无限极列表2

Code：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;



namespace WebAppFL

{

    public partial class WebForm1 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            if (!IsPostBack)

                BindDropDownList(this.AreaSource);

        }

        /// <summary>

        /// 绑定分类下拉列表

        /// </summary>

        private void BindDropDownList(List<TreeType> myList)

        {

            this.TParentCate.Items.Add(new ListItem("◇根目录", "0"));

            BindDropListByList(myList);



        }





        /// <summary>

        /// List<T>里过滤根基点

        /// </summary>

        /// <param name="m">结构树</param>

        /// <returns>T/F</returns>

        private bool FindMatch(TreeType m)

        {

            if (m.ParentID == 0)

            {

                return true;

            }

            return false;

        }



        /// <summary>

        /// 按层次绑定下拉框

        /// </summary>

        /// <param name="mList">结构树</param>

        private void BindDropListByList(List<TreeType> mList)

        {

            string chrFlag = "┆┄◇";

            List<TreeType> list = mList.FindAll(FindMatch);

            foreach (TreeType m in list)

            {

                this.TParentCate.Items.Add(new ListItem(chrFlag + m.Name, m.ID.ToString()));

                RecursionBind(mList, m.ID, ref chrFlag);

            }

        }

        /// <summary>

        /// 绑定类

        /// </summary>

        /// <param name="mList">结构树</param>

        /// <param name="mCateID">树编号</param>

        /// <param name="chr">分割符</param>

        private void RecursionBind(List<TreeType> mList, int mCateID, ref string chr)

        {

            foreach (TreeType m in mList)

            {

                if (m.ParentID == mCateID)

                {

                    chr = "┆┄" + chr;

                    this.TParentCate.Items.Add(new ListItem(chr + m.Name, m.ID.ToString()));

                    RecursionBind(mList, m.ID, ref chr);

                }



            }

            if (chr != "┆┄◇")

            chr = chr.Remove(0,2);



        }



        /// <summary>

        /// 测试数据源

        /// </summary>

        private List<TreeType> AreaSource

        {

            get

            {

                List<TreeType> TreeList = new List<TreeType>();

                TreeList.Add(new TreeType(1, 0, "湖北"));

                TreeList.Add(new TreeType(2, 0, "江苏"));

                TreeList.Add(new TreeType(3, 0, "浙江"));

                TreeList.Add(new TreeType(4, 1, "黄冈"));

                TreeList.Add(new TreeType(5, 4, "黄冈镇级"));

                TreeList.Add(new TreeType(6, 5, "黄冈村"));

                TreeList.Add(new TreeType(7, 3, "杭州"));

                TreeList.Add(new TreeType(8, 2, "南京"));

                TreeList.Add(new TreeType(9, 0, "北京"));

                TreeList.Add(new TreeType(10, 9, "海淀"));

                TreeList.Add(new TreeType(11, 10, "中关村"));

                TreeList.Add(new TreeType(12, 10, "上地"));

                return TreeList;

            }

        }





    }

}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;



namespace WebAppFL

{

    public class TreeType

    {

        private int  _ID;

        public int ID

        {

            get { return _ID; }

            set { _ID = value; }

        }

        private string _Name;

        public string Name

        {

            get { return _Name; }

            set { _Name = value; }

        }

        private int _ParentID;

        public int ParentID

        {

            get { return _ParentID; }

            set { _ParentID = value; }

        }

        public TreeType(int id, int parentid, string name)

        {

            // TODO: Complete member initialization

            this._ID = id;

            this._Name = name;

            this._ParentID = parentid;

           

        }

    }

}

HTML：

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebAppFL.WebForm1" %>



<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">



<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

    <title></title>

</head>

<body>

    <form id="form1" runat="server">

    <div>

     <asp:DropDownList ID="TParentCate" runat="server"></asp:DropDownList>

    </div>

    </form>

</body>

</html>

demo：