How to Upload Files to Azure Blob Storage using Azure.Storage.Blobs in ASP.NET Core?

Azure Blob Storage offers scalable object storage for unstructured data such as image files, documents, and media streams. In ASP.NET Core, managing uploads is made straightforward through the official SDK.

Registering BlobServiceClient

In Program.cs, register the BlobServiceClient as a service using dependency injection:

using Azure.Storage.Blobs;

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddSingleton(x =>
    new BlobServiceClient(builder.Configuration.GetConnectionString("AzureBlobStorage"))
);

var app = builder.Build();

Implementing the File Upload Service

Inject BlobServiceClient into your service or API controller to upload files directly to a designated Blob container:

public class StorageService
{
    private readonly BlobServiceClient _blobServiceClient;

    public StorageService(BlobServiceClient blobServiceClient)
    {
        _blobServiceClient = blobServiceClient;
    }

    public async Task<string> UploadFileAsync(string containerName, IFormFile file)
    {
        var containerClient = _blobServiceClient.GetBlobContainerClient(containerName);
        await containerClient.CreateIfNotExistsAsync();

        var blobClient = containerClient.GetBlobClient(file.FileName);
        using var stream = file.OpenReadStream();
        await blobClient.UploadAsync(stream, overwrite: true);

        return blobClient.Uri.ToString();
    }
}