使用 ZipArchive C# 将压缩的 Byte[] 下载到磁盘

Question

I have a compressed byte array that I would like to download to the server as a.zip file. Using the following code, the file size shows the correct compressed size. But when I go to open the file it says the.zip file is invalid. Do I need to somehow set the content type to application/zip?

using var compressedStream = new MemoryStream(fileBytes);
var fileStream = new FileStream(@"<file directory\xxx.zip", FileMode.Create, FileAccess.Write);
            compressedStream.CopyTo(fileStream);
            fileStream.Dispose();

File was zipped using the following snippet:

 byte[]? archiveFile = Array.Empty<byte>();
                        byte[]? fileBytes = System.IO.File.ReadAllBytes(file);

                        using var archiveStream = new MemoryStream();

                        using (var archive = new ZipArchive(archiveStream, ZipArchiveMode.Create, true))
                        {
                            var zipArchiveEntry = archive.CreateEntry(file, CompressionLevel.SmallestSize);
                            using var zipStream = zipArchiveEntry.Open();
                            zipStream.Write(fileBytes, 0, fileBytes.Length);
                        }

                        archiveFile = archiveStream.ToArray();

Answer 1

Lately I'm busy building a service which retrieves files from an API as a byte[] with a list of properties, one of them containing the file extension. The service stores these files in a Blob Storage with the right file extension. To create a file from a byte[] you can use the following code.

File.WriteAllBytes("somePath/file.zip", theByteArray);

File can be found in the given path. If you don't specify a specific path the file will be found in the somewhere inside the 'bin' folder of your project after a completed run. Remember to add the.zip extension in your first argument or else a file will be created with no extension. Pass in as a second argument a byte[] . Works fine here.