TreeView

            //可手动添加根节点和子节点，也可代码添加

            //两个根节点

            TreeNode tn1 = treeView1.Nodes.Add("省份");

            TreeNode tn2 = treeView1.Nodes.Add("市区");

            //三个子节点，用于显示省份

            TreeNode tn01 = new TreeNode("河南省");

            TreeNode tn02 = new TreeNode("江苏省");

            TreeNode tn03 = new TreeNode("浙江省");

            //三个子节点，用于显示市区

            TreeNode tn04 = new TreeNode("郑州市");

            TreeNode tn05 = new TreeNode("南京市");

            TreeNode tn06 = new TreeNode("杭州市");

            tn1.Nodes.Add(tn01);

            tn1.Nodes.Add(tn02);

            tn1.Nodes.Add(tn03);

            tn2.Nodes.Add(tn04);

            tn2.Nodes.Add(tn05);

            tn2.Nodes.Add(tn06);

 private void Form1_Load(object sender, EventArgs e)

        {

            //可手动添加根节点和子节点，也可代码添加

            //两个根节点

            TreeNode tn1 = treeView1.Nodes.Add("省份");

            TreeNode tn2 = treeView1.Nodes.Add("市区");

            //三个子节点，用于显示省份

            TreeNode tn01 = new TreeNode("河南省");

            TreeNode tn02 = new TreeNode("江苏省");

            TreeNode tn03 = new TreeNode("浙江省");

            //三个子节点，用于显示市区

            TreeNode tn04 = new TreeNode("郑州市");

            TreeNode tn05 = new TreeNode("南京市");

            TreeNode tn06 = new TreeNode("杭州市");

            tn1.Nodes.Add(tn01);

            tn1.Nodes.Add(tn02);

            tn1.Nodes.Add(tn03);

            tn2.Nodes.Add(tn04);

            tn2.Nodes.Add(tn05);

            tn2.Nodes.Add(tn06);

            //给节点添加图标

            imageList1.Images.Add(Image.FromFile(@"F:\图片\Pictures\立体图片\Fish06.jpg"));

            imageList1.Images.Add(Image.FromFile(@"F:\360wallpaper_dt.jpg"));

            treeView1.ImageList = imageList1;

            treeView1.ImageIndex = 0;

            tn01.ImageIndex = 1;

            //选中后换图标

            treeView1.SelectedImageIndex = 1;

        }



        private void button1_Click(object sender, EventArgs e)

        {



            treeView1.Nodes.Remove(treeView1.SelectedNode);

        }



        private void treeView1_AfterSelect(object sender, TreeViewEventArgs e)

        {

            label2.Text = e.Node.Text;

        }

将数据库中的数据递归加载到TreeView上

class Area

    {

        public int AreaID

        {

            get; set;

        }

        public string AreaName

        {

            get; set;

        }

        public int AreadPID

        {

            get; set;

        }

    }

    class SqlHelper

    {

        private static readonly  string conStr = System.Configuration.ConfigurationManager.ConnectionStrings["conStr"].ConnectionString;

        /// <summary>

        /// 执行SQL语句返回一个DataReader

        /// 当返回DataReader的时候 注意

        /// 1、Connection不能关闭

        /// 2、DataReader不能关闭

        /// 3、Command对象执行ExecuteReader()方法的时候传递一个参数ConmandBehavior.CloseConnection

        /// </summary>

        /// <param name="sqlCmd"></param>

        /// <param name="pms"></param>

        /// <returns></returns>

        public static SqlDataReader ExecuteReader(string sqlCmd, params SqlParameter[] pms)

        {

            SqlConnection con=new SqlConnection(conStr);

            using (SqlCommand cmd=new SqlCommand(sqlCmd,con))

            {

                if (pms != null)

                {

                    cmd.Parameters.AddRange(pms);

                }con.Open();

                SqlDataReader reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);

                return reader;

            }

        }

        public static int ExecuteNonQuery(string sql,params SqlParameter[]pms)

        {

            using(SqlConnection con=new SqlConnection(conStr))

            {

                using(SqlCommand cmd=new SqlCommand(sql,con))

                {

                    if(pms!=null)

                    {

                        cmd.Parameters.AddRange(pms);

                    }

                    con.Open();

                    return cmd.ExecuteNonQuery();

                }

            }

        }

    }

public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            List<Area> list = GetDataByParentID(0);

            LoadDataToTree(treeView1.Nodes,list);

        }



        private void LoadDataToTree(TreeNodeCollection treeNodeCollection, List<Area> list)

        {

            foreach (Area area in list)

            {

                TreeNode node = treeNodeCollection.Add(area.AreaName);

                //记录当前区域的ID

                node.Tag = area.AreaID;

