linq to xml 简单的增、删、改、查、保存xml文件操作

来源：互联网发布：淘宝女童鞋品牌大全编辑：程序博客网时间：2024/05/01 23:55
转自：http://www.cnblogs.com/zoro-zero/p/3983205.html
using System;using System.Collections;using System.Configuration;using System.Data;using System.Linq;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.HtmlControls;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Xml.Linq;using System.IO;using System.Xml;namespace test{    public partial class xmlDemo : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {        }        //使用XmlDocument创建xml文件        protected void Button1_Click(object sender, EventArgs e)        {            string dirPath = Server.MapPath("/xml");            DirectoryInfo dir = new DirectoryInfo(dirPath);            if (!dir.Exists)            {                dir.Create();            }            //创建xml文件            XmlDocument xdoc = new XmlDocument();            //创建xml描述            XmlDeclaration xdec = xdoc.CreateXmlDeclaration("1.0", "utf-8", null);            xdoc.AppendChild(xdec);            //创建xml跟节点            XmlElement xroot = xdoc.CreateElement("persons");            xdoc.AppendChild(xroot);            //创建节点            XmlElement xper = xdoc.CreateElement("person");            xroot.AppendChild(xper);            //对person节点设置属性            xper.SetAttribute("id", "0001");                        //创建person节点下的子节点            //person节点下创建name节点            XmlElement xname = xdoc.CreateElement("name");            xper.AppendChild(xname);            XmlText textName = xdoc.CreateTextNode("test");            xname.AppendChild(textName);            //person节点下创建age节点            XmlElement xage = xdoc.CreateElement("age");            xper.AppendChild(xage);            XmlText textAge = xdoc.CreateTextNode("20");            xage.AppendChild(textAge);            //person节点下创建sex节点            XmlElement xsex = xdoc.CreateElement("sex");            xper.AppendChild(xsex);            XmlText textsex = xdoc.CreateTextNode("男");            xsex.AppendChild(textsex);            //保存xml文件            xdoc.Save(dirPath+"/"+"person.xml");            Response.Write("创建xml文件成功");        }        //使用linq to xml创建xml文件        protected void Button2_Click(object sender, EventArgs e)        {            string dirPath = Server.MapPath("/xml");            DirectoryInfo dir = new DirectoryInfo(dirPath);            if (!dir.Exists)            {                dir.Create();            }            XDocument xdoc = new XDocument();            //使用XDocument 可以不需要document描述            //创建跟节点            XElement root = new XElement("root");            //添加跟节点            xdoc.Add(root);            //创建person节点            XElement per = new XElement("person");            //添加person节点            root.Add(per);            //创建属性节点            XAttribute xId = new XAttribute("id", "0002222");            //name节点            XElement name = new XElement("name", "test");            //age节点            XElement age = new XElement("age", "22");            //sex节点            XElement sex = new XElement("sex", "男");            //对person节点添加id属性 以及name sex age节点            per.Add(xId,name, sex, age);            //保存linq to xml 文件            xdoc.Save(dirPath + "/" + "linqToXml.xml");            Response.Write("linq to xml保存文件成功");                    }        //使用linq to xml 批量添加person节点        //xDocument.Root.Add()  批量添加        protected void Button3_Click(object sender, EventArgs e)        {            string dirPath = Server.MapPath("/xml");            DirectoryInfo dir = new DirectoryInfo(dirPath);            if (!dir.Exists)            {                dir.Create();            }            XDocument xdoc = new XDocument();            //使用XDocument 可以不需要document描述            //创建跟节点            XElement root = new XElement("root");            xdoc.Add(root);            Random r = new Random();            for (int i = 1; i <= 100;i++ )            {                //person节点                XElement per = new XElement("person");                //id属性                XAttribute xId = new XAttribute("id", i);                //name                XElement name = new XElement("name","test"+i);                //age                XElement age = new XElement("age",r.Next(18,30));                //sex                XElement sex = new XElement("sex", "男女"[r.Next(2)]);                per.Add(xId, name, sex, age);                xdoc.Root.Add(per);            }            //保存linq to xml 文件            xdoc.Save(dirPath + "/" + "personList.xml");            Response.Write("linq to xml批量添加成功");        }        //linq to xml 查找节点        protected void Button5_Click(object sender, EventArgs e)        {            string path = Server.MapPath("/xml/personList.xml");            XDocument xdoc = XDocument.Load(path);            var query = xdoc.DescendantNodes().Where(                    el => {                        //将el转为XElement对象                        XElement xe = el as XElement;                        if (xe == null)                        {                            return false;                        }                        //找到age节点                        XElement xAge = xe.Element("age");                        //找到sex节点                        XElement xSex = xe.Element("sex");                        if(xAge !=null && xSex !=null)                        {                            int age = Convert.ToInt32(xAge.Value);                            string sex = xSex.Value;                            if (age >= 20 && age <= 25 && sex == "女")                             {                                return true;                            }                        }                        return false;                    }                );            //将查到的节点保存到xml文件中            string savePath = Server.MapPath("/xml/search.xml");            XDocument saveXdoc = new XDocument();            XElement root = new XElement("root");            saveXdoc.Add(root);            root.Add(query);            saveXdoc.Save(savePath);            Response.Write("linq to xml查找成功");        }        //linq to xml 修改节点        protected void Button4_Click(object sender, EventArgs e)        {            string path = Server.MapPath("/xml/personList.xml");            XDocument xdoc = XDocument.Load(path);            var query = from p in xdoc.Descendants("person")                        where Convert.ToInt32(p.Attribute("id").Value) ==1                        select p;           var  first = query.FirstOrDefault();           if (first != null)            {                XElement searchElement = first as XElement;                XElement xname = searchElement.Element("name");                xname.Value = "刘德华";                xdoc.Save(path);                Response.Write("linq to xml修改成功");            }        }        //linq to xml 添加节点        protected void Button6_Click(object sender, EventArgs e)        {            string path = Server.MapPath("/xml/personList.xml");            XDocument xdoc = XDocument.Load(path);            //找到根节点            XElement root = xdoc.Element("root");            XElement xPer = new XElement("person");            XAttribute xid = new XAttribute("id", "9999");            XElement xName = new XElement("name","张学友");            XElement xSex = new XElement("sex","男");            XElement xAge = new XElement("age","99");            root.Add(xPer);            xPer.Add(xPer, xid, xName, xAge, xSex);            xdoc.Save(path);            Response.Write("添加成功");        }        //linq to xml 删除节点        protected void Button7_Click(object sender, EventArgs e)        {            string path = Server.MapPath("/xml/personList.xml");            XDocument xdoc = XDocument.Load(path);            var query = from p in xdoc.Descendants("person")                        where Convert.ToInt32(p.Attribute("id").Value) == 1                        select p;            var first = query.FirstOrDefault();            if (first != null)            {                XElement searchElement = first as XElement;                searchElement.Remove();                xdoc.Save(path);                Response.Write("linq to xml删除成功");            }        }    }}
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