Asp.net XML文档进行添加删改操作的实例代码

XML文件名为bcastr.xml

结构如下：
复制代码 代码如下:
<?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：
复制代码 代码如下:
/// 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：
复制代码 代码如下:
/// <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：
复制代码 代码如下:
/// <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"));
}