Azure blob storage download to stream returning asp net

Introduction

ASP.NET is a popular programming used for web applications. One common requirement in web development is to download files from Azure Blob Storage and them as a stream in ASP.NET. In this article, we will explore how to achieve this using ASP.NET.

Prerequisites

Before we , make sure you have the following prerequisites:

  • An Azure Blob Storage
  • An ASP.NET project set up

Downloading Azure Blob Storage to Stream

To download a file from Azure Blob Storage and return it as a stream in ASP.NET, we need to perform the following steps:

Step 1: Install Azure Storage SDK

First, we need to install the Azure Storage SDK in our ASP.NET project. Open the Package Console and run the following command:

Install-Package WindowsAzure.Storage

Step 2: Retrieve Blob from Azure Blob Storage

Next, we need to retrieve the blob from Azure Blob Storage. We can do this by creating an instance of the CloudBlobContainer class and the GetBlobReference method with the blob name:

CloudStorageAccount storageAccount = CloudStorageAccount.Parse("connectionString");
CloudBlobClient blobClient = storageAccount.CreateCloudBlobClient();
CloudBlobContainer container = blobClient.GetContainerReference("containerName");
CloudBlockBlob blob = container.GetBlockBlobReference("blobName");

Step 3: Download Blob to Stream

Now that we have the blob reference, we can download it to a stream. We can use the OpenReadAsync method to open a stream to the blob and read its :

Stream stream = await blob.OpenReadAsync();

Step 4: Return Stream as Response

Finally, we can return the stream as the response in ASP.NET. We can use the File method to return the stream with the appropriate type and file name:

return File(stream, "application/octet-stream", "fileName");

Conclusion

In this article, we have learned how to download a file from Azure Blob Storage and return it as a stream in ASP.NET. By following the steps outlined above, you can easily implement this functionality in your ASP.NET projects. Remember to install the Azure Storage SDK, retrieve the blob from Azure Blob Storage, download it to a stream, and return the stream as the response. Happy coding!

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