高兴,学习中量变到质变,ASP.NET 2.0 树型数据的显示源代码(原创,用递归)

高兴,学习中量变到质变,ASP.NET 2.0 树型数据的显示源代码(原创,用递归)


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





*/