restsharp发出多个异步请求

using RestSharp;
using System;
using System.Collections.Generic;
using System.Threading.Tasks;

class Program
{
    static async Task Main(string[] args)
    {
        var client = new RestClient("https://api.example.com");

        var requests = new List<IAsyncResult>();

        for (int i = 0; i < 5; i++)
        {
            var request = client.GetAsync($"resource/{i}");
            requests.Add(request);
        }

        foreach (var result in requests)
        {
            var response = await ((Task<IRestResponse>)result).ConfigureAwait(false);
            Console.WriteLine(response.Content);
        }
    }
}

using System.Collections.Concurrent;
using System.Linq;
using System.Threading;

class Program
{
    static async Task Main(string[] args)
    {
        var client = new RestClient("https://api.example.com");
        var semaphore = new SemaphoreSlim(3); // 控制并发数
        var results = new ConcurrentDictionary<int, string>();

        var tasks = new List<Task>();

        for (int i = 0; i < 5; i++)
        {
            int index = i;
            tasks.Add(Task.Run(async () =>
            {
                await semaphore.WaitAsync();
                try
                {
                    var response = await client.GetAsync($"resource/{index}").ConfigureAwait(false);
                    results[index] = response.Content;
                }
                finally
                {
                    semaphore.Release();
                }
            }));
        }

        await Task.WhenAll(tasks);

        var orderedResults = results.OrderBy(kvp => kvp.Key).Select(kvp => kvp.Value).ToList();
        foreach (var result in orderedResults)
        {
            Console.WriteLine(result);
        }
    }
}