using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Xml.Linq;

namespace Linq

{

    class Program

    {

        static void Main(string[] args)

        {

            //初始化要查询的数据

            List<int> inputArray = new List<int>();

            for (int i = ; i < ; i++)

            {

                inputArray.Add(i);

            }

            Console.WriteLine("使用Linq方法来对集合对象查询，查询结果为：");

            LinqQuery(inputArray);

            Console.WriteLine("\n\r使用Linq方法来查询xml:\n");

            LinqToXML();

            Console.ReadKey();

        }

        //使用linq返回集合中为偶数的元素

        private static void LinqQuery(List<int> collection)

        {

            var queryResult = from item in collection

                              where item %  ==  || item == //组合查询条件

                              orderby item descending//倒序排序

                              select item;

            //输出结果

            foreach (var item in queryResult)

            {

                Console.WriteLine(item.ToString() + "  ");

            }

        }

        //初始化xml数据

        private static string xmlstring =

             @"<books>

              <book>

              <author>Jack Herrington</author>

              <title>PHP Hacks</title>

              <publisher>O'Reilly</publisher>

              </book>

              <book>

              <author>Jack Herrington</author>

              <title>Podcasting Hacks</title>

              <publisher>O'Reilly</publisher>

              </book>

              <book>

              <author>藏锋</author>

              <title>深入在线工具</title>

              <publisher>啦啦啦出版社</publisher>

              </book>

              </books>";

        /// <summary>

        /// 使用Linq对XML文件进行查询

        /// </summary>

        private static void LinqToXML()

        {

            //导入xml

            XElement xmlDoc = XElement.Parse(xmlstring);

            //创建查询，获取作者为“王小为”的元素

            var queryResult = from element in xmlDoc.Elements("book")

                              where element.Element("author").Value == "藏锋"

                              select element;

            //输出查询结果

            foreach (var item in queryResult)

            {

                Console.WriteLine("书名：" + item.Element("title").Value + " 作者:" + item.Element("author").Value + " 出版社:" + item.Element("publisher").Value);

            }

        }

    }

}