Default.aspx<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ""><html xmlns="" ><head runat="server"><title>无标题页</title></head><body><form id="form1" runat="server"><div><asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder><br /><asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" /></div></form></body></html>Default.aspx.csusing System;using System.Data;using System.Configuration;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using Model;using BLL;public partial class _Default : System.Web.UI.Page{private CategoryBLL _categoryBLL = new CategoryBLL();private Category _category = new Category();private void Page_Init(object sender, System.EventArgs e){BindDrpClass();}protected void Page_Load(object sender, EventArgs e){string str = "8/14/19/25"; //数据库读取string[] arr = str.Split(‘http://blog.csdn.net/’);if (arr.Length == PlaceHolder1.Controls.Count) //防止新增类别时读取出错{for (int i = 0; i < PlaceHolder1.Controls.Count; i++){if (PlaceHolder1.Controls[i] is DropDownList){((DropDownList)PlaceHolder1.Controls[i]).SelectedValue = arr[i];}}}}private void BindDrpClass(){DataTable dt = _categoryBLL.GetCategory();DataRow[] drs = dt.Select("pid=0");foreach (DataRow dr in drs){string id = dr["id"].ToString();string name = dr["name"].ToString();DropDownList ddl = new DropDownList();ddl.Items.Clear();ddl.ID = "ddl" + id;ddl.Items.Add(new ListItem("－" + name + "－", id));PlaceHolder1.Controls.Add(ddl);int sonparentid = int.Parse(id);BindDrpNode(sonparentid, dt, ddl);}}private void BindDrpNode(int parentid, DataTable dt, DropDownList ddl){DataRow[] drs = dt.Select("pid= " + parentid);foreach (DataRow dr in drs){string id = dr["id"].ToString();string name = dr["name"].ToString();ddl.Items.Add(new ListItem(name, id));PlaceHolder1.Controls.Add(ddl);}}protected void Button1_Click(object sender, EventArgs e){string category = "";string category2 = "";foreach (Control childControl in PlaceHolder1.Controls){if (childControl is DropDownList){category += "/" + ((DropDownList)childControl).SelectedItem.Text;category2 += "/" + ((DropDownList)childControl).SelectedValue;}}if (category.Length > 0)category = category.Remove(0, 1);Response.Write(category);Response.Write("<br />");if (category2.Length > 0)category2 = category2.Remove(0, 1);Response.Write(category2);}}
，没有口水与汗水，就没有成功的泪水。
