asp.net中Treeview数据绑定与动态增加节点示例

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Left.aspx.cs" Inherits="Left" %>

using System;
using System.Data;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class Left : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            BindTree();
            //InitTree();
        }
    }
    #region 主从表绑定
    private void BindTree()
    {
        DataSet dst = GetTreeViewData();
        TreeView1.ShowCheckBoxes = TreeNodeTypes.All;
        foreach (DataRow masterRow in dst.Tables["province"].Rows)
        {
            TreeNode masterNode = new TreeNode((string)masterRow["province"]);
            TreeView1.Nodes.Add(masterNode);
            foreach (DataRow childRow in masterRow.GetChildRows("Children"))
            {
                TreeNode childNode =new TreeNode((string)childRow["city"]);
                masterNode.Expanded = false;
                masterNode.ChildNodes.Add(childNode);
            }
        }
    }
    private DataSet GetTreeViewData()
    {
        string constring = System.Configuration.ConfigurationSettings.AppSettings["ConnectionStr"];
        SqlConnection con = new SqlConnection(constring);
        SqlDataAdapter daprovince = new SqlDataAdapter("SELECT * FROM province", con);
        SqlDataAdapter dacity = new SqlDataAdapter("SELECT * FROM city", con);
        DataSet ds = new DataSet();
        daprovince.Fill(ds, "province");
        dacity.Fill(ds, "city");
        ds.Relations.Add("Children", ds.Tables["province"].Columns["provinceid"], ds.Tables["city"].Columns["father"]);
        return ds;
    }
    #endregion
    #region 递归绑定同一个表数据
    private void InitTree()
    {
        DataTable dt = GetTreeViewTable();
        DataView dv = new DataView(dt);
        dv.RowFilter = "ParentID=0";
        TreeView1.ShowCheckBoxes = TreeNodeTypes.All;
        foreach (DataRowView drv in dv)
        {
            TreeNode node = new TreeNode();
            node.Text = drv["text"].ToString();
            node.Value = drv["ID"].ToString();
            node.Expanded = false;
            TreeView1.Nodes.Add(node);
            AddReplies(dt,node);
        }
    }
    private DataTable GetTreeViewTable()
    {
        string constring = System.Configuration.ConfigurationSettings.AppSettings["ConnectionStr"];
        SqlConnection con = new SqlConnection(constring);
        SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM treeview", con);
        DataTable dt = new DataTable();
        da.Fill(dt);
        return dt;
    }
    private void AddReplies(DataTable dt, TreeNode node)
    {
        DataView dv = new DataView(dt);
        dv.RowFilter = "ParentID='" + node.Value + "'";
        foreach (DataRowView row in dv)
        {
            TreeNode replyNode = new TreeNode();
            replyNode.Text = row["text"].ToString();
            replyNode.Value = row["ID"].ToString();
            replyNode.Expanded = false;
            node.ChildNodes.Add(replyNode);
            AddReplies(dt,replyNode);
        }
    }
    #endregion
}