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private IActionResult DownloadZipFromUrl(string[] guids,string zipFullName) ???????{ ???????????using (MemoryStream zipStream = new MemoryStream()) ???????????{ ???????????????using (System.Net.WebClient webClient = new System.Net.WebClient()) ???????????????{ ???????????????????using (var archive = new ZipArchive(zipStream, ZipArchiveMode.Create, leaveOpen: true)) ???????????????????{ ???????????????????????foreach (var m in guids) ???????????????????????{ ???????????????????????????if (string.IsNullOrWhiteSpace(m)) continue; ???????????????????????????if (m == Guid.Empty.ToString()) continue; ???????????????????????????#region build url : https://****/upload/image?g=353e7e1b-69ae-4a60-8cfc-3737c2a64eaa&j=false ???????????????????????????var builder = new UriBuilder() ???????????????????????????{ ???????????????????????????????Scheme = Request.Scheme, ???????????????????????????????Host = Request.Host.Host, ???????????????????????????????Path = "upload/image", ???????????????????????????????Query = "j=false&g=" + m, ???????????????????????????}; ???????????????????????????if (Request.Host.Port != null) ???????????????????????????{ ???????????????????????????????builder.Port = Request.Host.Port.Value; ???????????????????????????} ???????????????????????????#endregion ???????????????????????????webClient.DownloadDataCompleted += wc_DownloadDataCompleted; ???????????????????????????var attachmentData = webClient.DownloadData(builder.Uri); ???????????????????????????ZipArchiveEntry entry = archive.CreateEntry(string.IsNullOrWhiteSpace(_DownloadAttachmentFileName) ? "File1.pdf" : _DownloadAttachmentFileName, System.IO.Compression.CompressionLevel.Fastest); ???????????????????????????using (var entryStream = entry.Open()) ???????????????????????????{ ???????????????????????????????entryStream.Write(attachmentData); ???????????????????????????} ???????????????????????} ???????????????????} ???????????????}// disposal of archive will force data to be written to memory stream. ???????????????zipStream.Position = 0; //reset memory stream position. ???????????????return File(zipStream.ToArray(), "application/vnd.ms-excel", zipFullName); ???????????} ???????}

private string _DownloadAttachmentFileName = string.Empty; ???????private void wc_DownloadDataCompleted(object sender, DownloadDataCompletedEventArgs e) ???????{ ???????????WebClient wc = sender as WebClient; ???????????// Try to extract the filename from the Content-Disposition header ???????????if (!String.IsNullOrEmpty(wc.ResponseHeaders["Content-Disposition"])) ???????????{ ???????????????_DownloadAttachmentFileName = wc.ResponseHeaders["Content-Disposition"].Substring(wc.ResponseHeaders["Content-Disposition"].IndexOf("filename=") + 10).Replace("\"", ""); //FileName ok ??????????????????????????} ???????????var data = e.Result; //File OK ???????}