C#通过XPath解析xml文件

        static void Main(string[] args)
        {
            String XMLString = "<?xml version=\"1.0\" encoding=\"utf - 8\"?>" +
                "<MID bom=\"91 - 40F15Q7 - CHFD0AA\">" +
                "<Prop>" +
                "<Parameter><item>item1</item><value>item1-value</value></Parameter>" +
                "<Parameter><item>item2</item><value>item2-value</value></Parameter>" +
                "<Parameter><item>item3</item><value>item3-value</value></Parameter>" +
                "<Parameter><item>item3</item><value>item3-newvalue</value></Parameter>" +
                "</Prop>" +
                "</MID> ";

            XmlDocument doc = new XmlDocument();
            doc.LoadXml(XMLString);

            XmlElement root = doc.DocumentElement;

            XmlNodeList ParameterNodes = root.SelectNodes("/MID/Prop/Parameter");

            //RemoveAllTest(ParameterNodes);

            RemoveChildTestNormal(ParameterNodes);
        }

        /// <summary>
        /// RemoveAll清除所有属性，那一行还在
        /// 结果：共四行，第三行空白
        /// </summary>
        /// <param name="list"></param>
        private static void RemoveAllTest(XmlNodeList list)
        {
            list[2].RemoveAll();
            Console.WriteLine(list.Count);
            for (int i = 0; i < list.Count; i++)
            {
                Console.WriteLine(list[i].InnerXml);
            }
            Console.ReadLine();
        }

        /// <summary>
        /// RemoveChild可以返回“被移除”的那一行。实际上那一行并没有被移除
        /// 有没有“XmlNode tmp = list[list.Count - 1]”这句有很大差别。
        /// 有的话会按照list原来的大小打印，共四行。如果没有，那就打印三行
        /// ReplaceChild根本没效果。以后如果需要去重的话，只有转化为arraylist
        /// </summary>
        /// <param name="list"></param>
        private static void RemoveChildTestNormal(XmlNodeList list)
        {
            XmlNode tmp = list[list.Count - 1];
            XmlNode moved = null;
            for(int i = 0; i < list.Count; i++)
            {
                moved = list[i].ParentNode.RemoveChild(list[i]);
            }
            //list[2].ParentNode.ReplaceChild(tmp, moved);

            // Console.WriteLine("tmp =\n" + tmp.InnerXml);
            // Console.WriteLine("moved =\n" + moved.InnerXml);
            Console.WriteLine(list.Count);
            for (int i = 0; i < list.Count; i++)
            {
                Console.WriteLine(list[i].InnerXml);
            }
            Console.ReadLine();
        }