1.效果图
2 后台数据库数据填充方式
a.数据库数据
b.前台页面
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="TreeViewTest.aspx.cs" Inherits="Yc_TestS.TreeViewTest" %>
<!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>TreeView</title>
<script type="text/javascript">
function show(msg) {
alert(msg);
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TreeView ID="treeT" runat="server">
</asp:TreeView>
</div>
</form>
</body>
</html>
TreeViewTest.aspx
c.后台代码
using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Security;
using System.Data;
using Yc_TestS.BaseClass;
namespace Yc_TestS
{
public partial class TreeViewTest : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
AddTree(0, null);
}
private void AddTree(int Pid, TreeNode PNode)
{
string sqlStr = "SELECT Item_id,Item_name,Parent_ID FROM Para_item";
DataTable dt = YSqlHelper.ExecuteQuery(sqlStr, CommandType.Text);
if (dt.Rows.Count > 0)
{
DataView dv = new DataView(dt);
//过滤ParentID,得到当前的所有子节点 ParentID为父节点ID
dv.RowFilter = "[Parent_ID] = " + Pid;
//循环递归
foreach (DataRowView Row in dv)
{
//声明节点
TreeNode Node = new TreeNode();
//绑定超级链接
Node.NavigateUrl = String.Format("javascript:show('{0}')", Row["Item_Name"].ToString());
//开始递归
if (PNode == null)
{
//添加根节点
Node.Text = Row["Item_Name"].ToString();
treeT.Nodes.Add(Node);
Node.Expanded = true; //节点状态展开
AddTree(Int32.Parse(Row["Item_ID"].ToString()), Node); //再次递归
}
else
{
//添加当前节点的子节点
Node.Text = Row["Item_Name"].ToString();
PNode.ChildNodes.Add(Node);
Node.Expanded = true; //节点状态展开
AddTree(Int32.Parse(Row["Item_ID"].ToString()), Node); //再次递归
}
}
}
}
}
}
TreeViewTest.aspx.cs
d.配置文件
<?xml version="1.0"?>
<!--
有关如何配置 ASP.NET 应用程序的详细消息，请访问
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<appSettings>
<add key="sqlStr" value="0dd8de75eb51766d66d42ead8ea26b0c533f6fdb009e9fd2e6e1c9867d2766ec499405047e4173a74015f57800e3afb982fd39d96dcc1590c8c943242992c84b "/>
</appSettings>
<system.web>
<compilation debug="true"/>
</system.web>
</configuration>
Web.config
e.两个助手类
using System;
using System.Collections.Generic;
using System.Web;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace Yc_TestS.BaseClass
{
public class EntryCode
{
/// <summary>加密</summary>
public static string EncodeCode(string str)
{
string key = "david.yc";
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(str);
MemoryStream stream = new MemoryStream();
CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);
stream2.Write(bytes, 0, bytes.Length);
stream2.FlushFinalBlock();
StringBuilder builder = new StringBuilder();
foreach (byte num in stream.ToArray())
{
builder.AppendFormat("{0:X2}", num);
}
stream.Close();
return builder.ToString().Trim();
}
/// <summary> Des 解密 GB2312 </summary>
public static string DecodeCode(string str)
{
string key = "david.yc";
DESCryptoServiceProvider provider = new DESCryptoServiceProvider();
provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));
provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));
byte[] buffer = new byte[str.Length / 2];
for (int i = 0; i < (str.Length / 2); i++)
{
int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);
buffer[i] = (byte)num2;
}
MemoryStream stream = new MemoryStream();
CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);
stream2.Write(buffer, 0, buffer.Length);
stream2.FlushFinalBlock();
stream.Close();
return Encoding.GetEncoding("GB2312").GetString(stream.ToArray()).Trim();
