效果：
前端代码：
1 <%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site1.master.cs" Inherits="APManage.Site1" %> 2 3 <!DOCTYPE html> 4 5 <html xmlns="http://www.w3.org/1999/xhtml"> 6 <head runat="server"> 7 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/> 8 <title></title> 9 <asp:ContentPlaceHolder ID="head" runat="server"> 10 </asp:ContentPlaceHolder> 11 </head> 12 <body> 13 <form id="form1" runat="server"> 14 <div> 15 <asp:TreeView ID="TreeView1" runat="server" OnSelectedNodeChanged ="TreeView1_SelectedNodeChanged" ShowLines="True"> 16 </asp:TreeView> 17 <asp:LinkButton ID="LinkButton1" runat="server" OnClick ="LinkButton1_Click">修改节点</asp:LinkButton> 18 <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server"> 19 20 </asp:ContentPlaceHolder> 21 </div> 22 </form> 23 </body> 24 </html>
后端代码：
1 using System; 2 using System.Collections.Generic; 3 using System.Data; 4 using System.Linq; 5 using System.Web; 6 using System.Web.UI; 7 using System.Web.UI.WebControls; 8 using APManage.App_Code; 9 using System.Data.SqlClient; 10 11 12 namespace APManage 13 { 14 public partial class updateNodes : System.Web.UI.Page 15 { 16 protected void Page_Load(object sender, EventArgs e) 17 { 18 this.DropDownList1.DataSource = SQLHelper.ExecuteTable("select * from Tb_APCategory where ParentID = 1000", CommandType.Text); 19 this.DropDownList1.DataValueField = "ID"; 20 this.DropDownList1.DataTextField = "CategoryName"; 21 this.DropDownList1.DataBind(); 22 23 24 List<category> inof = new List<category>(); 25 SqlDataReader sdr = SQLHelper.ExcuteReader("select ID, CategoryName from Tb_APCategory where ParentID = 1000", CommandType.Text); 26 while (sdr.Read()) 27 { 28 SqlDataReader sdr_2 = SQLHelper.ExcuteReader("select ID, CategoryName from Tb_APCategory where ParentID = " + sdr["ID"].ToString() + "", CommandType.Text); 29 while (sdr_2.Read()) 30 { 31 inof.Add(new category(sdr_2["ID"].ToString(), sdr_2["CategoryName"].ToString())); 32 } 33 } 34 35 this.DropDownList2.DataSource = inof; 36 this.DropDownList2.DataValueField = "ID"; 37 this.DropDownList2.DataTextField = "Name"; 38 this.DropDownList2.DataBind(); 39 40 //this.DropDownList2.DataSource = SQLHelper.ExecuteTable("select * from Tb_APCategory", CommandType.Text); 41 //this.DropDownList2.DataValueField = ""; 42 //this.DropDownList2.DataTextField = ""; 43 //this.DropDownList2.DataBind(); 44 } 45 46 public class category 47 { 48 public category(string id, string name) 49 { 50 Id = id; 51 Name = name; 52 } 53 54 private string id; 55 56 public string Id 57 { 58 get { return id; } 59 set { id = value; } 60 } 61 62 private string name; 63 64 public string Name 65 { 66 get { return name; } 67 set { name = value; } 68 } 69 } 70 } 71 }