1、基本应用
内容固定，在xaml中直接显示。
（1）、MainWindow.xaml代码
<TreeView><TreeViewItem Header="水果第一级"><TreeViewItem Header="水果第二级"><TreeViewItem Header="水果第三级"/></TreeViewItem></TreeViewItem><TreeViewItem Header="蔬菜第一级"/><TreeViewItem Header="肉类第一级"/></TreeView>
（2）、运行效果
2、同种类型数据动态加载
（1）、目录架构
（2）、TreeViewModel.cs
internal class TreeViewModel{public string Name {get; set; }public ObservableCollection<TreeViewModel> Children {get; set; } = new ObservableCollection<TreeViewModel>();}
（3）、TreeViewViewModel.cs
internal class TreeViewViewModel{private TreeViewModel treeViewModelRoot = new TreeViewModel();public TreeViewModel TreeViewModelRoot{get {return treeViewModelRoot; }set {treeViewModelRoot = value; }}public TreeViewViewModel(){InitTree();}private void InitTree(){for(int i = 0; i < 5; i++){TreeViewModel treeViewModel = new TreeViewModel();treeViewModel.Name = $"第{i+1}级";for(int j = 0; j < 5; j++){TreeViewModel treeViewModel1 = new TreeViewModel();treeViewModel1.Name = $"第{i + 1}-----{j + 1}级";treeViewModel.Children.Add(treeViewModel1);}TreeViewModelRoot.Children.Add(treeViewModel);}}}
（4）、MainWindow.xaml
<Window x:Class="WpfTreeViewApp.MainWindow"xmlns="/winfx//xaml/presentation"xmlns:x="/winfx//xaml"xmlns:d="/expression/blend/"xmlns:mc="/markup-compatibility/"xmlns:local="clr-namespace:WpfTreeViewApp"xmlns:viewModels="clr-namespace:WpfTreeViewApp.ViewModels"mc:Ignorable="d"Title="MainWindow" Height="450" Width="800"><Window.DataContext><viewModels:TreeViewViewModel x:Name="viewModel"/></Window.DataContext><TreeView ItemsSource="{Binding TreeViewModelRoot.Children}"><TreeView.ItemTemplate><HierarchicalDataTemplate ItemsSource="{Binding Children}"><TextBlock Text="{Binding Name}"/></HierarchicalDataTemplate></TreeView.ItemTemplate></TreeView></Window>
（5）、运行效果
3、不同类型数据动态加载
文件目录架构不变。
（1）、TreeViewModel.cs
internal class TreeViewModel{public ObservableCollection<TreeViewModel1> ChildrenModel1 {get; set; } = new ObservableCollection<TreeViewModel1>();}internal class TreeViewModel1{public string Name {get; set; }public ObservableCollection<TreeViewModel2> ChildrenModel2 {get; set; } = new ObservableCollection<TreeViewModel2>();}internal class TreeViewModel2{public string ID {get; set; }public ObservableCollection<TreeViewModel3> ChildrenModel3 {get; set; } = new ObservableCollection<TreeViewModel3>();}internal class TreeViewModel3{public string Description {get; set; }}
（2）、TreeViewViewModel.cs
internal class TreeViewViewModel{private TreeViewModel treeViewModelRoot = new TreeViewModel();public TreeViewModel TreeViewModelRoot{get {return treeViewModelRoot; }set {treeViewModelRoot = value; }}public TreeViewViewModel(){InitTree();}private void InitTree(){for(int i = 0; i < 5; i++){TreeViewModel1 treeViewModel1 = new TreeViewModel1();treeViewModel1.Name = $"Name第{i+1}级";for(int j = 0; j < 5; j++){TreeViewModel2 treeViewModel2 = new TreeViewModel2();treeViewModel2.ID = $"ID第{i + 1}-----{j + 1}级";for(int k = 0; k < 5; k++){TreeViewModel3 treeViewModel3 = new TreeViewModel3();treeViewModel3.Description = $"Description第{i + 1}--{j + 1}--{k + 1}";treeViewModel2.ChildrenModel3.Add(treeViewModel3);}treeViewModel1.ChildrenModel2.Add(treeViewModel2);}TreeViewModelRoot.ChildrenModel1.Add(treeViewModel1);}}}
（3）、MainWindow.xaml
<Window.DataContext><viewModels:TreeViewViewModel x:Name="viewModel"/></Window.DataContext><TreeView ItemsSource="{Binding TreeViewModelRoot.ChildrenModel1}"><TreeView.ItemTemplate><HierarchicalDataTemplate ItemsSource="{Binding ChildrenModel2}"><TextBlock Text="{Binding Name}"/><HierarchicalDataTemplate.ItemTemplate ><HierarchicalDataTemplate ItemsSource="{Binding ChildrenModel3}"><TextBlock Text="{Binding ID}"/><HierarchicalDataTemplate.ItemTemplate ><DataTemplate><TextBlock Text="{Binding Description}"/></DataTemplate></HierarchicalDataTemplate.ItemTemplate></HierarchicalDataTemplate></HierarchicalDataTemplate.ItemTemplate></HierarchicalDataTemplate></TreeView.ItemTemplate></TreeView>
（4）、运行结果
