WPF —— TreeView树形控件

1 TreeView简介

 TreeView 表示一个控件，该控件在树结构（其中的项可以展开和折叠）中显示分层数据。 

    TreeView 是一个 ItemsControl，这意味着它可以包含任何类型的对象的集合 (，例如字符串、图像或面板) 。

2 Tree View常用的属性

        meun 水平菜单
        contextMenu 内容菜单
        TreeView 树形菜单,

        SelectedItemChanged 当选择子项发生改变的时候触发

        TreeViewItem 子项

3关于Tree View的实例 使用动态绑定数据

 <StackPanel>
     <TreeView Name="t1" SelectedItemChanged="t1_SelectedItemChanged">
         <!--静态数据绑定 TreeViewItem 子项-->
         <TreeViewItem Header="实验小学">
             <TreeViewItem Header="一年级"></TreeViewItem>
             <TreeViewItem Header="二年级"></TreeViewItem>
             <TreeViewItem Header="三年级"></TreeViewItem>
             <TreeViewItem Header="四年级"></TreeViewItem>
         </TreeViewItem>

         <TreeViewItem Header="外国语小学">
             <TreeViewItem Header="炼器基础篇"></TreeViewItem>
             <TreeViewItem Header="筑基篇"></TreeViewItem>
             <TreeViewItem Header="结丹凝丹篇"></TreeViewItem>
             <TreeViewItem Header="元婴化婴篇"></TreeViewItem>
         </TreeViewItem>

         <TreeViewItem Header="裕禄小学">

         </TreeViewItem>

         <!--动态绑定数据:
         单个对象绑定例如textblock label textbox等
         绑定list集合 listbox、combobox、各种菜单、datagrid德国可以绑定属性一般都是: itemsoure
         
         -->
         <TreeView ItemsSource="{Binding }" Name="t2">
             <!--子项绑定是其中一个对象的属性-->
             <TreeView.ItemTemplate>
                 <!--树形数据的模板 ItemsSource 子级菜单对象的集合-->
                 <HierarchicalDataTemplate ItemsSource="{Binding SubMenus}">
                     <!--绑定子集标题-->
                     <TextBlock Text="{Binding Name}">
                         
                     </TextBlock>
                 </HierarchicalDataTemplate>
             </TreeView.ItemTemplate>
         </TreeView>

     </TreeView>
 </StackPanel>

模型类的两种方法

一：

MenuInfo m1 = new MenuInfo()
            {
                Name = "实验小学",
                // 存放子集标题对象
                SubMenus = new List<MenuInfo>()
                {
                    new MenuInfo() {
                        Name= "一年级",
                        SubMenus= new List<MenuInfo>()
                        {
                            new MenuInfo() {Name = "语文"},
                            new MenuInfo() {Name = "数学"},
                            new MenuInfo() {Name = "体育"},
                            new MenuInfo() {Name = "英语"},
                        }
                    },
                    new MenuInfo() { Name="二年级"},
                    new MenuInfo() { Name="三年级"},
                    new MenuInfo() { Name="四年级"},
                    new MenuInfo() { Name="五年级"},

                }
            };

            MenuInfo m2 = new MenuInfo()
            {
                Name = "特殊学校",
                SubMenus = new List<MenuInfo>()
                {
                    new MenuInfo(){Name = "一年班"},
                    new MenuInfo(){Name = "二年班"},
                }
            };

            List<MenuInfo> list = new List<MenuInfo>();
            list.Add(m1);
            list.Add(m2);
            this.t2.ItemsSource = list;

public class MenuInfo
{
    public string Name { get; set; }
    public List<MenuInfo> SubMenus { get; set; } // 子集菜单的集合
    public MenuInfo(string n, MenuInfo m1) 
    {
        Name = n;
        if(m1 != null)
        {
            // 如果父级对象的subMenus 为null 则新建，如果不为空 则添加
            if (m1.SubMenus is null) m1.SubMenus = new List<MenuInfo>();
            m1.SubMenus.Add(this);
        }
    }
    public MenuInfo()
    {

    }
}

二：

        // 标题对象
        MenuInfo gaibang = new MenuInfo("丐帮",null);
        // 二级菜单
        MenuInfo qiaofeng = new MenuInfo("乔峰", gaibang);
        MenuInfo zhuangjuxian = new MenuInfo("庄聚贤", gaibang);
        MenuInfo wuzhuanglao = new MenuInfo("五长老",gaibang);

        // 三级菜单
        MenuInfo xifu1 = new MenuInfo("阿紫", qiaofeng);
        MenuInfo xifu2 = new MenuInfo("阿紫她姐", qiaofeng);
        List<MenuInfo> list = new List<MenuInfo>();
        list.Add(gaibang);
        this.t2.ItemsSource = list;

    }

    private void t1_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
    {
        MessageBox.Show((t1.SelectedItem as TreeViewItem).Header.ToString());

    }
}
public class MenuInfo
{
    public string Name { get; set; }
    public List<MenuInfo> SubMenus { get; set; } // 子集菜单的集合
    public MenuInfo(string n, MenuInfo m1) 
    {
        Name = n;
        if(m1 != null)
        {
            // 如果父级对象的subMenus 为null 则新建，如果不为空 则添加
            if (m1.SubMenus is null) m1.SubMenus = new List<MenuInfo>();
            m1.SubMenus.Add(this);
        }
    }
    public MenuInfo()
    {

    }
}