Asp.net 对一下XML文档进行添加删改的实例

XML文件名为bcastr.xml

结构如下：

<?xml version="1.0" encoding="utf-8"?>
<bcaster>
  <item id="79" item_url="PicNews/Img/u=404630538,2075277077" link="HTML/050/AI_20081017_50_53_79.html" itemtitle="111111111111111111" />
  <item id="78" item_url="PicNews/Img/Index_04_01_06.jpg" link="HTML/050/AI_20081017_50_53_78.html" itemtitle="zengjia" />
  <item id="77" item_url="PicNews/Img/bsxwf.jpg" link="HTML/050/AI_20081017_50_53_77.html" itemtitle="中国药科大学研究生部" />
  <item id="76" item_url="PicNews/Img/江宁大门.jpg" link="HTML/050/AI_20081017_50_53_76.html" itemtitle="研究生部图片新闻" />
  <item id="75" item_url="PicNews/Img/中国药科大学校标（完美2）.jpg" link="HTML/050/AI_20081017_50_53_75.html" itemtitle="新闻测试图片新闻" />
</bcaster>
添加节点的函数：

/// 将图片新闻信息写入到图片新闻播放器的XML文件集中
    /// </summary>
    /// <param name="picpath">图片路径</param>
    /// <param name="htmlpath">图片新闻网址</param>
    /// <param name="title">标题</param>
    public void WritePicNewsXML(string picpath, string htmlpath, string title,string aid)
    {
        XmlDocument xmlDoc;
        xmlDoc = new XmlDocument();
        xmlDoc.Load(HttpContext.Current.Server.MapPath("../PicNews/bcastr.xml"));

        XmlNodeList xnl = xmlDoc.SelectSingleNode("bcaster").ChildNodes;
        //if (xnl.Count <= 5)//保持首页图片新闻不超过5条
        //{
            XmlNode rootnode = xmlDoc.SelectSingleNode("bcaster");

            XmlElement fel = (XmlElement)rootnode.FirstChild;
            
            XmlElement el = xmlDoc.CreateElement("item");//添加子节点及属性
            el.SetAttribute("id", aid);
            el.SetAttribute("item_url", picpath);
            el.SetAttribute("link", htmlpath);
            el.SetAttribute("itemtitle", title);
            rootnode.PrependChild(el);//将新加入的图片新闻添加到第一个位置
            if (xnl.Count > 5)
            {
                XmlNode lxn = rootnode.LastChild;
                rootnode.RemoveChild(lxn);//删除最末尾的图片新闻
            }
            

            xmlDoc.Save(HttpContext.Current.Server.MapPath("../PicNews/bcastr.xml"));
        //}
    }
修改XML节点的属性的函数：

/// <summary>
    /// 修改XML属性
    /// </summary>
    /// <param name="picpath"></param>
    /// <param name="htmlpath"></param>
    /// <param name="title"></param>
    /// <param name="aid"></param>
    public void EditPicNewsXML(string picpath, string htmlpath, string title, string aid)
    {

        XmlDocument xmlDoc;
        xmlDoc = new XmlDocument();
        xmlDoc.Load(HttpContext.Current.Server.MapPath("../PicNews/bcastr.xml"));

        XmlNodeList xnl = xmlDoc.SelectSingleNode("bcaster").ChildNodes;
        foreach (XmlNode xn in xnl)
        {
            XmlElement xe = (XmlElement)xn;
            if (xe.GetAttribute("id") == aid)//如果节点存在则改写
            {
                xe.SetAttribute("item_url", picpath);
                xe.SetAttribute("link", htmlpath);
                xe.SetAttribute("itemtitle", title);
                break;
            }
        }

        xmlDoc.Save(HttpContext.Current.Server.MapPath("../PicNews/bcastr.xml"));
    }
删除指定的XML节点的函数：

 /// <summary>
    /// 删除XML指定节点
    /// </summary>
    /// <param name="aid"></param>
    public void DelPicNewsXML(string aid)
    {
        XmlDocument xmlDoc;
        xmlDoc = new XmlDocument();
        xmlDoc.Load(HttpContext.Current.Server.MapPath("../PicNews/bcastr.xml"));

        XmlNodeList xnl = xmlDoc.SelectSingleNode("bcaster").ChildNodes;
        foreach (XmlNode xn in xnl)
        {
            XmlElement xe = (XmlElement)xn;
            if (xe.GetAttribute("id") == aid)//如果节点存在删除
            {
                xe.RemoveAll();
                break;
            }
        }

        xmlDoc.Save(HttpContext.Current.Server.MapPath("../PicNews/bcastr.xml"));
    }