表结构：
表数据：
最终效果：
前端代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Test.aspx.cs" Inherits="APManage.Test" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TreeView ID="TreeView1" runat="server">
</asp:TreeView>
</div>
</form>
</body>
</html>
后端代码：
using System;
using System.Data;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
namespace APManage
{
public partial class Test : System.Web.UI.Page
{
private readonly string ConnString = @"server = HUANGFU-PC; database = DB_APManage; integrated security = true";
private DataTable dt = null;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
dt = new DataTable();
GetMenuToDataTable("select * from Tb_APCategory", dt);
BindTree(dt, null, "1000");
}
}
private void BindTree(DataTable dtSource, TreeNode parentNode, string parentID)
{
DataRow[] rows = dtSource.Select(string.Format("ParentID={0}", parentID));
foreach (DataRow row in rows)
{
TreeNode node = new TreeNode();
node.Text = row["CategoryName"].ToString();
node.Value = row["ParentID"].ToString();
BindTree(dtSource, node, row["ID"].ToString());
if (parentNode == null)
{
this.TreeView1.Nodes.Add(node);
}
else
{
parentNode.ChildNodes.Add(node);
}
}
}
private DataTable GetMenuToDataTable(string query, DataTable dt)
{
using (SqlConnection conn = new SqlConnection(ConnString))
{
SqlCommand cmd = new SqlCommand(query, conn);
SqlDataAdapter ada = new SqlDataAdapter(cmd);
ada.Fill(dt);
}
return dt;
}
}
}