是XPathNavigator吧?
see:ms-help://MS.VSCC.2003/MS.MSDNQTR.2003FEB.2052/cpguide/html/cpconxpathnavigatorinnetframework.htm
see:ms-help://MS.VSCC.2003/MS.MSDNQTR.2003FEB.2052/cpguide/html/cpconxpathnavigatorinnetframework.htm
调试欢乐多
String filename = "bookDTD.xml";
txtReader = new XmlTextReader(filename);
reader = new XmlValidatingReader(txtReader);
reader.ValidationType = ValidationType.DTD;
reader.ValidationEventHandler += eventHandler;
XmlDocument doc = new XmlDocument();
doc.Load(reader);
Console.WriteLine(doc.OuterXml);