XPath

doc.DocumentElement

http://msdn.microsoft.com/zh-cn/vstudio/hcebdtae.aspx

http://msdn.microsoft.com/zh-cn/vstudio/d271ytdx.aspx

http://blog.csdn.net/greatverve/archive/2008/12/10/3490741.aspx

helper

http://helper2008.codeplex.com/releases/view/18554

http://www.cnblogs.com/qianlifeng/archive/2010/04/26/1721459.html

 

TestCode:

 

public class XmlHelper
    {
        protected String xmlNameSpace=string.Empty;
        protected XmlDocument XmlDoc = new XmlDocument();
        protected XmlNamespaceManager nmgr ;
        public string xmlns=string.Empty;   //namespace alias

 

        public XmlHelper(string xmlPath)
        {
            try
            {
                XmlDoc.Load(xmlPath);
                xmlNameSpace = XmlDoc.FirstChild.NamespaceURI;
                if (!string.IsNullOrEmpty(xmlNameSpace))
                {
                    xmlns = "TemptNS";//set namespace alias
                    nmgr = new XmlNamespaceManager(XmlDoc.NameTable);
                    nmgr.AddNamespace(xmlns, xmlNameSpace);
                    xmlns += ":";
                }
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
        }

        ~XmlHelper()
        {
            XmlDoc = null;  
        }

        public void Save(string filePath)
        {
            try
            {
                XmlDoc.Save(GetXmlFilePath(filePath));
            }
            catch (System.Exception ex)
            {
                throw ex;
            }
        }

       
        public string GetXmlFilePath(string xmlFile)
        {
            return HttpContext.Current.Server.MapPath(xmlFile);
        }

     

        public XmlNodeList SelectNodeList(string XmlPathNode)
        {
            return XmlDoc.SelectNodes(XmlPathNode, nmgr);
        }

        public XmlNode SelectSingeNode(string XmlPathNode)
        {
            return XmlDoc.SelectSingleNode(XmlPathNode, nmgr);
        }
}


//一个带namespace 一个不带namespace
string classpath="aa.xml";
            string po = "bbb.xml";
            XmlHelper op = new XmlHelper(po);
            XmlHelper oclass = new XmlHelper(classpath);
            XmlNodeList tempt1 = oclass.SelectNodeList("//" + oclass.xmlns + "Root/" + oclass.xmlns + "Student");
            XmlNodeList tempt = op.SelectNodeList("//" + op.xmlns + "ICSMXML/" + op.xmlns + "Header");