XML 基本语法

 static void Main(string[] args)
        {

            //构造Xml的方法 

            XElement xlement = new XElement("Customer");
            xlement.SetAttributeValue("id", "123");
            XElement FirstName = new XElement("Firstname","Joe");
            XElement SecondName = new XElement("SecondName", "Blogger");
            SecondName.Add(new XComment("nice name"));
            xlement.Add(FirstName);
            xlement.Add(SecondName);
            Console.WriteLine(xlement.ToString());



            //与上面代码不一样 但是都是构造xml的代码
            var d = new XElement("bench", new XElement("toolbox", new XElement("handtool", "hammer"), new XElement("handtool", "rasp")),
                new XElement("toolbox", new XElement("handtool", "saw"), new XElement("powertool", "Nail gun")));
            Console.WriteLine(d);


            foreach (var item2 in d.Elements())
            {
                foreach (var item in item2.Elements())
                {
                    Console.WriteLine(item.Value+" ");
                }
            }
            //上下两个编码方式不同 但是结果是一样 都是嵌套循环 上面为普通 ,下面为linq to xml
            //把d.Elements()的值赋值到了x中 然后再使用f来查询 x找出Xlement中Name为handtool的 可以查找出3个

            var fff = from x in d.Elements()
                      from t in x.Elements()
                      where t.Name == "handtool"
                      select t.Value;
            //递归 查d子节含有 handtool 不包含自己 要包含自己则使用 DescendantsAndSelf
    
            var dff = d.Descendants("handtool");

            foreach (var item in dff)
            {
                Console.WriteLine(item.ToString());
            }

            //d.DescendantNodes 与d.Descendants的区别 DescendantNodes查询出的是 子级显示一次 再子级显示一次 并且是无参方法
           //eg.

            var descendantNodes = d.DescendantNodes();
            //显示出来就知道区别

            foreach (var item in descendantNodes)
            {
                Console.WriteLine(item.ToString());
            }


            XElement settings = new XElement("settings", new XElement("timesout", new XElement("timesout2","d")));


           // settings.Add(new XElement("timeout", new XElement("timesout2", "ff")));  1
            //settings.SetElementValue("timesout", new XElement("timesout2", "ff"));    2
            //1 2 含义相同
            //settings.SetElementValue("time1sout", "60");



            //精确查找 在xelment中赋值
            settings.Descendants("timesout").Elements("timesout2").First().AddAfterSelf(new XElement("d","2"));
            //把XElment timesout2删除
            settings.Descendants("timesout").Elements("timesout2").Remove();
            //把
            settings.Descendants("timesout").Elements("d").First().ReplaceWith(new XElement("replace", "hehe"));

            //var dffs2 = from fff1 in settings.Descendants("timesout").Elements()
            //            where fff1.Name == "timesout2"
            //            select fff1;


            //foreach (var item in dffs2)
            //{
            //    item.AddAfterSelf("affter", "d3");
            //}
             Console.WriteLine(settings.ToString());
            Console.ReadKey();