xmldocment的问题

Question

XmlDocument doc = new XmlDocument();
            doc.LoadXml(
                "<configuration>" + "<appSettings> " +
                        "<add key='title' value ='整合平台－解析工具'/>" +
                        "</appSettings>" + "</configuration>");            XmlNodeList node = doc.SelectNodes("//configuration/appSettings");
            XmlNode elem = node[0];             Note that InnerText does not include the up.
            Console.WriteLine("Display the InnerText of the element...");
            Console.WriteLine(elem.Attributes["key"].InnerText);             InnerXml includes the up of the element.
            Console.WriteLine("Display the InnerXml of the element...");
            Console.WriteLine(elem.InnerXml);             Set InnerText to a string that includes up.  
             The up is escaped.
            elem.InnerText = "Text containing <up/> will have char(<) and char(>) escaped.";
            Console.WriteLine(elem.OuterXml);             Set InnerXml to a string that includes up.  
             The up is not escaped.
            elem.InnerXml = "Text containing <up/>.";
            Console.WriteLine(elem.OuterXml);报错了，为什么？为什么获取不到属性值？

Answer 1

doc.SelectNodes("/configuration/appSettings")

Answer 2

我改为doc.SelectNodes("/configuration/appSettings")后还是不行

Answer 3

XmlDocument xmldocument=new XmlDocument();
    xmldocument.Load("");
    foreach(XmlNode node in xmldocument.SelectSingleNode("appSettings").ChildNodes)
    {  
     if (node.Name == "add")
     {  
      if (node.Attributes.GetNamedItem("key").Value == "")
      {
      
      }  
     }  
    }
  

Answer 4

为什么doc.SelectNodes("/configuration/appSettings")这样写不行？