asp.net完成文件上传的代码教程

public class PictureController : Controller
  {
    private IHostingEnvironment hostingEnv;

    public PictureController(IHostingEnvironment env)
    {
      this.hostingEnv = env;
    }
    // GET: //
    public IActionResult Index()
    {
      return View();
    }
    public IActionResult UploadFiles()
    {
      return View();
    }
    [HttpPost]
    public IActionResult UploadFiles(IList files)
    {
      long size = 0;
      foreach (var file in files)
      {
        var filename = ContentDispositionHeaderValue
                .Parse(file.ContentDisposition)
                .FileName
                .Trim('"');
        //这个hostingEnv.WebRootPath就是要存的地址可以改下
        filename = hostingEnv.WebRootPath + $@"\{filename}";
        size += file.Length;
        using (FileStream fs = System.IO.File.Create(filename))
        {
          file.CopyTo(fs);
          fs.Flush();
        }
      }
      ViewBag.Message = $"{files.Count} file(s) /{ size}bytes uploaded successfully!";
       return View();
    }

  }

    public IActionResult UploadFilesAjax()
    {
      return View();
    }
    [HttpPost]
    public IActionResult UploadFilesAjax(string z) 
    {
      long size = 0;
      var files = Request.Form.Files;
      foreach (var file in files)
      {
        var filename = ContentDispositionHeaderValue
                .Parse(file.ContentDisposition)
                .FileName
                .Trim('"');
        filename = @"C:\Users\lg.HL\Desktop" + $@"\{filename}";    
        size += file.Length;
        using (FileStream fs = System.IO.File.Create(filename))
        {
          file.CopyTo(fs);
          fs.Flush();
        }
      }
      string message = $"{files.Count} file(s) / { size}bytes uploaded successfully!";
        return Json(message);
    }