VS.Net TreeView控件的使用

- -                                   

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using Microsoft.Web.UI.WebControls;
using System.Data.OracleClient;
using System.Text;
using System.Xml;

namespace WebApp
{
 /// <summary>
 /// 用户权限管理示例程序
 /// </summary>
 public class Tree : System.Web.UI.Page
 {
  protected System.Web.UI.WebControls.TextBox TextBox1;
  protected System.Web.UI.WebControls.Button Button1;
  protected Microsoft.Web.UI.WebControls.TreeView tvUser;
  protected Microsoft.Web.UI.WebControls.TreeView tvRights;
  protected System.Web.UI.WebControls.Button Button3;
  protected System.Web.UI.WebControls.Button Button4;
  protected System.Web.UI.WebControls.Button Button2;
 
  private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
   if(!Page.IsPostBack)
   {
    this.InitTree();
   }
  }

  #region Web 窗体设计器生成的代码
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }
  
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {   
   this.Button1.Click += new System.EventHandler(this.Button1_Click);
   this.Button2.Click += new System.EventHandler(this.Button2_Click);
   this.Button3.Click += new System.EventHandler(this.Button3_Click);
   this.tvUser.SelectedIndexChange += new Microsoft.Web.UI.WebControls.SelectEventHandler(this.tvUser_SelectedIndexChange);
   this.tvRights.Check += new Microsoft.Web.UI.WebControls.ClickEventHandler(this.tvRights_Check);
   this.Button4.Click += new System.EventHandler(this.Button4_Click);
   this.Load += new System.EventHandler(this.Page_Load);

  }
  #endregion

  private void InitTree()
  {
   //RightsTree
   OracleConnection conn = new OracleConnection("User ID = klmtsy4;PassWord=klmtsy4;Data Source=ORCL;");
            DataSet ds = new DataSet("Rights");
   OracleDataAdapter da = new OracleDataAdapter("select RightsID,RightsName,Parent as ParentID,HasChild from t_Rights",conn);
   conn.Open();
   da.Fill(ds,"Rights");
   conn.Close();

   this.tvRights.Nodes.Clear();
   TreeNode root = new TreeNode();
   root.Text="功能";
   root.CheckBox = true;
   root.Expanded = true;
   this.tvRights.Nodes.AddAt(0,root);
   
   this.CreateTree(ds.Tables["Rights"],root,"ParentID","0","RightsID","RightsName",true);

   /*
   DataRow[] arrayRow = ds.Tables["Rights"].Select("ParentID='0'");
   foreach(DataRow row in arrayRow)
   {
    TreeNode node = new TreeNode();
    node.Text = row["RightsID"].ToString().Trim()+"["+row["RightsName"].ToString().Trim()+"]";
    node.NodeData=row["RightsID"].ToString().Trim();
    node.CheckBox = true;
    node.Expanded = true;
    this.tvRights.Nodes[0].Nodes.Add(node);
    this.CreateTree(ds.Tables["Rights"],node,"ParentID",node.NodeData.ToString(),"RightsID","RightsName",true);
   }
   */

   //User Tree
   string sql = @"select t.* from
       (select u.UserID as RoleID,u.UserName as RoleName,g.GrpID as ParentID from t_User u,t_Group g where u.GrpID = g.GrpID
        union
        select g.GrpID as RoleID,g.GrpName as RoleName,'0' as ParentID from t_Group g
       )t
       order by t.RoleID";
   OracleDataAdapter daUser = new OracleDataAdapter(sql,conn);
   conn.Open();
   daUser.Fill(ds,"User");
   conn.Close();

   this.tvUser.Nodes.Clear();
   TreeNode rootUser = new TreeNode();
   rootUser.Text="人员";
   rootUser.Expanded = true;
   this.tvUser.Nodes.AddAt(0,rootUser);

   this.CreateTree(ds.Tables["User"],rootUser,"ParentID","0","RoleID","RoleName",false);

   /*
   DataRow[] arrayRowUser = ds.Tables["User"].Select("ParentID='0'");
   foreach(DataRow row in arrayRowUser)
   {
    TreeNode node = new TreeNode();
    node.Text = row["RoleID"].ToString().Trim()+"["+row["RoleName"].ToString().Trim()+"]";
    node.NodeData=row["RoleID"].ToString().Trim();
    node.Expanded = true;
    this.tvUser.Nodes[0].Nodes.Add(node);
    this.CreateTree(ds.Tables["User"],node,"ParentID",node.NodeData.ToString(),"RoleID","RoleName",false);
   }
   */

