using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;namespace demo_linq_select{    class Program    {        static void Main(string[] args)        {            int[] a = new int[] {1, 2, 3, 4, 5};            //select 为必选关键字 为前面满足条件的选择输出 返回结果为返回IEnumerable
     
      泛型接口            IEnumerable
      
        result = from r in a where r < 3 select r;            Console.WriteLine(result.ToList());            foreach (var t in result)            {                Console.WriteLine(t);            }            //匿名对象            var obj = new { name = "leo", sex = "male" };            Console.WriteLine(obj.name);            Console.WriteLine(obj.sex);            //LINQ高级扩展方式            var result1 = a.Where(t => t < 3).Select(r => r); //where参数FUNC
       
        委托， 这里Select不是必须，            //使用select实现对查询结果进行过滤，转换为一个新的对象等            foreach (var t in result1)            {                Console.WriteLine(t);            }            var result2 = a.First();            Console.WriteLine(result2);            //Skip 跳过指定数量的元素            var result3 = a.Skip(2).Where(r => r >= 4);            print
        
         (result3);            //联合查询            var b = new int[] {3, 4, 5, 6};            var result4 = from c in a from d in b where c == d select c + d;            print
         
          (result4);            Console.ReadKey();        }        static void print
          
           (IEnumerable
           
             result) { foreach (var t in result) { Console.WriteLine(t); } } }}