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.NET Aspire Azure Blob Storage component

  • Article

In this article, you learn how to use the .NET Aspire Azure Blob Storage component. The Aspire.Azure.Storage.Blobs library is used to register a BlobServiceClient in the DI container for connecting to Azure Blob Storage. It also enables corresponding health checks, logging and telemetry.

Get started

To get started with the .NET Aspire Azure Blob Storage component, install the Aspire.Azure.Storage.Blobs NuGet package.

dotnet add package Aspire.Azure.Storage.Blobs

For more information, see dotnet add package or Manage package dependencies in .NET applications.

Example usage

In the Program.cs file of your component-consuming project, call the AddAzureBlobClient extension to register a BlobServiceClient for use via the dependency injection container.

builder.AddAzureBlobClient("blobs");

You can then retrieve the BlobServiceClient instance using dependency injection. For example, to retrieve the client from a service:

public class ExampleService(BlobServiceClient client)
{
    // Use client...
}

App host usage

To add Azure Storage hosting support to your IDistributedApplicationBuilder, install the Aspire.Hosting.Azure.Storage NuGet package.

dotnet add package Aspire.Hosting.Azure.Storage

In your app host project, register the Azure Blob Storage component and consume the service using the following methods, such as AddAzureStorage:

var builder = DistributedApplication.CreateBuilder(args);

var blobs = builder.AddAzureStorage("storage")
                   .AddBlobs("blobs");

var exampleProject = builder.AddProject<Projects.ExampleProject>()
                            .WithReference(blobs);

The AddBlobs method will read connection information from the AppHost's configuration (for example, from "user secrets") under the ConnectionStrings:blobs config key. The WithReference method passes that connection information into a connection string named blobs in the ExampleProject project. In the Program.cs file of ExampleProject, the connection can be consumed using:

builder.AddAzureBlobClient("blobs");

Configuration

The .NET Aspire Azure Blob Storage component provides multiple options to configure the BlobServiceClient based on the requirements and conventions of your project.

Use a connection string

When using a connection string from the ConnectionStrings configuration section, you can provide the name of the connection string when calling builder.AddAzureBlobClient:

builder.AddAzureBlobClient("blobs");

And then the connection string will be retrieved from the ConnectionStrings configuration section. Two connection formats are supported:

Service URI

The recommended approach is to use a ServiceUri, which works with the AzureStorageBlobsSettings.Credential property to establish a connection. If no credential is configured, the Azure.Identity.DefaultAzureCredential is used.

{
  "ConnectionStrings": {
    "blobsConnectionName": "https://{account_name}.blob.core.windows.net/"
  }
}

Connection string

Alternatively, an Azure Storage connection string can be used.

{
  "ConnectionStrings": {
    "blobsConnectionName": "AccountName=myaccount;AccountKey=myaccountkey"
  }
}

Use configuration providers

The .NET Aspire Azure Blob Storage component supports Microsoft.Extensions.Configuration. It loads the AzureStorageBlobsSettings and BlobClientOptions from configuration by using the Aspire:Azure:Storage:Blobs key. Example appsettings.json that configures some of the options:

{
  "Aspire": {
    "Azure": {
      "Storage": {
        "Blobs": {
          "DisableHealthChecks": true,
          "DisableTracing": false,
          "ClientOptions": {
            "Diagnostics": {
              "ApplicationId": "myapp"
            }
          }
        }
      }
    }
  }
}

Use inline delegates

You can also pass the Action<AzureStorageBlobsSettings> configureSettings delegate to set up some or all the options inline, for example to configure health checks:

builder.AddAzureBlobClient(
    "blobs",
    static settings => settings.DisableHealthChecks  = true);

You can also set up the BlobClientOptions using Action<IAzureClientBuilder<BlobServiceClient, BlobClientOptions>> configureClientBuilder delegate, the second parameter of the AddAzureBlobClient method. For example, to set the first part of user-agent headers for all requests issues by this client:

builder.AddAzureBlobClient(
    "blobs",
    static configureClientBuilder: clientBuilder =>
        clientBuilder.ConfigureOptions(
            static options => options.Diagnostics.ApplicationId = "myapp"));

Health checks

By default, .NET Aspire components enable health checks for all services. For more information, see .NET Aspire components overview.

The .NET Aspire Azure Blob Storage component handles the following:

  • Adds the AzureBlobStorageHealthCheck health check, which attempts to connect to and query blob storage
  • Integrates with the /health HTTP endpoint, which specifies all registered health checks must pass for app to be considered ready to accept traffic

Observability and telemetry

.NET Aspire components automatically set up Logging, Tracing, and Metrics configurations, which are sometimes known as the pillars of observability. For more information about component observability and telemetry, see .NET Aspire components overview. Depending on the backing service, some components may only support some of these features. For example, some components support logging and tracing, but not metrics. Telemetry features can also be disabled using the techniques presented in the Configuration section.

Logging

The .NET Aspire Azure Blob Storage component uses the following log categories:

  • Azure.Core
  • Azure.Identity

Tracing

The .NET Aspire Azure Blob Storage component will emit the following tracing activities using OpenTelemetry:

  • "Azure.Storage.Blobs.BlobContainerClient"

Metrics

The .NET Aspire Azure Blob Storage component currently does not support metrics by default due to limitations with the Azure SDK.

See also