   //选定某个用户
   tvUser.Nodes[0].Expanded = true;
   string index = "0.3";
   tvUser.SelectedNodeIndex = index;
  }

  /// <summary>
  /// 根据Field,Value 查找Table ,得到叶子数据
  /// </summary>
  /// <param name="table">总体数据集</param>
  /// <param name="toot">根节点</param>
  /// <param name="searchField">查找字段名称</param>
  /// <param name="parentValue">父节点SearchField字段之值</param>
  /// <param name="textField">树中节点的文本字段</param>
  /// <param name="valueField">树中节点的值字段</param>
  /// <param name="hasCheckBox">是否带有CheckBox</param>
  private void CreateTree(DataTable table,TreeNode root,string searchField,string parentValue,string valueField,string textField,bool hasCheckBox)
  {
   DataRow[] arrayRow = table.Select(searchField+"='"+parentValue+"'");
   
   foreach(DataRow row in arrayRow)
   {
    TreeNode node = new TreeNode();
    node.Text = row[valueField].ToString().Trim()+"["+row[textField].ToString().Trim()+"]";
    node.NodeData = row[valueField].ToString().Trim();
    node.CheckBox = hasCheckBox;
    node.Expanded = true;
    root.Nodes.Add(node);

    this.CreateTree(table,node,searchField,node.NodeData.ToString(),valueField,textField,hasCheckBox);
   
   }
  }
  private void tvUser_SelectedIndexChange(object sender, Microsoft.Web.UI.WebControls.TreeViewSelectEventArgs e)
  {
   //this.TextBox1.Text = e.NewNode.Length.ToString();
   this.TextBox1.Text = tvUser.SelectedNodeIndex+tvUser.GetNodeFromIndex(tvUser.SelectedNodeIndex).Text;
   
   string RoleID = tvUser.GetNodeFromIndex(tvUser.SelectedNodeIndex).NodeData.ToString();
   this.SelsectRole(RoleID);
  }

  private void SelsectRole(string roleID)
  {
   //Get Rights of Role
   OracleConnection conn = new OracleConnection("User ID = klmtsy4;PassWord=klmtsy4;Data Source=ORCL;");
   DataSet ds = new DataSet("UserRights");
   OracleDataAdapter da = new OracleDataAdapter("select * from t_UserRights",conn);
   conn.Open();
   da.Fill(ds,"UserRights");
   conn.Close();

   //Clear CheckedItem
   this.ClearChecked(tvRights.Nodes[0]);

   //Check the Item Of Rights Tree
   this.CheckNode(ds.Tables["UserRights"],tvRights.Nodes[0],"UserID",roleID,"RightsID");
  }

  /// <summary>
  /// 清除根节点及其子孙的Checked状态
  /// </summary>
  /// <param name="root">根节点</param>
  private void ClearChecked(TreeNode root)
  {
   root.Checked = false;
   foreach(TreeNode node in root.Nodes)
   {
    //node.Checked = false;
    ClearChecked(node);
   }
  }

  /// <summary>
  /// 设置节点的父辈及其祖辈节点的Checked状态
  /// </summary>
  /// <param name="node">节点</param>
  /// <param name="isChecked">是否被Checked</param>
  private void CheckParent(TreeNode node,bool isChecked)
  {
   //必须用Node.Parent is TreeNode 来判断
   if(node.Parent is TreeNode)
   {
    TreeNode parent = new TreeNode();
    parent = (TreeNode)node.Parent;
    parent.Checked = isChecked;
    //如果节点有子节点被Checked,其也被Checked
    foreach(TreeNode nodeChild in parent.Nodes)
    {
     if(nodeChild.Checked){parent.Checked=true;break;}
    }
    CheckParent(parent,isChecked);
   }
  }

  /// <summary>
  /// 设定根节点的子孙节点的Checked状态
  /// </summary>
  /// <param name="node">根节点</param>
  /// <param name="isChecked">是否被Checked</param>
  private void CheckChild(TreeNode node,bool isChecked)
  { 
   foreach(TreeNode nodeChild in node.Nodes)
   {
    nodeChild.Checked = isChecked;
    CheckChild(nodeChild,isChecked);
   }
  }

