无限增长的Tree-----查找
数据表设计：
IF OBJECT_ID ('dbo.WapClass') IS NOT NULL
DROP TABLE dbo.WapClass
GO
CREATE TABLE dbo.WapClass
(
ClassId INT IDENTITY NOT NULL, --编号
ClassParentId INT NOT NULL, --父节点编号
ClassName NVARCHAR (50) NOT NULL, --节点名称
Url NVARCHAR (300) NULL, --点击后连接的路径
CONSTRAINT PK_WapClass PRIMARY KEY (ClassId)
)
GO
实体类：WapBar.Model.WapClass.cs
using System;
namespace WapBar.Model
{
/// <summary>
/// 实体类WapClass
/// </summary>
[Serializable]
public class WapClass
{
public WapClass()
{}
#region Model
private int _classid;
private string _classname;
private int _classparentid;
private string _url;
/// <summary>
///
/// </summary>
public int ClassId
{
set { _classid = value; }
get { return _classid; }
}
/// <summary>
///
/// </summary>
public string ClassName
{
set { _classname = value; }
get { return _classname; }
}
/// <summary>
///
/// </summary>
public int ClassParentId
{
set { _classparentid = value; }
get { return _classparentid; }
}
/// <summary>
///
/// </summary>
public string Url
{
set { _url = value; }
get { return _url; }
}
#endregion Model
}
}
aspx页面：
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WapClass.aspx.cs" Inherits="WapBarAdmin.WapClass" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TreeView ID="TreeView1" runat="server" ImageSet="Arrows">
</asp:TreeView>
</div>
</form>
</body>
</html>
CodeBehind：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Data.Common;
namespace WapBarAdmin
{
public partial class WapClass : System.Web.UI.Page
{
//数据库操纵类工厂
private DbProviderFactory dbFactory = DbProviderFactories.GetFactory("System.Data.SqlClient");
protected void Page_Load(object sender, EventArgs e)
{
if (!this.Page.IsPostBack)
{
WapBar.Model.WapClass wapClass = null;
TreeNode treeNode = null;
DataTable dt = this.GetTreeParentNodes();
foreach (DataRow row in dt.Rows)
{
wapClass= new WapBar.Model.WapClass();
wapClass.ClassId = int.Parse(row["ClassId"].ToString());
wapClass.ClassName = row["ClassName"].ToString();
wapClass.ClassParentId = int.Parse(row["ClassParentID"].ToString());
wapClass.Url = row["Url"].ToString();
treeNode = new TreeNode();
treeNode.Text = wapClass.ClassName;
treeNode.ToolTip = wapClass.ClassName;
treeNode.Value = wapClass.ClassId.ToString();
treeNode.NavigateUrl = wapClass.Url;
this.BindTreeNodes(wapClass.ClassId, treeNode);
this.TreeView1.Nodes.Add(treeNode);
}
}
}
#region 绑定子节点
/// <summary>
/// 绑定子节点
/// </summary>
/// <param name="classID">父节点ID</param>
public void BindTreeNodes(int classID, TreeNode treeNode)
{
WapBar.Model.WapClass wapClass = null;
TreeNode tempTreeNode = null;
DataTable dt = this.GetTreeNodesByClassID(classID);
if (dt != null && dt.Rows.Count != 0)
{
foreach (DataRow row in dt.Rows)
{
wapClass = new WapBar.Model.WapClass();
wapClass.ClassId = int.Parse(row["ClassId"].ToString());
wapClass.ClassName = row["ClassName"].ToString();
wapClass.ClassParentId = int.Parse(row["ClassParentID"].ToString());
wapClass.Url = row["Url"].ToString();
tempTreeNode = new TreeNode();
tempTreeNode.Text = wapClass.ClassName;
tempTreeNode.ToolTip = wapClass.ClassName;
tempTreeNode.Value = wapClass.ClassId.ToString();
tempTreeNode.NavigateUrl = wapClass.Url;
treeNode.ChildNodes.Add(tempTreeNode);
//递归调用
this.BindTreeNodes(wapClass.ClassId, tempTreeNode);
}
}
}
#endregion 绑定子节点
#region 得到连接对象
/// <summary>
/// 得到连接对象
/// </summary>
/// <returns></returns>
public DbConnection GetDBConn()
{
DbConnection dbconn = null;
try
{
dbconn = dbFactory.CreateConnection();
dbconn.ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"].ToString();
}
catch (Exception ee)
{
throw new Exception(ee.Message.ToString());
}
return dbconn;
}
#endregion 得到连接对象
#region 打开连接
/// <summary>
/// 打开连接
/// </summary>
/// <param name="dbconn">要打开的连接对象</param>
public void OpenDBConn(DbConnection dbconn)
{
try
{
if (dbconn != null && dbconn.State.ToString().Equals("Closed"))
{
dbconn.Open();
}
}
catch (Exception ee)
{
throw new Exception(ee.Message.ToString());
}
}
#endregion 打开连接
#region 关闭连接
/// <summary>
/// 关闭连接
/// </summary>
/// <param name="dbconn">关闭的连接对象</param>
public void CloseDBConn(DbConnection dbconn)
{
try
{
if (dbconn != null && dbconn.State.ToString().Equals("Open"))
{
dbconn.Close();
}
}
catch (Exception ee)
{
throw new Exception(ee.Message.ToString());
}
}
#endregion 关闭连接
#region 查找根节点
/// <summary>
/// 查找根节点
/// </summary>
/// <returns></returns>
public DataTable GetTreeParentNodes()
{
DbConnection dbconn = null;
DbDataAdapter da = null;
DbCommand cmd = null;
DataTable dt = null;
try
{
dt = new DataTable();
dbconn = this.GetDBConn();
this.OpenDBConn(dbconn);
da = dbFactory.CreateDataAdapter();
cmd = dbFactory.CreateCommand();
cmd.CommandText = "select * from [WapClass] Where [ClassParentID] = 0";
cmd.Connection = dbconn;
da.SelectCommand = cmd;
da.Fill(dt);
}
catch (Exception ee)
{
throw new Exception(ee.Message.ToString());
}
finally
{
this.CloseDBConn(dbconn);
}
return dt;
}
#endregion 查找根节点
#region 根据父节点的ClassID查找子节点
/// <summary>
/// 根据父节点的ClassID查找子节点
/// </summary>
/// <param name="classID">父节点ID</param>
/// <returns></returns>
public DataTable GetTreeNodesByClassID(int classID)
{
DbConnection dbconn = null;
DbDataAdapter da = null;
DbCommand cmd = null;
DbParameter dbparam = null;
DataTable dt = null;
try
{
dt = new DataTable();
dbconn = this.GetDBConn();
this.OpenDBConn(dbconn);
da = dbFactory.CreateDataAdapter();
cmd = dbFactory.CreateCommand();
cmd.CommandText = "select * from [WapClass] Where [ClassParentID]=@ClassID";
cmd.Connection = dbconn;
dbparam = dbFactory.CreateParameter();
dbparam.DbType = DbType.Int32;
dbparam.ParameterName = "@ClassID";
dbparam.Value = classID;
cmd.Parameters.Add(dbparam);
da.SelectCommand = cmd;
da.Fill(dt);
}
catch (Exception ee)
{
throw new Exception(ee.Message.ToString());
}
finally
{
this.CloseDBConn(dbconn);
}
return dt;
}
#endregion 根据父节点的ClassID查找子节点
}
}