# Azure Storage Queues Native Integration

<!-- Version variant: asqn_9; default: [/transports/azure-storage-queues/native-integration.md](/transports/azure-storage-queues/native-integration.md) -->



This document describes how to consume messages from and send messages to non-NServiceBus endpoints via Azure Storage Queues in integration scenarios.

### Sending native messages

Sending native messages can be accomplished by sending a message with a JSON-serialized payload using the `QueueClient`.
Refer to the [sample](/samples/azure/native-integration-asq/index.md) for more information.

### Custom envelope unwrapper

Azure Storage Queues lacks native header support. NServiceBus solves this by wrapping headers and message body in a custom envelope structure. This envelope is serialized using the configured [serializer](/nservicebus/serialization/index.md) for the endpoint before being sent.

Creating this envelope can cause unnecessary complexity if headers are not needed, as is the case in native integration scenarios. For this reason, NServiceBus.Transport.AzureStorageQueues 9.0 and above support configuring a custom envelope unwrapper. 

> [!WARNING]
> In this scenario, NServiceBus may place messages in your queue in addition to the native messages that are expected, for example if a message results in a [delayed retry](delayed-delivery.md). Any custom envelope unwrapper must verify if the incoming message is capable of being deserialized as a native message, and the resulting body must be serialized according to the configured endpoint serializer.

The snippet below shows custom unwrapping logic that enables both NServiceBus formatted and plain serialized messages to be consumed.

<!-- snippet: CustomEnvelopeUnwrapper -->

```cs
var transport = endpointConfiguration.UseTransport<AzureStorageQueueTransport>();

transport.UnwrapMessagesWith(queueMessage =>
{
    using (var stream = new MemoryStream(Convert.FromBase64String(queueMessage.MessageText)))
    using (var streamReader = new StreamReader(stream))
    using (var textReader = new JsonTextReader(streamReader))
    {
        //try deserialize to a NServiceBus envelope first
        var wrapper = jsonSerializer.Deserialize<MessageWrapper>(textReader);

        if (wrapper.Id != null)
        {
            //this was a envelope message
            return wrapper;
        }

        //this was a native message just return the body as is with no headers
        return new MessageWrapper
        {
            Id = queueMessage.MessageId,
            Headers = new Dictionary<string, string>(),
            Body = Convert.FromBase64String(queueMessage.MessageText)
        };
    }
});
```

<!-- endsnippet -->

> [!NOTE]
> This feature is currently NOT compatible with ServiceControl. A [ServiceControl transport adapter](/servicecontrol/transport-adapter.md) is required to leverage both.