  /// <summary>
  /// 根据选定的人员/组,检查根节点的子孙节点,并更新Checked状态
  /// </summary>
  /// <param name="table">包含选定人员/组对应的数据集</param>
  /// <param name="root">根节点</param>
  /// <param name="filterField">过滤字段</param>
  /// <param name="filterValue">过滤字段值</param>
  /// <param name="valueField">要根据过滤条件查找的结果字段</param>
  private void CheckNode(DataTable table,TreeNode root,string filterField,string filterValue,string valueField)
  {
   DataRow[] arrayRow = table.Select(filterField+"='"+filterValue+"'");
   foreach(DataRow row in arrayRow)
   {
    foreach(TreeNode node in root.Nodes)
    {
     if(node.NodeData.Equals(row[valueField].ToString().Trim()))
     {
      node.Checked = true;
      this.CheckParent(node,true);
      this.CheckNode(table,node,filterField,filterValue,valueField);
     }
    }
   }
  }

  private void Button1_Click(object sender, System.EventArgs e)
  { 
   TreeNode nodeSelected = new TreeNode();
   TreeNode node = new TreeNode();
   string index = this.tvUser.SelectedNodeIndex;
   if(index.Length.Equals(1))
   { 
    node.Text = this.TextBox1.Text;   
    tvUser.Nodes.Add(node);
   }
   else
   {
    nodeSelected = tvUser.GetNodeFromIndex(index);
    TreeNode parent = (TreeNode)nodeSelected.Parent;
    node.Text = this.TextBox1.Text;   
    parent.Nodes.Add(node);
   }
  }

  private void Button2_Click(object sender, System.EventArgs e)
  {
   TreeNode parent = new TreeNode();
   TreeNode node = new TreeNode();
   string index = this.tvUser.SelectedNodeIndex;
   parent = tvUser.GetNodeFromIndex(index);
   node.Text = this.TextBox1.Text;
   parent.Nodes.Add(node);
  }

  private void Button3_Click(object sender, System.EventArgs e)
  {
   this.TextBox1.Text = tvRights.Nodes[0].Nodes[0].Text;
   this.CheckParent(tvRights.Nodes[0].Nodes[0],true);
  }

  private void tvRights_Check(object sender, Microsoft.Web.UI.WebControls.TreeViewClickEventArgs e)
  {
   string index = e.Node;
   TreeNode nodeSelected = new TreeNode();
   nodeSelected = tvRights.GetNodeFromIndex(index);   
   this.CheckChild(nodeSelected,nodeSelected.Checked);
   this.CheckParent(nodeSelected,nodeSelected.Checked);
  }

  private void Button4_Click(object sender, System.EventArgs e)
  {
   //得到  UserID
   string index = tvUser.SelectedNodeIndex;
   int iLevel = index.Split('.').Length-2;
   if(iLevel<0)return;
   string UserID = tvUser.GetNodeFromIndex(index).NodeData;

   //遍历tvRights,得到权限组合
   StringBuilder sb = new StringBuilder("<root>");
   sb.Append("<RoleID>"+UserID+"</RoleID>");
   sb.Append("<RoleType>"+iLevel.ToString()+"</RoleType>");
   
   this.GetCheckedValue(sb,"RightsID",tvRights.Nodes[0]);

   sb.Append("</root>");

   //调用数据服务层,提交数据
   string xmlData  = sb.ToString();
   XmlDocument xmlDoc = new XmlDocument();
   xmlDoc.LoadXml(xmlData);

   //声明数据库操作类
   OracleConnection conn = new OracleConnection("User ID = klmtsy4;PassWord=klmtsy4;Data Source=ORCL;");
   OracleCommand cmd = new OracleCommand();
   cmd.Connection = conn;
   cmd.Connection.Open();
   OracleTransaction theTrans = conn.BeginTransaction();
   cmd.Transaction = theTrans;

   string sql = "";
   
   try
   {  
    XmlNode xn = xmlDoc.SelectSingleNode(@"//RoleID");
    string RoleID = xn.InnerText;
    xn = xmlDoc.SelectSingleNode(@"//RoleType");
    string RoleType = xn.InnerText;

    //删除用户的权限
    sql = @"delete from t_RoleRights where RoleID='"+RoleID+"'";
    cmd.CommandText = sql;
    cmd.ExecuteNonQuery();
    XmlNodeList xnl = xmlDoc.SelectNodes(@"//RightsID");
    foreach(XmlNode node in xnl)
    {
     sql = @"insert into t_RoleRights values('"+RoleID+"','"+node.InnerText+"','"+RoleType+"')";
     cmd.CommandText = sql;
     cmd.ExecuteNonQuery();
    }

    cmd.Transaction.Commit();
    cmd.Connection.Close();
   }
   catch
   {
    cmd.Transaction.Rollback();
    cmd.Connection.Close();
   }
   

