Httpclient获取下载速度

using System;
using System.Diagnostics;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;

public class Program
{
    public static async Task Main()
    {
        string fileUrl = "https://example.com/file.txt"; // 替换为要下载的文件的URL

        using (HttpClient client = new HttpClient())
        {
            Stopwatch stopwatch = Stopwatch.StartNew();

            using (HttpResponseMessage response = await client.GetAsync(fileUrl))
            {
                using (Stream stream = await response.Content.ReadAsStreamAsync())
                {
                    // 下载文件的逻辑，可以根据实际需求进行处理
                    // 例如，将文件保存到本地磁盘
                    using (FileStream fileStream = File.Create("downloaded_file.txt"))
                    {
                        await stream.CopyToAsync(fileStream);
                    }
                }
            }

            stopwatch.Stop();

            long fileSize = new FileInfo("downloaded_file.txt").Length;
            TimeSpan downloadTime = stopwatch.Elapsed;

            double downloadSpeed = fileSize / downloadTime.TotalSeconds;

            Console.WriteLine($"下载速度：{downloadSpeed} bytes/second");
        }
    }
}