Asp.net XML文档进行添加删改操作的实例代码

<?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> 

/// 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")); 
//} 
} 

/// <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")); 
} 

/// <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")); 
}