"
                  SelectedItem="{Binding FilesSelectedItem}"
                  Name="FilesListView">
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Name" 
                                    DisplayMemberBinding="{Binding Name}" 
                                    Width="200"/>
                </GridView>
            </ListView.View>
        </ListView>
    </Grid>
</wd:Window>

2） BreadCrumbBarExample.xaml.cs 代码如下:

BreadCrumbBars 记录面包屑的值。
Files 记录当前的子项。
当点击面包屑则删除当前至末尾的所有数据 List.RemoveRange(0, List.Count - 0);。

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading;
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.Shapes;

namespace WpfApp1
{
    /// <summary>
    /// BreadCrumbBarExample.xaml 的交互逻辑
    /// </summary>
    public partial class BreadCrumbBarExample : INotifyPropertyChanged
    {
        private ObservableCollection<FolderItem> files;
        public ObservableCollection<FolderItem> Files
        {
            get { return files; }
            set { files = value; OnPropertyChanged(); }
        }

        private ObservableCollection<FolderItem> breadCrumbBars;
        public ObservableCollection<FolderItem> BreadCrumbBars
        {
            get { return breadCrumbBars; }
            set { breadCrumbBars = value; OnPropertyChanged(); }
        }

        private FolderItem filesSelectedItem;
        public FolderItem FilesSelectedItem
        {
            get { return filesSelectedItem; }
            set { filesSelectedItem = value; OnPropertyChanged(); }
        }

        public BreadCrumbBarExample()
        {
            InitializeComponent();
            FilesListView.SelectionChanged += FilesListView_SelectionChanged;
            DataContext = this;
            BreadCrumbBars = new ObservableCollection<FolderItem>();
            Files = new ObservableCollection<FolderItem>();
            Loaded += BreadCrumbBarExample_Loaded;
        }

        private void BreadCrumbBarExample_Loaded(object sender, RoutedEventArgs e)
        {
            GetHome();
        }
        private void btnHome_Click(object sender, RoutedEventArgs e)
        {
            Files.Clear();
            GetHome();
            var array = BreadCrumbBars.ToList();
            array.RemoveRange(0, BreadCrumbBars.Count - 0);
            BreadCrumbBars = new ObservableCollection<FolderItem>(array);
        }
        private void Hyperlink_Click(object sender, RoutedEventArgs e)
        {
            var hyperlink = (Hyperlink)sender;
            if (hyperlink == null) return;
            var model = (FolderItem)hyperlink.DataContext;
            if (model == null) return;
            LinkFolder(model);
        }

       
        private void FilesListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (FilesSelectedItem == null) return;
            BreadCrumbBars.Add(FilesSelectedItem);
            AddFolder(FilesSelectedItem);
            
        }
        private void LinkFolder(FolderItem folderItem)
        {
            var index = BreadCrumbBars.IndexOf(folderItem);
            if (index < BreadCrumbBars.Count)
            {
                var array = BreadCrumbBars.ToList();
                if(index == 0)
                {
                    index += 1;
                    array.RemoveRange(index, BreadCrumbBars.Count - index);

                }
                else
                    array.RemoveRange(index, BreadCrumbBars.Count - index);
                BreadCrumbBars = new ObservableCollection<FolderItem>(array);
            }
            AddFolder(folderItem);
        }

        void AddFolder(FolderItem folderItem)
        {
            try
            {
                if (folderItem == null) return;
                FilesListView.SelectedIndex = -1;
                FilesListView.SelectedItem = null;
                Files.Clear();
                var list = new ObservableCollection<FolderItem>();
                if (File.Exists(folderItem.FullName)) return;
                var directory = new DirectoryInfo(folderItem.FullName + @"\");
                if (directory.GetDirectories() == null) return;
                foreach (var item in directory.GetDirectories())
                {
                    var fileInfo = new FolderItem() { Name = item.Name, FullName = item.FullName };
                    if (list.Contains(fileInfo)) continue;
                    Files.Add(fileInfo);
                }
                foreach (var item in directory.GetFiles())
                {
                    var fileInfo = new FolderItem() { Name = item.Name, FullName = item.FullName };
                    if (list.Contains(fileInfo)) continue;
                    Files.Add(fileInfo);
                }
            }
            catch (Exception)
            {

                throw;
            }
        }

        void GetHome()
        {
            DriveInfo[] allDrives = DriveInfo.GetDrives();
            foreach (DriveInfo drive in allDrives)
            {
                if (drive.IsReady == true)
                {
                    var fileInfo = new FolderItem() { Name = drive.Name, FullName = drive.Name };
                    Files.Add(fileInfo);
                }
            }
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged([CallerMemberName] string propertyName = "")
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
      
    }
    public class FolderItem
    {
        public string Name { get; set; }
        public string FullName { get; set; } = string.Empty;
    }

}

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