How to download bulk files from azure blob storage using asp net core webapi in

Introduction

ASP.NET is a popular language used for building web applications. One common requirement in web development is the ability to download multiple files from a system, such as Blob Storage. In this article, we will explore how to achieve this using ASP.NET Core WebAPI.

Prerequisites

Before we begin, make sure you have the following:

  • Visual or any other code editor
  • An Azure Blob Storage account
  • An ASP.NET Core WebAPI project set up

Downloading Bulk Files from Azure Blob Storage

To download multiple files from Azure Blob Storage, we need to perform the following steps:

Step 1: Install the Azure.Storage.Blobs NuGet package

First, we need to install the Azure.Storage.Blobs NuGet package. Open your project in Visual Studio and navigate to > NuGet Package Manager > Manage NuGet Packages for Solution. Search for “Azure.Storage.Blobs” and install the package.

Step 2: Configure Azure Blob Storage connection

Next, we need to configure the connection to our Azure Blob Storage account. Open the appsettings.json file in your project and add the following configuration:

{
  "AzureBlobStorage": {
    "ConnectionString": "your_connection_string",
    "ContainerName": "your_container_name"
  }
}

Replace your_connection_string with the connection string of your Azure Blob Storage account, and your_container_name with the name of the container where your files are stored.

Step 3: a FileController

Create a new controller FileController.cs in your project. This controller will the file download requests. Add the following code to the controller:

This code defines a DownloadFiles action that retrieves the connection string and container name from the configuration. It then creates a BlobServiceClient and a BlobContainerClient to interact with the Azure Blob Storage. The action loops through the list of file names and downloads each file from the storage. Finally, it creates a zip all the downloaded files and returns it as a file download.

Step 4: Test the API

Now that we have implemented the file download functionality, we can test it. Run your ASP.NET Core WebAPI project and make a GET request to /api/file/download. This will trigger the DownloadFiles action and initiate the download of the bulk files as a zip archive.

Conclusion

In this article, we have learned how to download bulk files from Azure Blob Storage using ASP.NET Core WebAPI. By following the steps outlined above, you can easily implement this functionality in your own web applications. Remember to configure the Azure Blob Storage connection and adjust the code according to your specific requirements.

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