C#读取XML

/*本地xml  转化为stream读取*/
string path=HttpContext.Current.Server.MapPath(@".\AdminConfig.xml");
Stream stream = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);

XmlTextReader reader = new XmlTextReader(stream);
XmlDocument xd = new XmlDocument();
xd.Load(reader);

/*URL格式XML，转化为stream读取*/
string url = SPContext.Current.Site.Url + @"/gasScripts/AdminConfig.xml";
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(url);
HttpWebResponse myHttpWebResponse = (HttpWebResponse)myHttpWebRequest.GetResponse();
Stream stream = myHttpWebResponse.GetResponseStream();

XmlTextReader reader = new XmlTextReader(stream);
XmlDocument xd = new XmlDocument();
xd.Load(reader);

/*URL格式XML，直接读取URL*/

string url =@"http://***/gasScripts/webconfig.xml";
XmlTextReader reader = new XmlTextReader(url);
XmlDocument xd = new XmlDocument();
xd.Load(reader);
XmlNode node = xd.SelectSingleNode("/appSettings/add[@key='dingwen']");
Console.Write(node.Attributes["value"].Value);