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