ASP.NET操作XML读取和保存

<?xml version="1.0" encoding="utf-8"?>

<root>

  <env>

    <param name="rate" value="3" />

    <param name="url" value="3" />

  </env>

  <vr startpano="start" width="10" height="540" x="0" y="0" >

    <pano name="url" url="Car/Model/InteriorPanorama/BJXD_i30/S-max.jpg">

    </pano>

  </vr>

  <background file="control/bg.jpg">

  </background>

</root>

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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;
using System.Xml;

public partial class SomePages_OperateXML : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string str = ReadXML();
        lblReadXML.Text = str;
        SaveXML();
    }
    private string  ReadXML()
    {
        string strReturn = string.Empty;

        XmlDocument doc = new XmlDocument();
        doc.Load(Server.MapPath("~/images/config.xml"));
        XmlElement root = doc.DocumentElement;
       
        //定义要求匹配项 name="url"
        string path = @"//*[@name='url']";
        //在当前节点根据匹配项进行寻找
        foreach (XmlNode node in root.SelectNodes(path))
        {
            strReturn += "匹配项：" + path;
            strReturn += "节点：" + node.Name;
            strReturn += "<br/>";
        }

        //直接寻找指定节点读取值
        XmlElement x = (XmlElement)root.SelectSingleNode("vr");
        if (x != null)
        {
            strReturn += x.GetAttribute("startpano");
        }
        return strReturn;

    }
    private void SaveXML()
    {
        XmlDocument doc = new XmlDocument();
        doc.Load(Server.MapPath("~/images/config.xml"));

        XmlElement root = doc.DocumentElement;
        XmlElement x = (XmlElement)root.SelectSingleNode("vr");

        if (x != null)
        {
            //设置节点属性
            x.SetAttribute("width1", "10");
            //创建节点
            XmlElement x1 = doc.CreateElement("test");
            x1.SetAttribute("width", "100");
            //添加节点
            x.AppendChild(x1);
            //保存xml
            doc.Save(Server.MapPath("~/images/config.xml"));
        }
    }
}