using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        bool IsDebugEnabled = false;

        var strings = GetValues(IsDebugEnabled);

        for (int i = 0; i < strings.Count(); i++)

        {

            var item = strings.ElementAt(i);

            if (IsDebugEnabled) Console.WriteLine($"item {i}");

        };

    }

​

    public static IEnumerable<string> GetValues(bool IsDebugEnabled)

    {

        for (int j = 0; j < 5; j++)

        {

            if (IsDebugEnabled) Console.WriteLine($"yield {j}");

            yield return j.ToString();

        }

    }

}