关于ASP.NET中TreeView用法的一个小例子

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.SqlClient;
using Common;
using DataAccess;

public partial class Controls_ProductType2 : System.Web.UI.UserControl
{

 ProductType productType = new ProductType();
 Product product = new Product();
 protected void TreeView_TreeNodePopulate(object sender, TreeNodeEventArgs e)
 { if (e.Node.ChildNodes.Count == 0)
 {
 switch (e.Node.Depth)
 {
 case 0:
 PopulateCategories(e.Node);
 break;
 case 1:
 PopulateProductType(e.Node);
 break;
 case 2:
 PopulateProducts(e.Node);
 break;
 }
 }
 // int i = TreeToXml.TreeToXML(TreeView1, "D:/TreeToXML.xml"); }
 protected void Page_Load(object sender, EventArgs e)
 {
 }
 //第一级节点（parentID=0）
 void PopulateCategories(TreeNode node)
 {
 DataTable dt = new DataTable();
 dt = productType.GetListByFatherNode();
 if (dt.Rows.Count > 0)
 {
 foreach (DataRow row in dt.Rows)
 {
 TreeNode NewNode = new TreeNode(row["ProductTypeName"].ToString(), row["ProductTypeID"].ToString(),"","../WebProductList.aspx?productTypeIdOne="+ row["ProductTypeID"].ToString() +"","");
 NewNode.PopulateOnDemand = true;
 NewNode.SelectAction = TreeNodeSelectAction.Expand;
 node.ChildNodes.Add(NewNode);
 node.Expanded = true ;
 }
 }
 }
 //第二级节点
 void PopulateProductType(TreeNode node)
 {
 DataTable dt = new DataTable();
 QueryParam queryparam = new QueryParam();
 queryparam.Add("ParentID", QueryParam.RELATION.EQ, "" + node.Value + "");
 dt = productType.GetListByBranchNode(queryparam);
 if (dt.Rows.Count > 0)
 {
 foreach (DataRow row in dt.Rows)
 {
 TreeNode NewNode = new TreeNode(row["ProductTypeName"].ToString(), row["ProductTypeID"].ToString(), "", "../WebProductList.aspx?productTypeIdTwo=" + row["ProductTypeID"].ToString() + "", "");
 NewNode.PopulateOnDemand = true;
 NewNode.SelectAction = TreeNodeSelectAction.Expand;
 node.ChildNodes.Add(NewNode);
 node.Expanded = false ;
 }
 }
 }
 //第三个节点
 void PopulateProducts(TreeNode node)
 {
 DataTable dt = new DataTable();
 QueryParam queryparam = new QueryParam();
 queryparam.Add("ProductTypeItemID", QueryParam.RELATION.EQ, "" + node.Value + "");
 dt = product.GetList(queryparam);
 if (dt.Rows.Count > 0)
 {
 foreach (DataRow row in dt.Rows)
 {
 TreeNode NewNode = new TreeNode(row["ProductName"].ToString(), row["ProductID"].ToString(), "", "../WebProductDetaile.aspx?productID=" + row["ProductID"].ToString() + "", "");
 //NewNode.PopulateOnDemand = false;
 //NewNode.SelectAction = TreeNodeSelectAction.None;
 NewNode.PopulateOnDemand =true ;
 NewNode.SelectAction = TreeNodeSelectAction.Expand ;
 node.ChildNodes.Add(NewNode);
 node.Expanded = false;
 }
 }
 }

}

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