#region "获取xml文件内容"

            //将xml文件加载进来

            XDocument xdoc = XDocument.Load("F:\\6.2    \\DelegateExample\\XmlConsole\\XMLFile.xml");

            //获取xml根元素操作

            XElement root = xdoc.Root;

            XElement elem = root.Element("book");

            //获取name标签的值

            XElement name = elem.Element("name1");

            Console.WriteLine(name.Value);

            Console.WriteLine("------------------------");

            //获取根元素下的所有子元素

            IEnumerable<XElement> element = root.Elements();

            foreach (XElement item in element)

            {

                foreach (XElement item1 in item.Elements())

                {

                    Console.WriteLine(item1.Value);

                }

                Console.WriteLine("------------------------");

                Console.WriteLine(item.Attribute("id").Value);

                Console.ReadKey();

            }

            #endregion                

　　　　　　 //获取根节点元素

            XDocument xdocument = new XDocument();

            XElement roo = new XElement("b");

            XElement root2 = new XElement("book",new XElement("name3","",new XAttribute("id","")));

            XElement name1 = new XElement("name1");

            XElement root3 = new XElement("student");

            root2.SetElementValue("name1","");

            root2.SetElementValue("name2", ""); 

            root3.SetAttributeValue("student1","");

            root3.SetElementValue("student2","");

            roo.Add(name1);

            roo.Add(root2);

            roo.Add(root3);

            roo.Save("D://XMLfile.xml");

            Console.ReadKey();

 　　　　 //取根结点

          var root = xmlDoc.DocumentElement;//取到根结点

         //取指定的单个结点

          XmlNode oldChild =     xmlDoc.SelectSingleNode("BookStore/NewBook");

         //取指定的结点的集合

          XmlNodeList nodes = xmlDoc.SelectNodes("BookStore/NewBook");

         //取到所有的xml结点

          XmlNodeList nodelist = xmlDoc.GetElementsByTagName("*");