Zipping files and uploading to Azure Blobstorage using filestream - azure

Question

I am creating a website with ASP.NET Core, and I need to take a bunch of files, zip them together and then upload them to Azure Blobstorage.
It succeeds, I get a downloadlink but when I download the file, I just get a "File" that I cannot open with anything.
Here's the code that handles the uploading:
var moduleVersionReleaseFiles = _appDbContext
.ModuleVersionReleaseFile
.Where(x => x.ModuleVersionReleaseId == moduleVersionReleaseId)
.ToList();
string AzureBlobStorageConfig = _configuration["AzureBlobStorage"];
var connectionString = _configuration["StorageConnectionString"];
string containerName = moduleVersionReleaseId + "-" + Guid.NewGuid().ToString();
BlobServiceClient blobServiceClient = new BlobServiceClient(connectionString);
BlobContainerClient containerClient = await blobServiceClient.CreateBlobContainerAsync(containerName.ToLowerInvariant(), Azure.Storage.Blobs.Models.PublicAccessType.BlobContainer);
BlobClient blobClient = containerClient.GetBlobClient(moduleVersionReleaseId.ToString());
using var stream = new MemoryStream();
using (var archive = new ZipArchive(stream, ZipArchiveMode.Create))
{
foreach (var moduleVersionReleaseFile in moduleVersionReleaseFiles)
{
var entry = archive.CreateEntry(moduleVersionReleaseFile.File);
using (var entryStream = entry.Open())
using (var fileStream = File.OpenRead($"{moduleVersionReleaseFile.Path}\\{moduleVersionReleaseFile.File}"))
{
await fileStream.CopyToAsync(entryStream);
}
}
stream.Position = 0;
await blobClient.UploadAsync(stream, true);
await stream.FlushAsync();
}
return blobClient.Uri.ToString();
I am using Azurite for testing, so I can't log onto the blobstorage and check there.
Why am I not getting a zip file when downloading the file as expected?

Answer 1

The reason you're not able to open the zip file is because it is not getting saved properly. Can you please try with the following code:
using var stream = new MemoryStream();
using (var archive = new ZipArchive(stream, ZipArchiveMode.Create))
{
foreach (var moduleVersionReleaseFile in moduleVersionReleaseFiles)
{
var entry = archive.CreateEntry(moduleVersionReleaseFile.File);
using (var entryStream = entry.Open())
var fileContents = File.ReadAllBytes($"{moduleVersionReleaseFile.Path}\\{moduleVersionReleaseFile.File}"));
using (BinaryWriter zipFileBinary = new BinaryWriter(entryStream))
{
zipFileBinary.Write(fileContents);
}
}
stream.Position = 0;
await blobClient.UploadAsync(stream, true);
}