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Azure Blob Storage: How to Optimize Performance for Frequent Small File Uploads with C#?

👀 Views: 500 💬 Answers: 1 📅 Created: 2025-06-09
azure blob-storage performance csharp C#

I'm currently working on an Azure application that involves uploading frequent small files (around 5-10 KB each) to Azure Blob Storage using C#... I've noticed that the performance is quite poor, especially when the number of uploads increases. The current implementation uses the `CloudBlobContainer` class to upload files, but the response time seems to spike significantly when I try to upload files in rapid succession. Here is a snippet of the code I'm using: ```csharp CloudStorageAccount storageAccount = CloudStorageAccount.Parse(connectionString); CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient(); CloudBlobContainer container = blobClient.GetContainerReference("mycontainer"); await container.CreateIfNotExistsAsync(); foreach (var file in filesToUpload) { CloudBlockBlob blockBlob = container.GetBlockBlobReference(file.FileName); using (var stream = file.OpenReadStream()) { await blockBlob.UploadFromStreamAsync(stream); } } ``` I've tried implementing parallel uploads using `Task.WhenAll`, but that resulted in an `InvalidOperationException` indicating that the maximum number of concurrent connections has been exceeded. I also tried adjusting the `ServicePointManager.DefaultConnectionLimit` but it didn’t seem to yield any improvement. I wonder if there are best practices for optimizing the performance of frequent uploads in Azure Blob Storage, especially for smaller files. Is there a recommended approach to batch uploads or perhaps utilize a different method that could enhance performance? Any insights or sample code would be greatly appreciated! I'm developing on macOS with C#.