TreeView控件使用总结

刚开始接触TreeView控件的时候，感觉很苦恼，因为要像下面的方式来填充它：

using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class ascx_ReleaseMenuManage : System.Web.UI.UserControl
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Dispaly();
            GetParentNodes();
           
        }
    }
    private void Dispaly()
    {
        IList<Node> parents = GetData("0");
        foreach (Node parent in parents)
        {
            TreeNode parentnode = this.CreateTreeNode(parent.Name, parent.ID, parent.Url);
            CreateChildNode(parent.ID, parentnode);
            TreeView1.Nodes.Add(parentnode);
        }
       
    }
    private TreeNode CreateTreeNode(string funname, string id, string url)
    {
        TreeNode newNode = new TreeNode();
        newNode.Text = funname;
        newNode.Value = id;
        //newNode.NavigateUrl = ResolveUrl(url.Trim());
        return newNode;
    }

    private void CreateChildNode(string nodeid, TreeNode parentnode)
    {
        IList<Node> children = GetData(nodeid);
        foreach (Node child in children)
        {
            TreeNode childnode = this.CreateTreeNode(child.Name, child.ID, child.Url);
            CreateChildNode(child.ID, childnode);
            AddTree(parentnode, childnode);
        }

    }
    private void AddTree(TreeNode fathernode, TreeNode chilenode)
    {
        fathernode.ChildNodes.Add(chilenode);
    }
    private IList<Node> GetData(string id)
    {
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ToString());
        SqlCommand cmd = new SqlCommand("select funid,funname,funurl from releasefuninfo where fatherid=@id", con);
        cmd.Parameters.AddWithValue("id", id);
        con.Open();
        SqlDataReader reader = cmd.ExecuteReader();
        List<Node> nodes = new List<Node>();
        while (reader.Read())
        {
            Node n = new Node();
            n.ID = reader["funid"].ToString();
            n.Name = reader["funname"].ToString();
            n.Url = reader["funurl"].ToString();
            nodes.Add(n);
        }
        return nodes;
    }


    protected void TreeView1_SelectedNodeChanged1(object sender, EventArgs e)
    {
      
        string current = ((TreeView)sender).SelectedNode.Value;
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ToString());
        SqlCommand cmd = new SqlCommand("select funname,funurl,displayid from releasefuninfo where funid=@id", con);
        cmd.Parameters.AddWithValue("id", current);
        con.Open();
        SqlDataReader reader = cmd.ExecuteReader();
        while (reader.Read())
        {
            txtMenu_Name.Text = reader["funname"].ToString();
            txtMenu_http.Text = reader["funurl"].ToString();
            if (reader["displayid"].ToString() == "1")
            {
                chkMenu_Lock.Checked = true;
            }
            else
            {
                chkMenu_Lock.Checked = false;

            }
        }
    }
    private void GetParentNodes()
    {
      
        SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["constr"].ToString());
        SqlCommand cmd = new SqlCommand("select funid, funname from releasefuninfo where fatherid=0", con);
     
        con.Open();
        SqlDataReader reader = cmd.ExecuteReader();
       
        while (reader.Read())
        {
            ListItem  item=new ListItem();
            item.Text = reader["funname"].ToString();
            item.Value = reader["funid"].ToString();
            txtMenu_FaterID.Items.Add(item);
        }
        con.Close();
    }
    public class Node
    {
        public string ID { get; set; }
        public string Name { get; set; }
        public string Url { get; set; }
    }
}

嘿嘿 ，最近终于找到一个简洁的方式来填充它了，很是开心，代码如下：

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class TreeViewTest : System.Web.UI.Page
{
    DataSet ds ;
    protected void Page_Load(object sender, EventArgs e)
    {

        if (!IsPostBack)
        {
            ds = new DataSet();
           SqlConnection con = new SqlConnection(SqlHelp.Constr);
        SqlDataAdapter sda = new SqlDataAdapter("select * from releasefuninfo", con);
        sda.Fill(ds); 
            GridView1.DataSource = ds.Tables[0].DefaultView;
        GridView1.DataBind();
       AddNode(TreeView1.Nodes, "0");
        }
        
      
    }
    private void AddNode(TreeNodeCollection nodes, string id)
    {
        DataView dv = new DataView();
        dv.Table = ds.Tables[0];
        dv.RowFilter = "fatherid=" + "'" + id + "'";
        TreeNode tn;
        foreach (DataRowView v in dv)
        {
            tn = new TreeNode();
            tn.Value = v["funid"].ToString();
            tn.Text = v["funname"].ToString();
            tn.NavigateUrl = ResolveUrl( v["funurl"].ToString());
            nodes.Add(tn);
            AddNode(tn.ChildNodes, tn.Value);
        }
    }
}

类似的用法可以用子Menu控件上；