xml文件如下

 

筛选出不是a的元素，在打印的时候只能打印OuterXml，XmlNode的InnerXml是空的

[Test]        public void RemoveAppSettings()        {            var xPath = "/root/*[not(self::a)]";            var desktopPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);            var fileName = "test.xml";            var filePath = Path.Combine(desktopPath, fileName);            var doc = new XmlDocument();            doc.Load(filePath);            var nodeList = doc.SelectNodes(xPath);            foreach (XmlNode node in nodeList)            {                Console.WriteLine(node.OuterXml);            }        }