.net与XML——LINQ To Xml

入门的，先举一例

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;

namespace mylqConApp
{
    class lqxml
    {
        static void Main()
        {

            XDocument doc = new XDocument(
                new XDeclaration("1.0", "utf-8", "yes"),
                //元素节点
                new XElement("books",
                    new XElement("Book",
                        new XAttribute("ID", "1"),
                        new XElement("NO", "1254-004"),
                        new XElement("Name", "Book 004"),
                        new XElement("Price", "30.00"),
                        new XElement("Remark", "this is a book about conputer")
                    ),
                    new XElement("Book",
                        new XAttribute("ID", "2"),
                        new XElement("NO", "1254-005"),
                        new XElement("Name", "Book 005"),
                        new XElement("Price", "35.00"),
                        new XElement("Remark", "this is a book about conputer")
                    ),
                    new XElement("Book",
                        new XAttribute("ID", "3"),
                        new XElement("NO", "1254-015"),
                        new XElement("Name", "Book 015"),
                        new XElement("Price", "135.00"),
                        new XElement("Remark", "this is a book about conputer")
                    )
               )
            );

            //Serialize this System.Xml.Linq.XDocument to a file.
            doc.Save("c:\\tt.xml");

            //Creates a new System.Xml.Linq.XDocument from a file.
            XDocument xdoc = XDocument.Load("c:\\tt.xml");
            Console.WriteLine(xdoc.ToString());

            //查询根元素名称
            IEnumerable<XElement> root = from e in xdoc.Elements("books")
                                         select e;

            foreach (var s in xdoc.Elements())
            {
                Console.WriteLine(s.Name);
            }
            foreach (XElement xe in root)
            {
                Console.WriteLine("查询根元素名称 " + xe.Name);
            }

            //Loads an System.Xml.Linq.XElement from a file
            XElement xElem = XElement.Load("c:\\tt.xml");
            //查询指定名称的元素

            IEnumerable<XElement> ele = from e in xElem.Elements("Book")
                                        where (string)e.Element("Name") == "Book 005"
                                        select e;
            //或者
            //IEnumerable<XElement> ele = from e in xdoc.Elements("books").Elements("Book")
            //                            where (string)e.Element("Name") == "Book 005"
            //                            select e;

            foreach (var u in ele)
            {
                Console.WriteLine("ID " + u.Attribute("ID").Value + " name " + u.Name);
            }

            //Add
            XElement book = new XElement("Book",
                        new XAttribute("ID", "4"),
                        new XElement("NO", "1254-045"),
                        new XElement("Name", "Book 045"),
                        new XElement("Price", "135.00"),
                        new XElement("Remark", "this is a book about conputer"));
            xElem.Add(book);
            //生成添加新元素之后的xml文件
            xElem.Save("c:\\t.xml");



        }
    }
}

真的是入门级的，自己留着看看……