  }

  private void GetCheckedValue(StringBuilder sbItem,string strElement,TreeNode root)
  {
   foreach(TreeNode node in root.Nodes)
   {
    if(node.Checked)
    {
     sbItem.Append("<"+strElement+">"+node.NodeData+"</"+strElement+">");
    }
    GetCheckedValue(sbItem,strElement,node);
   }
  }

 }
}

6.遍历TreeView节点(递归算法)
private void Page_Load(object sender, System.EventArgs e)
{
 GetAllNodeText(TreeView1.Nodes);
}
void GetAllNodeText(TreeNodeCollection tnc)
{
 foreach(TreeNode node in tnc)
 {
  if(node.Nodes.Count!=0)
   GetAllNodeText(node.Nodes);
  Response.Write(node.Text + " ");
 }
}

7.得到node结点的父节点
TreeNode pnode;
if(node.Parent is TreeNode)
 pnode=(TreeNode)node.Parent;
else
 //node is root node

8.修改TreeView样式（示例）
<iewc:TreeView id="TreeView1" runat="server" HoverStyle="color:blue;background:#00ffCC;" DefaultStyle="background:red;color:yellow;" SelectedStyle="color:red;background:#00ff00;">
用代码：
TreeView1.DefaultStyle["font-size"] = "20pt";

9.展开时不提交，改变选择节点时才提交
将autopostback设置成false; 
在body里添加  <body  onload="initTree()"> 
然后在PageLoad里写： 
string  strTreeName  =  "TreeView1"; 
string  strRef  =  Page.GetPostBackEventReference(TreeView1); 
string  strScript  =  "<script  language=\"JavaScript\">  \n"  +  "<!--  \n"  +  "            function  initTree()  {  \n"  +"                        "  +  strTreeName  +  ".onSelectedIndexChange  =  function()  {  \n"  +    "if  (event.oldTreeNodeIndex  !=   
event.newTreeNodeIndex)  \n"  +  "this.queueEvent('onselectedindexchange',  event.oldTreeNodeIndex  +  ','  +  event.newTreeNodeIndex);  \n"  +    "window.setTimeout('"  +  strRef.Replace("'","\\'")    +  "',  0,  'JavaScript');  \n"  +    "                        }  \n"  +      "            }  \n"  +    "//  -->  \n"  +  "</script>"; 
Page.RegisterClientScriptBlock("InitTree",strScript  ); 
 
这样就只有你点击的节点更改的时候才提交！

10.TreeView结合XML
把XML文件设置为如下格式，然后直接设置TreeNodeSrc为该XML文件就行
<?xml version="1.0" encoding="GB2312"?>
<TREENODES>
 <TREENODE TEXT="node0" EXPANDED="true">
  <TREENODE TEXT="node1"/>
  <TREENODE TEXT="node2"/>
 </TREENODE>
 <TREENODE TEXT="node3" NavigateURL="3.aspx"/>
</TREENODES>
或者用代码
TreeView1.TreeNodeSrc="a.xml";
TreeView1.DataBind();

 

客户端控制TreeView
http://expert.csdn.net/Expert/topic/1382/1382892.xml

1.设置所选节点，如选中第二个节点
function SetSelNode()
{
 TreeView1.selectedNodeIndex="1";
}

2.得到所选节点的Text，ID或NodeData
function GetAttribute()
{
 alert(TreeView1.getTreeNode(TreeView1.selectedNodeIndex).getAttribute("Text"));
}
替换Text为ID或NodeData，可分别得到所选节点的ID或NodeData

3.修改节点属性，如修改第一个节点的Text
function ModifyNode()
{
 var node=TreeView1.getTreeNode("0");
 node.setAttribute("Text","hgknight");
}

4.得到点击节点
function TreeView1.onclick()
{
 alert(TreeView1.getTreeNode(TreeView1.clickedNodeIndex).getAttribute("Text"));
}

5.添加节点
function AddNode()
{
 var node=TreeView1.createTreeNode();
 node.setAttribute("Text","hgknight");
 TreeView1.add(node);    
}

6.js遍历所有节点
 var AllRootNode=new Array();
 AllRootNode=TreeView1.getChildren();
 AlertNode(AllRootNode);   

 function AlertNode(NodeArray)
 {
  if(parseInt(NodeArray.length)==0)
   return;
  else
  {
   for(i=0;i<NodeArray.length;i++)
   {
    var cNode;
    cNode=NodeArray[i];
    alert(cNode.getAttribute("Text"));
    if(parseInt(cNode.getChildren().length)!=0)
     AlertNode(cNode.getChildren());    
   }
  }
 }