The most efficient approach is to create a ZipArchive that writes directly to an output stream (like a MemoryStream for immediate download or a FileStream for saving locally). This avoids downloading all files to disk before zipping them.
For high-performance or large-scale zipping, consider these strategies: download multiple files from azure blob storage as zip c#
generate a Zip file from azure blob storage files - Stack Overflow The most efficient approach is to create a
To follow this guide, you will need the Azure.Storage.Blobs NuGet package installed in your C# project. 2. Core Logic: Streaming Blobs into a ZIP Best Practices for Large Downloads
Downloading multiple files from Azure Blob Storage as a single ZIP archive in C# is a common requirement for web applications and background services. This process typically involves streaming blobs into a ZipArchive to avoid high memory consumption and provide a better user experience. 1. Prerequisites
using Azure.Storage.Blobs; using System.IO.Compression; public async Task DownloadBlobsAsZipAsync(string connectionString, string containerName, List blobNames) { var containerClient = new BlobContainerClient(connectionString, containerName); using (var memoryStream = new MemoryStream()) { // Use 'leaveOpen: true' so the stream remains accessible after ZipArchive is disposed using (var zipArchive = new ZipArchive(memoryStream, ZipArchiveMode.Create, leaveOpen: true)) { foreach (var blobName in blobNames) { var blobClient = containerClient.GetBlobClient(blobName); // Create a new entry in the zip for this specific blob var zipEntry = zipArchive.CreateEntry(blobName, CompressionLevel.Optimal); using (var entryStream = zipEntry.Open()) { // Download directly from Azure into the zip entry's stream await blobClient.DownloadToAsync(entryStream); } } } memoryStream.Position = 0; return memoryStream.ToArray(); } } Use code with caution. 3. Best Practices for Large Downloads