ASP.NET - 无限极分类

下拉列表--------

数据库设计：

-- 无限分类 --

-- 数据库：DB_InfiniteCategory

-- 数据表：Tb_Infinite

---------------------------------------------------------------

-- 创建数据库
CREATE DATABASE DB_InfiniteCategory

-- 创建数据表
USE DB_InfiniteCategory
CREATE TABLE Tb_Infinite
(
    id int not null,                        --逻辑主键
    pid int not null,                        --父级
    categoryName varchar(10) not null        --分类名称
)

--使用语句
select id, pid, categoryName from Tb_Infinite where pid = 0

代码：

 using System;
 using System.Web.UI;
 using System.Data;
 using System.Data.SqlClient;

 using DAL;
 using System.Web.UI.WebControls;

 namespace InfiniteCategory
 {
     public partial class Default : System.Web.UI.Page
     {
         string toadd = "├";

         protected void Page_Load(object sender, EventArgs e)
         {
             if (!Page.IsPostBack)
             {
                 GetArticleCategory("");
             }
         }

         public void GetArticleCategory(string pid)
         {
             SqlConnection conn = new SqlConnection(" server = HUANGFU-PC; database = DB_InfiniteCategory; integrated security = true");
             string sql = "select id,categoryName from Tb_Infinite where pid=@pid";
             SqlCommand cmd = new SqlCommand(sql, conn);
             SqlParameter Pid = new SqlParameter("@pid", SqlDbType.Int);
             Pid.Value = pid;
             cmd.Parameters.Add(Pid);
             conn.Open();
             SqlDataReader sdr = cmd.ExecuteReader();
             while (sdr.Read())
             {
                 this.DropDownList1.Items.Add(new ListItem(toadd + " " + sdr[].ToString(), sdr[].ToString()));
                 toadd += "─┴";
                 this.GetArticleCategory(sdr[].ToString());
                 toadd = toadd.Substring(, toadd.Length - );
             }
             sdr.Close();
             conn.Close();
         }
     }
 }

最终效果：

===============================================================

导航--------

代码：

 using System;
 using System.Web.UI;
 using System.Data;
 using System.Data.SqlClient;
 using System.Text;

 using DAL;
 using System.Web.UI.WebControls;

 namespace InfiniteCategory
 {
     public partial class Default : System.Web.UI.Page
     {
         StringBuilder s = new StringBuilder();

         protected void Page_Load(object sender, EventArgs e)
         {
             if (!Page.IsPostBack)
             {
                 GetArticleCategory("");
             }
         }

         public void GetArticleCategory(string id)
         {
             SqlConnection conn = new SqlConnection(" server = HUANGFU-PC; database = DB_InfiniteCategory; integrated security = true");
             string sql = "select id,pid,categoryName from Tb_Infinite where id=@id";
             SqlCommand cmd = new SqlCommand(sql, conn);
             SqlParameter Pid = new SqlParameter("@id", SqlDbType.Int);
             Pid.Value = id;
             cmd.Parameters.Add(Pid);
             conn.Open();
             SqlDataReader sdr = cmd.ExecuteReader();
             while (sdr.Read())
             {
                 s.Append(sdr[].ToString()+">");
                 this.GetArticleCategory(sdr[].ToString());
             }
             this.Label1.Text = s.ToString();
             sdr.Close();
             conn.Close();
         }
     }
 }

最终效果：