using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Data.SqlClient;
namespace WindowsFormsApplication12
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public bool IsPostBack { get; private set; }
private void Form1_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
DataSet ds = new DataSet();
SqlDataAdapter da = new SqlDataAdapter("select * from dbo.Table3", "server=USER-M9T1I10TS8;database=db_2017;uid=sa;pwd=123;");
da.Fill(ds);
//DataTable dt =ds.Tables[0]; //从数据库里取出数据
this.treeView1.Nodes.Clear();
nodes(this.treeView1.Nodes, ds, 0);
this.treeView1.CollapseAll();
}
}
public string fid = "-1";
private void nodes(TreeNodeCollection tnode, DataSet ds, int id)
{
//创建视图 ，应为只有一张表
DataView dview = new DataView(ds.Tables[0]);
//视图的好处，在于能方便筛选数据
dview.RowFilter = "[fid]=" + id + "";
//显示每个节点的标题,递归！
foreach (DataRowView row in dview)
{
TreeNode node = new TreeNode();
node.Text = row["name"].ToString();
tnode.Add(node);
nodes(node.Nodes, ds, int.Parse(row["id"].ToString()));
}
}
private void nodes(object childNodes, DataSet ds, int v)
{
throw new NotImplementedException();
}
}
}