How to Unzip Azure Blobs programmatically using Memory Streams in Azure WebJOBs | José Quinto

Introduction

Recently I had to extract files from a .zip file stored on Azure Blob Storage in Azure WebJob process.

The approach

This is what I did from scratch:

1. Create WebJob project

2. Create Non-continuous Azure WebJob

   static void Main()
   {
     var host = new JobHost();
     host.Call(typeof(Functions).GetMethod(“MyMethod”));
   }
   
   public class Functions
   {
     [NoAutomaticTrigger]
     public static void MyMethod()
     {
       // code
     }
   }

3. Install WindowsAzure.ConfigurationManager and WindowsAzure.Storage nuget packages.

   Install-Package Microsoft.WindowsAzure.ConfigurationManager
   Install-Package WindowsAzure.Storage

4. Add System.IO.Compression.dll from system dlls.

5. Add this code:

Important notes

• Previously we need to create Azure Storage Account and get the storageAccountName and storageAccountKey.
• CloudConfigurationManager is able to retrieve settings firdt from Azure WebApp Settings UI and secondly from App.config file.
• We must create a new Blob Container and change in the code (or add a new app setting).
• ZipArchive is the system native approach to unzip files.
• Isn’t needed store temporary files to unzip and I have tested files until 150 MB (10MB compressed) on WebJobs working fine.