下拉列表无级数据绑定

 

private string toadd = "├".

private void GetArticleCategory(string pid)



     {



         SqlConnection conn = new SqlConnection("server=.;database=test;uid=sa;pwd=;");



         string sql = "select Articlesgroup_id,Groupname from Articlesgroup where Articlesgroup_parent_id=@pid order by Groupname";



         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[1].ToString(), sdr[0].ToString()));



             toadd += "─┴";



             this.GetArticleCategory(sdr[0].ToString());



           toadd = toadd.Substring(0, toadd.Length - 2);  



         }



         sdr.Close();



         conn.Close();



     }

在Page_Load里调用

 

程序代码 程序代码

   protected void Page_Load(object sender, EventArgs e)



     {



         this.keyword.Attributes.Add("onfocus","if( this.value=='key key key') {this.value='' };");



         if (!Page.IsPostBack)



         {



             this.GetArticleCategory("0");



         }



         this.DropDownList1.Items.Insert(0, new ListItem("Search All", "all"));



     }