using System;

using System.Linq;

using System.IO;

using System.Net.Http;

using System.Threading.Tasks;

using System.Threading;

using System.Collections.Generic;

​

namespace Test

{

    public class Program

    {

        public static void Main()

        {

            var customers = GetCustomers();

​

            var count = customers.Count();

            Console.WriteLine($"There are {count} customers");

​

            foreach (var customer in customers)

            {

                Console.WriteLine(customer);

            }

        }

​

        static IEnumerable<Customer> GetCustomers()

        {

            //Представим, что почитали из файла

            //var lines = await File.ReadAllLinesAsync("./customers.csv");

​

            Console.WriteLine("Reading from file..");

​

            Thread.Sleep(1000);

​

            var lines = new List<string>(2)

            {

                "Customer1_FullName,31",

                "Customer2_FullName,32"

            };

​

            foreach (var line in lines)

            {

                var splitLine = line.Split(',');

                yield return new Customer(splitLine[0], int.Parse(splitLine[1]));

            }

        }

​

        record Customer(string FullName, int Age);

    }

}