Linq对XML的操作

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml.Linq;

namespace LinQToXML
{
    class Program
    {
        static void Main(string[] args)
        {

            string xml =Path.Combine(AppDomain.CurrentDomain.BaseDirectory,"CompanyXml.xml");

            //***********************************LinQ创建XML****************************************
            //XElement xe = new XElement("Company",//    new XElement("CompanyName","特维科技"),//    new XElement("CompanyAddress","科技园"),//    new XElement("CompanyTel","1808833456"),//    new XElement("CompanyBos",//        new XElement("Name","马化疼"),//        new XElement("Age","46"),//        new XElement("Sex","男")),//    new XElement("Country","ShenZhen"));
            //Console.WriteLine(xe.ToString());
            //XDocument xd = new XDocument(xe);
            //xd.Save(xml);


            //***************************XNamespace对象表示XML名称空间*************************************
            //XNamespace ns = "http://www.baidu.com/ns/1";
            //XElement xe = new XElement(ns+"Company",//  new XElement("CompanyName",//  new XElement("CompanyAddress",//  new XElement("CompanyTel",//  new XElement("CompanyBos",//      new XElement("Name",//      new XElement("Age",//      new XElement("Sex",//  new XElement("Country","ShenZhen"));
            //Console.WriteLine(xe.ToString());


            //**************************XComment可以在XML文档中任意添加注释********************************
            //XDocument xdoc=new XDocument();
            //xdoc.Add(new XComment("这是一个开头注释：开始创建XML文档"));
            //XElement xe = new XElement("Company",//  new XComment("公司的地址是：科技园"),"ShenZhen"));
            //Console.WriteLine(xe.ToString());
            //xdoc.Add(xe);
            //xdoc.Save(xml);


            //*********************************XAttribute对象用来添加和使用特性******************************
            //XDocument xdoc = new XDocument();
            //XElement xe = new XElement("Company",//  new XAttribute("特别属性","中国500强"),//      new XAttribute("公司地址面积","不详"),//      "科技园"),"李开放"),"ShenZhen"));
            //Console.WriteLine(xe.ToString());
            //xdoc.Add(xe);
            //xdoc.Save(xml);

            //************************************LinQ对XML的查询*****************************************
            if (File.Exists(xml))
            {
                XDocument xdoc = XDocument.Load(xml);
                var info = from c in xdoc.Descendants("CompanyName")
                           select c.Value;
                //等同于==
                var info1 = xdoc.Descendants("CompanyName").Select(x => x.Value);
                Console.WriteLine("Name的个数:{0}",info.Count());
                foreach (var item in info)
                {
                    Console.WriteLine(item);
                }



                var info2 = from c in xdoc.Descendants("CompanyBos")
                            select new
                            {
                                Name = from n in c.Elements("Name")
                                       select new { name = n.Value },Age = c.Element("Age").Value,Sex = c.Element("Sex").Value
                            };
                Console.WriteLine("CompanyBos的子集数:{0}",info2.Count());
                foreach (var item in info2)
                {
                    foreach (var n in item.Name)
                    {
                        Console.WriteLine("Name:{0}",n.name);
                    }
                    Console.WriteLine(string.Format("Age:{0}nSex:{1}",item.Age,item.Sex));
                }
                //等同于==
                IEnumerator<XElement> xles = xdoc.Element("Company").Elements("CompanyBos").GetEnumerator();
                while (xles.MoveNext())
                {
                    XElement xe = xles.Current;
                    int count = xe.Elements("Name").Count();
                    IEnumerator<XElement> names = xe.Elements("Name").GetEnumerator();
                    while (names.MoveNext())
                    {
                        XElement nameXe = names.Current;
                        string name = nameXe.Value;
                        Console.WriteLine("Name:{0}",name);
                    }
                    string age = xe.Element("Age").Value;
                    string sex = xe.Element("Sex").Value;
                    Console.WriteLine(string.Format("Age:{0}nSex:{1}",age,sex));
                }
                Console.WriteLine(xdoc);

                //string value = xdoc.Element("CompanyName").Value;//这种是错误的写法，不能越级查询某节点的值
                string value = xdoc.Element("Company").Element("CompanyName").Value;
                Console.WriteLine(value);
            }


            //****************************LinQ对XML的修改、增加、删除************************************
            //if (File.Exists(xml))
            //{
            //    XDocument xdoc = XDocument.Load(xml);
                //Console.WriteLine(xdoc.Element("Company").Element("CompanyName").Value);
                //Console.WriteLine("Company修改为：");
                //xdoc.Element("Company").Element("CompanyName").SetValue("HuaWei");
                //xdoc.Element("Company").Element("CompanyName").ReplaceAll("LanXiang");
                //Console.WriteLine(xdoc.Element("Company").Element("CompanyName").Value);
                //Console.WriteLine(xdoc);

                //xdoc.Element("Company").AddFirst(new XElement("CreatYear","1988年"));//在Company首行增加CreatYear
                //xdoc.Element("Company").Add(new XElement("CreatYear","1988年"));//在Company尾行增加CreatYear

                //xdoc.Element("Company").Element("CompanyName").RemoveAll();//移除节点和属性
                //xdoc.Element("Company").Element("CompanyName").Remove();//此处删除此节点
                //xdoc.Element("Company").Element("CompanyName").RemoveAttributes();//移除属性

                //XAttribute abb=xdoc.Element("Company").Attribute("特别属性");//修改属性
                ////abb.SetValue("经济强国");
                //abb.Value = "经济强国";

               
            //}
            Console.ReadKey();
        }

    }
}

（编辑：李大同）

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