using System;

using System.Collections.Generic;

using System.Threading;

using System.Threading.Tasks;

using System.Net.Http;

using Microsoft.Extensions.DependencyInjection;

​

public class Program

{

    private static readonly IHttpClientFactory _clientFactory = new ServiceCollection().AddHttpClient().BuildServiceProvider().GetService<IHttpClientFactory>();

    static string CurrentTime() => DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss.fff");

​

    public static async Task<bool> ProcessValue(int item)

    {

        Console.WriteLine($"{CurrentTime()} Thread: {Thread.CurrentThread.ManagedThreadId.ToString().PadLeft(6, '0')} - {item.ToString().PadLeft(3, '0')}.");

        HttpRequestMessage requestMessage = new(HttpMethod.Get, "https://postman-echo.com/get");

        HttpClient httpClient = _clientFactory.CreateClient();

        HttpResponseMessage responseMessage = await httpClient.SendAsync(requestMessage);

        Console.WriteLine($"{CurrentTime()} Thread: {Thread.CurrentThread.ManagedThreadId.ToString().PadLeft(6, '0')} - {item.ToString().PadLeft(3, '0')} - {responseMessage.StatusCode}.");

        return true;

    }

​

    public static void Main()

    {

        int ThreadLimit = 50;

        int workerThreads;

        int portThreads;

        ThreadPool.GetMaxThreads(out workerThreads, out portThreads);

        Console.WriteLine($"{CurrentTime()} Thread: {Thread.CurrentThread.ManagedThreadId.ToString().PadLeft(6, '0')} - Start. ThreadLimit: {ThreadLimit}, workerThreads: {workerThreads}, portThreads: {portThreads}.");

        List<int> il = new();

        for(int i = 0; i < 100; i++)

        {

            il.Add(i);

        }

        List<Task> tasks = new();

        foreach(int item in il)

        {

            tasks.Add(ProcessValue(item));

            if(tasks.Count >= ThreadLimit)

            {

                Task.WaitAll(tasks.ToArray());

            }

        }

        Console.WriteLine($"{CurrentTime()} Thread: {Thread.CurrentThread.ManagedThreadId.ToString().PadLeft(6, '0')} - Done.");

        Console.ReadKey();

    }

}