如何使用ASP.NET中TreeView

这篇文章主要讲解了"如何使用ASP.NET中TreeView"，文中的讲解内容简单清晰，易于学习与理解，下面请大家跟着小编的思路慢慢深入，一起来研究和学习"如何使用ASP.NET中TreeView"吧！

复制代码 代码如下:

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;
}
}
}

}

感谢各位的阅读，以上就是"如何使用ASP.NET中TreeView"的内容了，经过本文的学习后，相信大家对如何使用ASP.NET中TreeView这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是，小编将为大家推送更多相关知识点的文章，欢迎关注！