using System;

using System.Collections.Generic;

using System.Linq;

​

namespace LINQ_List

{

    public class Program

    {

        public static void Main(string[] args)

        {

            List<int> ints = new List<int> { 3, 1, 2, 4 };

​

            var result = ints.Where((x, i) =>

            {

                if (x == i)

                {

                    Console.WriteLine(String.Format("{0}-{1}",x,i));

                    return true;

                }

                else

                {

                    return false;

                }

            }).Select((x, i) => new { x, i });

​

            foreach (var item in result)

            {

                Console.WriteLine(item);

            };

        }

    }

}

​