C# linq语句学习

using System;
using System.Linq;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] arr = { 1, 2, 3, 4, 5, 6 };
            var a = from num in arr
                    where num % 2 == 0
                    select num;
            foreach (var i in a)
            {
                Console.WriteLine(i);
            }
            Console.ReadKey();
            var b = arr.Where(x => x % 2 == 0).OrderBy(n=>n);

            foreach (var i in b)
            {
                Console.WriteLine(i);
            }
            Console.ReadKey();
        }
    }
}