}
}
}
加密和解密（EntryCode.cs）
using System;
using System.Collections.Generic;
using System.Web;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
namespace Yc_TestS.BaseClass
{
public class YSqlHelper
{
private static string connectionString = EntryCode.DecodeCode(ConfigurationManager.AppSettings["sqlStr"]);//获取解密后的数据库连接字符串
/// <summary>执行不带参数的增删改SQL语句或存储过程</summary>
/// <param name="cmdText">增删改SQL语句或存储过程</param>
/// <param name="ct">命令类型</param>
/// <returns>受影响的行数</returns>
public static int ExecuteNonQuery(string cmdText, CommandType ct)
{
int res = 0;
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
cmd.CommandType = ct;
res = cmd.ExecuteNonQuery();
}
}
catch
{
}
finally
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
}
}
return res;
}
/// <summary>执行带参数的增删改SQL语句或存储过程</summary>
/// <param name="cmdText">增删改SQL语句或存储过程</param>
/// <param name="ct">命令类型</param>
/// <returns>受影响的行数</returns>
public static int ExecuteNonQuery(string cmdText, SqlParameter[] paras, CommandType ct)
{
int res = 0;
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
cmd.CommandType = ct;
cmd.Parameters.AddRange(paras);
res = cmd.ExecuteNonQuery();
}
}
catch
{
}
finally
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
}
}
return res;
}
/// <summary> 执行带参数的查询SQL语句或存储过程</summary>
/// <param name="cmdText">查询SQL语句或存储过程ì</param>
/// <param name="paras">参数集合?</param>
/// <param name="ct">命令类型</param>
/// <returns>DataTable对象</returns>
public static DataTable ExecuteQuery(string cmdText, CommandType ct)
{
DataTable dt = new DataTable();
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
cmd.CommandType = ct;
using (SqlDataReader sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
dt.Load(sdr);
}
}
}
catch
{
}
finally
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
}
}
return dt;
}
/// <summary> 执行带参数的查询SQL语句或存储过程</summary>
/// <param name="cmdText">查询SQL语句或存储过程ì</param>
/// <param name="paras">参数集合?</param>
/// <param name="ct">命令类型</param>
/// <returns>DataTable对象</returns>
public static DataTable ExecuteQuery(string cmdText, SqlParameter[] paras, CommandType ct)
{
DataTable dt = new DataTable();
using (SqlConnection conn = new SqlConnection(connectionString))
{
try
{
conn.Open();
using (SqlCommand cmd = new SqlCommand(cmdText, conn))
{
cmd.CommandType = ct;
cmd.Parameters.AddRange(paras);
using (SqlDataReader sdr = cmd.ExecuteReader(CommandBehavior.CloseConnection))
{
dt.Load(sdr);
}
}
}
catch
{
}
finally
{
if (conn.State == ConnectionState.Open)
{
conn.Close();
}
}
}
return dt;
}
}
}
SQL数据库助手类（YSqlHelper.cs）
3.一些方法记录
a.控制父结点的开/合状态
TreeView_Tree.GetNodeFromIndex("1").Expanded=false/true;
b.清除某个父结点下的所有子节点
TreeView_IndexLeft.GetNodeFromIndex("1").Nodes.Clear();
c.设置所选节点，如选中第二个节点
function SetSelNode() { TreeView_Tree.selectedNodeIndex="1"; }
d.得到所选节点的Text，ID或NodeData
function GetAttribute() { alert(TreeView_Tree.getTreeNode(TreeView_Tree.selectedNodeIndex).getAttribute("Text")); }
//替换Text为ID或NodeData，可分别得到所选节点的ID或NodeData
e.修改节点属性，如修改第一个节点的Text
function ModifyNode() { var node=TreeView_Tree.getTreeNode("0"); node.setAttribute("Text","第一个节点"); }
f.添加节点
function AddNode() { var node=TreeView_Tree.createTreeNode(); node.setAttribute("Text","第一个节点"); TreeView_Tree.add(node); }
g.TreeView 中的SelectedIndexChange不执行
AutoPostBack=true，SelectedIndexChange才能被执行。
h.判断 TreeView 的一个节点下是否有子节点
if(SelectNode.Nodes.Count==0) { //该节点没有字节点 }