                //设置让TreeView中每个节点单击右键时显示右键菜单

                node.ContextMenuStrip = deletecontextMenuStrip1;

                //获取当前ID对应的所有子节点

                List<Area> listChild = GetDataByParentID(area.AreaID);

                LoadDataToTree(node.Nodes,listChild);

            }

        }

        /// <summary>

        /// 根据PID获取该区域下面的所有子ID

        /// </summary>

        /// <param name="pid"></param>

        /// <returns></returns>

        private List<Area> GetDataByParentID(int pid)

        {

            List<Area> list=new List<Area>();

            string selectCmd = "select * from City where AreaPID=@pid";

            using (SqlDataReader reader = SqlHelper.ExecuteReader(selectCmd, new SqlParameter("@pid", pid)))

            {

                if (reader.HasRows)

                {

                    while (reader.Read())

                    {

                        Area model=new Area();

                        model.AreaID = reader.GetInt32(0);

                        model.AreaName = reader.GetString(1);

                        model.AreadPID = reader.GetInt32(2);

                        list.Add(model);

                    }

                }

            }

            return list;

        }

        private void button2_Click(object sender, EventArgs e)

        {

            if (treeView1.SelectedNode != null)

            {

                int areaID = (int) treeView1.SelectedNode.Tag;

                DeleteByAreaID(areaID);

                treeView1.SelectedNode.Remove();

            }

        }

        private void DeleteByAreaID(int areaID)

        {

            List<Area> list=GetDataByParentID(areaID);

            foreach(Area item in list)

            {

                DeleteByAreaID(item.AreaID);

            }

            string sqlCommand="delete from City where AreaID=@id";

            SqlParameter pms=new SqlParameter("@id",areaID);

            SqlHelper.ExecuteNonQuery(sqlCommand,pms);

        }



        private void Form1_Load(object sender, EventArgs e)

        {



        }



        private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)

        {

            //获得选中节点

            this.treeView1.SelectedNode = e.Node;

        }



        private void button2_Click_1(object sender, EventArgs e)

        {

            

        }



        private void 删除ToolStripMenuItem_Click(object sender, EventArgs e)

        {

            if (treeView1.SelectedNode != null)

            {

                int areaID = (int)treeView1.SelectedNode.Tag;

                DeleteByAreaID(areaID);

                treeView1.SelectedNode.Remove();

            }

        }



       

    }

将XML中的文件节点绑定到TreeView中

<?xml version="1.0"  ?>

<食物>

    <水果>

    <苹果>20元</苹果>

    </水果>

    <水果>

    <橘子>15元</橘子>

    </水果>

</食物>

using System.IO;//引用与输入输出文件流有关的命名空间

using System.Xml;//引用与XML有关的命名空间



namespace BindingXML

{

    public partial class Frm_Main : Form

    {

        public Frm_Main()

        {

            InitializeComponent();

        }                                                                                          



        private XmlDocument NexusDocument = new XmlDataDocument();//定义一个XML文档对象

        private void BindingXML_Load(object sender, EventArgs e)

        {

            string filePath = "NexusPoint.xml";//定义一个变量保存XML文件的路径

            if(File.Exists(filePath))//当在指定路径下存在该文件时

            {

                NexusDocument.Load(filePath);//加载该路径下的XML文件

                RecursionTreeControl(NexusDocument.DocumentElement,treeView1.Nodes);//将加载完成的XML文件显示在TreeView控件中

                treeView1.ExpandAll();//展开TreeView控件中的所有项

            }

        }

         /// <summary>

         /// RecursionTreeControl:表示将XML文件的内容显示在TreeView控件中

         /// </summary>

         /// <param name="xmlNode">将要加载的XML文件中的节点元素</param>

         /// <param name="nodes">将要加载的XML文件中的节点集合</param>

        private void RecursionTreeControl(XmlNode xmlNode,TreeNodeCollection nodes)

        {

            foreach(XmlNode node in xmlNode.ChildNodes)//循环遍历当前元素的子元素集合

            {

                string temp = (node.Value != null ? node.Value : (node.Attributes != null && node.Attributes.Count > 0) ? node.Attributes[0].Value : node.Name);//表示TreeNode节点的文本内容

                TreeNode new_child = new TreeNode(temp);//定义一个TreeNode节点对象

                nodes.Add(new_child);//向当前TreeNodeCollection集合中添加当前节点

                RecursionTreeControl(node,new_child.Nodes);//调用本方法进行递归

            }

        }

    }

}

 

http://msdn.microsoft.com/query/dev10.query?appId=Dev10IDEF1&l=ZH-CN&k=k(TREEVIEW);k(TargetFrameworkMoniker-%22.NETFRAMEWORK%2cVERSION%3dV4.0%22);k(DevLang-CSHARP)&rd=true