Late Bind to Queue in Azure Function using IBinder

Question

The Azure Function dotnet class library docs detail how to use an IBinder to connect to any storage endpoint.

How to late bind to a Queue?

The example given shows binding to a Blob container as a TextWriter.

[FunctionName("CreateBlobUsingBinder")]
public static void Run(
    [QueueTrigger("myqueue-items-source-4")] string myQueueItem,
    IBinder binder,
    ILogger log)
{
    log.LogInformation($"CreateBlobUsingBinder function processed: {myQueueItem}");
    using (var writer = binder.Bind<TextWriter>(new BlobAttribute(
                $"samples-output/{myQueueItem}", FileAccess.Write)))
    {
        writer.Write("Hello World!");
    };
}

In the 'Attribute' syntax it would be:

[QueueTrigger("inputQ")] InputDTO inputobject,
[Queue("output{clientid}Q")] OutputDTO outputobject,
IBinder binder{
...
}

but in my situation 'clientid' is not known until after binding occours.

Answer 1

Solution is to use an ICollector<T> .

var clientid = inputclientid;
var practiceMessageQueue = await binder.BindAsync<ICollector<OutputDTO>>(
    new QueueAttribute($"output{clientid}Q")).ConfigureAwait(false);