using System;

using System.Collections.Generic;

using System.Threading;

using System.Threading.Tasks;

using System.Collections.Concurrent;

using System.Linq;

​

public class Program

{

    static async Task Main(string[] args)

    {

        int loopNumber = 1;

        var requestTasks = new List<int>

        {

            1000,

            2000,

            3000,

            4000,

            8000,

        }.AsParallel().Select(i => Task.Run(async () => await MetodoAssincrono2(i, loopNumber))).ToList();  

​

        //Console.WriteLine(requestTasks.GetType() == typeof(List<Task>));

        while (requestTasks.Any())

        {

             var completedTask = await Task.WhenAny(requestTasks);          

             Console.WriteLine(nameof(completedTask));

             requestTasks.Remove(completedTask);

             loopNumber++;

        }

        //Console.WriteLine("OK");

        return;

    }

​

​

    static async Task MetodoAssincrono2(int secons, int loopNumber)

    {

        // Simular operação assíncrona

        await Task.Delay(secons);

        Console.WriteLine($"Método assíncrono loop number {loopNumber} seconds {secons}");

    }

}