SelectSingleNode找不到数据

Question

早上以前都正常，弄的时候SelectSingleNode还能找到数据 下午怎么就不行了，反复调试的时候观察到： root正常。 bookroot不正常，只返回第一条。参数bname输入正常。 nodels正常。这里也用到了bname，都能找到数据。 public static void removebookmark(string bname,string mark) { string file = "d:\\book.xml"; XmlDocument xmldoc = new XmlDocument(); xmldoc.Load(file); XmlNode root = xmldoc.SelectSingleNode("books"); XmlNode bookroot = xmldoc.SelectSingleNode("books/book['" + bname + "']"); if (mark == name) { bookroot.RemoveAll(); root.RemoveChild(bookroot); } else { XmlNodeList nodels = xmldoc.SelectNodes("books/book['" + bname + "']/mark"); foreach (XmlNode nd in nodels) { if (nd.InnerText == mark) { bookroot.RemoveChild(nd); } } } xmldoc.Save(file); } <?xml version="1.0" encoding="utf-8"?><books> <book bname="687" url="C:\Documents and Settings\Administrator\桌面\687.txt"> <mark>1</mark> <mark>3</mark> </book> <book bname="1321622" url="C:\Documents and Settings\Administrator\桌面\1321622.txt"> <mark>11</mark> <mark>31</mark> </book></books> 崩溃，前天、昨天、今天早上都正常，下午SelectSingleNode怎么就找不到数据。 哪位高手指点下

Answer 1

string file = "d:\\book.xml";
            XmlDocument xmldoc = new XmlDocument();
            xmldoc.Load(file);
            XmlNode root = xmldoc.DocumentElement.SelectSingleNode("//books");//这句代码一般是为了获取根节点

            OptionXml(rootNode);
          
            //赋完值保存文档
            xd.Save(filename);

/// <summary>
       ///
       /// </summary>
       /// <param name="root">根节点</param>
        protected void OptionXml(XmlNode root)
        {
           
            foreach (XmlNode node in root.ChildNodes)
            {
                if (node.Name.Contains("file"))
                {
                    node.InnerText = "hello world";
                }
                //递归遍历
                OptionXml(node);
              
            }
         
        }
希望能帮到你

Answer 2

SelectSingleNode本來就是為了返回第一個XMLNode