(转)ASP.NET 2.0 树型数据的显示源代码(递归)

using System;

using System.Data;

using System.Data.SqlClient;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page

{

SqlConnection conn = new SqlConnection("workstation id="cyz";user id=sa;password=****;initial catalog=pubs;persist security info=false");

DataSet ds = new DataSet();

protected void Page_Load(object sender, EventArgs e)

{

if (! (IsPostBack) )

{

SqlDataAdapter da = new SqlDataAdapter("select * from t_tree order by parentid", conn);

da.Fill(ds, "t_tree");

InitTree0();

}

}

private void InitTree0() //根结点加载函数

{

TV.Nodes.Clear(); //TV为TreeView控件

DataRow[] rows = ds.Tables["t_tree"].Select("parentid=0");

for (int i = 0; i < rows.Length; i++)

{

TreeNode T_root = new TreeNode();

DataRow dr = rows[i];

T_root.Text = dr["Descricpt"].ToString();

TV.Nodes.Add(T_root);

InitTree(T_root, dr["id"].ToString());//根结点加载完后，开始调用加载子结点的函数，并开始递归。

}

}

private void InitTree(TreeNode Nd,String Parent_id) //子树结点加载函数

{

DataRow[] rows = ds.Tables["t_tree"].Select("parentid="+Parent_id );

if (rows != null)

{

for (int i = 0; i < rows.Length;i++ )

{

TreeNode Tnd = new TreeNode();

DataRow dr=rows[i];

Tnd.Text = dr["Descricpt"].ToString();

Nd.ChildNodes.Add(Tnd);

InitTree(Tnd,dr["id"].ToString());//递归调用

}

}

}

}

/*后注：

一、T_Tree表生成脚本

CREATE TABLE [dbo].[T_Tree] (

[ID] [int] NOT NULL ,

[ParentID] [int] NOT NULL ,

[Descricpt] [varchar] (50) COLLATE Chinese_PRC_CI_AS NULL

) ON [PRIMARY]

GO

二、T_Tree表数据



Parentid=0的为根结点

三、执行后结果