DropDownList多级树

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DropDownList多级树

DropDownList多级树
Cate.xml文件内容

<?xml version="1.0" encoding="utf-8" ?>
<Root>
  <Content>
    <ID>1</ID>
    <ParentID>0</ParentID>
    <CateName>类别1</CateName>
  </Content>
  <Content>
    <ID>2</ID>
    <ParentID>1</ParentID>
    <CateName>类别2</CateName>
  </Content>
  <Content>
    <ID>3</ID>
    <ParentID>2</ParentID>
    <CateName>类别3</CateName>
  </Content>
  <Content>
    <ID>4</ID>
    <ParentID>3</ParentID>
    <CateName>类别4</CateName>
  </Content>
  <Content>
    <ID>5</ID>
    <ParentID>0</ParentID>
    <CateName>类别5</CateName>
  </Content>
  <Content>
    <ID>6</ID>
    <ParentID>0</ParentID>
    <CateName>类别6</CateName>
  </Content>
  <Content>
    <ID>7</ID>
    <ParentID>6</ParentID>
    <CateName>类别7</CateName>
  </Content>
  <Content>
    <ID>8</ID>
    <ParentID>7</ParentID>
    <CateName>类别8</CateName>
  </Content>
  <Content>
    <ID>9</ID>
    <ParentID>0</ParentID>
    <CateName>类别9</CateName>
  </Content>
  <Content>
    <ID>10</ID>
    <ParentID>0</ParentID>
    <CateName>类别10</CateName>
  </Content>
</Root>

面页Default.aspx内容

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:DropDownList ID="ddlCate" runat="server">
        </asp:DropDownList></div>
    </form>
</body>
</html>

Default.aspx.cs内容

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            BindData(0, "",0);
        }
    }
    private void BindData(int pId,string textStr,int m)
    {
       DataTable dt= CateDAL.GetData(pId,Server.MapPath("Cate.xml"));
       if (dt != null)
       {
           for (int i = 0; i < dt.Rows.Count; i++)
           {

               textStr = "";
               if (pId != 0)
               {
                   m = m + 1;
                   for (int j = 0; j < m; j++)
                   {
                       textStr += "　";
                   }
               }
               else
               {
                   m = 0;
               }

               int parantID = Convert.ToInt32(dt.Rows[i]["ID"].ToString());
               ddlCate.Items.Add(new ListItem(textStr + "├" + dt.Rows[i]["CateName"].ToString(), parantID.ToString()));
               BindData(parantID, textStr, m);
           }

       }
    }
}

App_Code/CateDAL.cs文件

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/**//// <summary>
/// Class1 的摘要说明
/// </summary>
public class CateDAL
{
    private CateDAL()
    {
        //
        // TODO: 在此处添加构造函数逻辑
        //
    }

    public static DataTable GetData(int parantID,string Path)
    {
        XmlUtility xmlData = new XmlUtility(Path);
        DataSet ds = xmlData.GetData("Root/Content[ParentID=\"" + parantID + "\"]");
        if (ds.Tables.Count != 0)
        {
            return ds.Tables[0];
        }
        else
        {
            return null;
        }
    }
}

XmlUtility.cs文件就是介绍我的博客上有

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原文地址：https://www.cnblogs.com/skyblue/p/1204101.html