1、递归

        下面是Winform的递归添加菜单栏数据，数据设置好父子id方便递归使用

在TreeView的控件窗口加载时，调用递归加载菜单

private void LoadTvMenu()
        {
            this.nodeList = objService.GetAllMenu();    // 通过Service得到全部数据

            // 创建一个根节点
            this.tv_MenuList.Nodes.Clear(); // 亲空所有节点
            // 这个是TreeView的节点
            TreeNode rootNode = new TreeNode();
            rootNode.Text = "学员管理系统";
            rootNode.Tag = "0"; // 暂时没什么用
            rootNode.ImageIndex = 0;    // 设置根节点现实的图片
            this.tv_MenuList.Nodes.Add(rootNode);   // 将根节点添加到treeview根节点

            // 基于递归方式添加所有子节点
            CreateChildNode(rootNode, "0");
        }


        private void CreateChildNode(TreeNode parentNode, string preId)
        {
            var nodes = from list in nodeList
                        where list.ParentId.Equals(preId)
                        select list;

            foreach (var item in nodes)
            {
                TreeNode node = new TreeNode();
                node.Text = item.MenuName;
                node.Tag = item.MenuCode;

                // 设置节点图表
                if (item.ParentId == "0")
                {
                    node.ImageIndex = 1;
                }
                else
                {
                    node.ImageIndex = 3;
                }

                parentNode.Nodes.Add(node); // 给父节点添加上这个子节点

                // 递归调用
                CreateChildNode(node, item.MenuId.ToString());
                this.tv_MenuList.Nodes[0].Expand(); // 将一级目录全部展开
                this.tv_MenuList.ExpandAll();
            }
        }

在WPF中也是差不多的可以用递归实现加载TreeView

2、WPF中可以使用HierarchicalDataTemplate非常方便

 创建数据类

public class ListLeagueList : ObservableCollection<League>
{
    List<League> leagues = new List<League>();
    List<Division> divisions = new List<Division>();
    List<Team> teams = new List<Team>();

    public ListLeagueList()
    {
        teams.Add(new Team() { Name = "Team 1" });
        teams.Add(new Team() { Name = "Team 2" });
        teams.Add(new Team() { Name = "Team 3" });
        teams.Add(new Team() { Name = "Team 4" });

        divisions.Add(new Division() { Name = "Division 1", Teams = teams });
        divisions.Add(new Division() { Name = "Division 2", Teams = teams });
        divisions.Add(new Division() { Name = "Division 3", Teams = teams });

        Add(new League() { Name = "League a", Divisions = divisions });
        Add(new League() { Name = "League b", Divisions = divisions });
        Add(new League() { Name = "League c", Divisions = divisions });
    }
}

 view中        设置下一个子集合为ItemsSource

<DockPanel>
    <DockPanel.Resources>
        <local:ListLeagueList x:Key="myList" />
        <HierarchicalDataTemplate DataType="{x:Type models:League}" ItemsSource="{Binding Divisions}">
            <TextBlock Text="{Binding Path=Name}" />
        </HierarchicalDataTemplate>
        <HierarchicalDataTemplate DataType="{x:Type models:Division}" ItemsSource="{Binding Teams}">
            <TextBlock Text="{Binding Path=Name}" />
        </HierarchicalDataTemplate>
        <!--  最后一个没有ItemsSource  -->
        <HierarchicalDataTemplate DataType="{x:Type models:Team}">
            <TextBlock Text="{Binding Path=Name}" />
        </HierarchicalDataTemplate>
    </DockPanel.Resources>


    <Menu
        x:Name="menu1"
        Margin="10"
        DockPanel.Dock="Top">
        <MenuItem Header="我的足球联赛" ItemsSource="{Binding Source={StaticResource myList}}" />
    </Menu>

    <TreeView x:Name="treeView1">
        <TreeViewItem Header="我的足球联赛" ItemsSource="{Binding Source={StaticResource myList}}" />
    </TreeView>

</DockPanel>

使用HierarchDataTemplate后可以显示多层的控件都可以使用

-- 这里的ItemsSource是集合，使用其它方式绑定上也是一样的；HierarchicalDataTemplate就是独立于这个集合的，检测到合适就起作用