从url链接压缩多个pdf，如何

Question

I have a project that requires pdf files to be zipped up from an URL link and then downloaded and clickable by the end users browser. So far, I was able to zip one pdf file which isn't nearly what I'm looking to for.

I'm not sure how to proceed from here. Below is the code. Any help would be very much appreciated.

ASP.NET Core

        [HttpGet("zipFiles")]
        public IActionResult ZipPDFFiles()
        {
            var fileNames = _repo.GetFileNames();

            foreach (var filesName in fileNames)
            {
                var urlLink = "https://example.com/folder/" + $"{filesName.PdfFileName}";

                var net = new System.Net.WebClient();
                var data = net.DownloadData(urlLink);

                var file = $"{filesName.PdfFileName}";

                var contentType = "application/zip";

                string zippedFolderName = "Archive.zip";

                using (MemoryStream ms = new MemoryStream())
                {
                    using (var archive = new ZipArchive(ms, ZipArchiveMode.Create, true))
                    {
                        var zipArchiveEntry = archive.CreateEntry($"{file}", System.IO.Compression.CompressionLevel.Fastest);
                        using (var zipStream = zipArchiveEntry.Open()) zipStream.Write(data, 0, data.Length);
                    }
                    return File(ms.ToArray(), contentType, $"{zippedFolderName}");
                }

            }
            return NotFound();
        }

Answer 1

Some improvements:

• used HttpClient
• files uploaded simultaneously

        var fileUrls = new[]
        {
            new Uri("https://docs.microsoft.com/en-us/dotnet/standard/microservices-architecture/implement-resilient-applications/media/image3.5.png"),
            new Uri("https://docs.microsoft.com/en-us/dotnet/standard/microservices-architecture/implement-resilient-applications/media/image4.png"),
            new Uri("https://docs.microsoft.com/en-us/dotnet/standard/microservices-architecture/implement-resilient-applications/media/image6.png")
        };

        var downloadResults = fileUrls
            .Select(uri => (uri: uri, response: HttpClientFactory.Create().SendAsync(new HttpRequestMessage(HttpMethod.Get, uri))))
            .ToArray();

        await Task.WhenAll(downloadResults.Select(v => v.response));

        using (var ms = new MemoryStream())
        {
            using (var archive = new ZipArchive(ms, ZipArchiveMode.Create, true))
            {
                foreach (var download in downloadResults)
                {
                    var entry = archive.CreateEntry(download.uri.Segments.Last(), CompressionLevel.Fastest);

                    using (var zipStream = entry.Open())
                    {
                        var data = await download.response.Result.Content.ReadAsByteArrayAsync();

                        zipStream.Write(data, 0, data.Length);
                    }
                }
            }

            return File(ms.ToArray(), contentType, $"{zippedFolderName}");
        }