using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace LinqExer2

{

    class Program

    {

        static void Main(string[] args)

        {

            //1、LINQ实例一

            //int[] number = { 2, 4, 3, 5, 7, 21, 34 };

            //var oddNum = from num in number where (num % 2 != 0) orderby num descending select num;

            //foreach (var num in oddNum)

            //{

            //    Console.WriteLine(num);

            //}

            // 2、LINQ实例二

            //var languages = new string[] { "Java","Java23", "C++", "C#", "C", "HPH", "VB", "VC++", ".NET" };

            //var query = from item in languages group item by item.Length into lengthGroups orderby lengthGroups.Key ascending select lengthGroups;

            //foreach (var item in query)

            //{

            //    Console.WriteLine(item.Key);

            //    foreach (var val in item)

            //    {

            //        Console.WriteLine(val);

            //    }

            //}

            // 3、LINQ实例三

            var objs = new object[] { "Java","C++","C#",,,};

            var query = objs.OfType<string>();

            foreach (var item in query)

            {

                Console.WriteLine("数据：{0}", item);

            }

            Console.ReadLine();

        }

    }

}