c# - 从 blob 下载多个文件作为 Zip 文件夹

Question

我的文件位于 blob 存储中。那么我如何从文件夹中下载多个文件作为 zip

我正在尝试这段代码，它可以工作，但没有给我输出。意味着它没有开始 zip 下载。:字符串 zipFileName = "MyZipFiles.zip";

    using (var zipOutputStream = new 
    ZipOutputStream(HttpContext.Current.Response.OutputStream))
                    {
                    zipOutputStream.SetLevel(0);
                    HttpContext.Current.Response.BufferOutput = false;
                    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + zipFileName);
                    HttpContext.Current.Response.ContentType = "application/zip";
                    foreach (var filePath in fileUrl)
                        {
                            var filename = Path.GetFileName(filePath.filename);
                            var filebytes = filePath.filebyte.BlobByteArray;
                            var fileEntry = new ZipEntry(Path.GetFileName(filePath.filename))
                            {
                                Size = filebytes.Length
                            };
                        zipOutputStream.PutNextEntry(fileEntry);
                        zipOutputStream.Write(filebytes, 0, filebytes.Length);
                        }
                    zipOutputStream.Flush();
                    zipOutputStream.Close();                        
                }

我的文件网址包含:

            foreach (var item in obj)
            {
                em = new FileUrlForbyte();
                em.filename = item.FileName;
                em.url = objBlobHelper.GetFileByFileNameMultiple(item.ContainerName, item.SubFolderName + "/" + item.FileName, DateTime.Now.AddMinutes(2));
                em.filebyte = objBlobHelper.DownloadFileByFileNameForAdobe(item.ContainerName, item.SubFolderName + "/" + item.FileName);
                fileUrl.Add(em);
            }

为了更清楚:文件路径包含:文件名、文件网址和文件字节:

    [Route("api/Blob/getMultipleFileFromBlobByURI")]
    [HttpGet]
    public System.Web.Mvc.FileResult getMultipleFileFromBlobByURI(string containerName)        
    {           

        List<BlobStorageModel> obj = new JavaScriptSerializer().Deserialize<List<BlobStorageModel>>(containerName);
        try
        {               

            BlobHelper objBlobHelper = new BlobHelper(apiPrincipal);
            List<FileUrlForbyte> fileUrl = new List<FileUrlForbyte>();
            FileUrlForbyte em = new FileUrlForbyte();
            
            foreach (var item in obj)
            {
                em = new FileUrlForbyte();
                em.filename = item.FileName;
                em.url = objBlobHelper.GetFileByFileNameMultiple(item.ContainerName, item.SubFolderName + "/" + item.FileName, DateTime.Now.AddMinutes(2));
                em.filebyte = objBlobHelper.DownloadFileByFileNameForAdobe(item.ContainerName, item.SubFolderName + "/" + item.FileName);
                fileUrl.Add(em);
            }


            // Here we will create zip file & download
            string zipFileName = "MyZipFiles.zip";
            var fileName = string.Format("{0}_ImageFiles.zip", DateTime.Today.Date.ToString("dd-MM-yyyy") + "_1");
            var tempOutPutPath = System.Web.HttpContext.Current.Server.MapPath(Url.Content("/TempImages/")) + fileName;

            try
            { 
                using (var zipOutputStream = new ZipOutputStream(HttpContext.Current.Response.OutputStream))
                    {
                    zipOutputStream.SetLevel(9);
                    byte[] buffer = new byte[4096];
                    HttpContext.Current.Response.BufferOutput = false;
                    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" + zipFileName);
                    HttpContext.Current.Response.ContentType = "application/zip";
                    foreach (var filePath in fileUrl)
                        {

                      var filename = Path.GetFileName(filePath.filename);
                        var filebytes = filePath.filebyte.BlobByteArray;
                        var fileEntry = new ZipEntry(Path.GetFileName(filePath.filename))
                        {
                            Size = filebytes.Length
                        };
                        zipOutputStream.PutNextEntry(fileEntry);
                        zipOutputStream.Write(filebytes, 0, filebytes.Length);
                    }
                    zipOutputStream.Finish();
                    zipOutputStream.Flush();
                    zipOutputStream.Close();                        
                }
                byte[] finalResult = System.IO.File.ReadAllBytes(tempOutPutPath);
                if (System.IO.File.Exists(tempOutPutPath))
                    System.IO.File.Delete(tempOutPutPath);

                if (finalResult == null || !finalResult.Any())
                    throw new Exception(String.Format("No Files found with Image"));
               return new System.IO.File(finalResult, "application/zip", fileName);



            }
            catch (Exception)
            {
                throw;
            }

        }
        catch (Exception)
        {
            throw;
        }

    }

Answer 1

感谢@Sudheer 在评论中提供的意见。

I am trying this code from some time it is working but not giving me output.Means its not starting the zip download.: string zipFileName = “MyZipFiles.zip”;

引用上面的评论，我尝试了下面的代码并能够成功执行。

           CloudStorageAccount storage_Account = CloudStorageAccount.Parse(storageAccount_connectionString);
           CloudBlobClient blob_Client = storage_Account.CreateCloudBlobClient();

           CloudBlobContainer container = blob_Client.GetContainerReference(container_Name);
           CloudBlockBlob cloudBlockBlob = container.GetBlockBlobReference(filename);
           
           Stream file = File.OpenWrite(@"C:\Tools\" + filename);    
   
           cloudBlockBlob.DownloadToStream(file);

           Console.WriteLine("Download completed!");

然后，我在存储帐户中创建了一个容器，如下所示。

我们需要将 zip 文件上传到上述文件夹并运行给定的代码。

现在我可以看到我可以访问我的容器并下载位于容器内的 zip 文件。