c# curl如何实现多线程下载

在C#中，可以使用HttpClient类和Task类来实现多线程下载。以下是一个简单的示例代码，演示如何使用多线程下载多个文件：

using System; using System.Net.Http; using System.Threading.Tasks;  class Program {     static async Task Main(string[] args)     {         string[] urls = { "url1", "url2", "url3" }; // 定义要下载的文件URL          var tasks = new Task[urls.Length];          for (int i = 0; i < urls.Length; i++)         {             tasks[i] = DownloadFile(urls[i]);         }          await Task.WhenAll(tasks);          Console.WriteLine("All files downloaded successfully.");     }      static async Task DownloadFile(string url)     {         using (var client = new HttpClient())         {             var response = await client.GetAsync(url);              if (response.IsSuccessStatusCode)             {                 var fileName = url.Substring(url.LastIndexOf('/') + 1);                  using (var fileStream = System.IO.File.Create(fileName))                 {                     await response.Content.CopyToAsync(fileStream);                 }                  Console.WriteLine($"File {fileName} downloaded successfully.");             }             else             {                 Console.WriteLine($"Failed to download file from {url}. Status code: {response.StatusCode}");             }         }     } } 

在上面的代码中，我们通过Task类创建了多个下载文件的任务，并使用Task.WhenAll方法等待所有任务完成。每个下载任务都使用HttpClient类来发送HTTP请求并下载文件。当所有文件下载完成后，会输出"All files downloaded successfully."。