Linqサンプル（Select・Where・OrderbyDescending・First・Last）

LinqSample

using System;
using System.Collections.Generic;
using System.Linq;

namespace LinqSample
{
    class Program
    {
        static void Main(string[] args)
        {
            // 1,2,3,4,5,6,7,8,9,10,
            var exampleList = Enumerable.Range(1, 10);
            var enumerable = exampleList as IList<int> ?? exampleList.ToList();
            foreach (var list in enumerable)
            {
                Console.WriteLine(list);
            }

            //2,4,6,8,10,12,14,16,18,20
            var ints = exampleList as IList<int> ?? enumerable.ToList();
            var times2 = ints.Select(x => x * 2);
            foreach (var list in times2)
            {
                Console.WriteLine(list);
            }

            //2,4,6,8,10
            var evenNumber = ints.Where(s => s % 2 == 0);
            foreach (var list in evenNumber)
            {
                Console.WriteLine(list);
            }

            //10,9,8,7,6,5,4,3,2,1
            var orderby = ints.OrderByDescending(x => x);
            foreach (var list in orderby)
            {
                Console.WriteLine(list);
            }

            //1
            var first = ints.First();
            Console.WriteLine(first);

            //10
            var end = ints.Last();
            Console.WriteLine(end);
        }
    }
}