Azure SignalR Integration IAsyncCollector equivalent?

We use the SignalR integration with Azure Functions using the IAsyncCollector output binding

[FunctionName("SendMessage")]
public static Task SendMessage(
    [HttpTrigger(AuthorizationLevel.Anonymous, "post")]object message,
    [SignalR(HubName = "chat")]IAsyncCollector<SignalRMessage> signalRMessages)
{
    return signalRMessages.AddAsync(
        new SignalRMessage
        {
            // the message will only be sent to these user IDs
            UserId = "userId1",
            Target = "newMessage",
            Arguments = new [] { message }
        });
}

In attempting to migrate over I tried changing the AsyncCollector over to OutputBinding<SignalRMessage>, but using this only the last message added is actually sent. Is there a way to send multiple messages as the process is running?

[FunctionName("SendMessage")]
public static Task SendMessage(
    [HttpTrigger(AuthorizationLevel.Anonymous, "post")]object message,
    [SignalR(HubName = "chat")]OutputBinding<SignalRMessage> signalRMessages)
{
    return signalRMessages.AddAsync(
        new SignalRMessage
        {
            // the message will only be sent to these user IDs
            UserId = "userId1",
            Target = "newMessage",
            Arguments = new [] { message }
        });
}

[fabiocav]

@anthonychu I think this is actually about two different things (@sccrgoalie1 , please correct me if I’m wrong), both about the cardinality (sending multiple messages) and the real time behavior of the async collector provided by the SignalR extension. The latter will not be addressed by GA (messages will only be sent when the function returns)

[anthonychu]

You should be able to use OutputBinding<IEnumerable< SignalRMessage >> but this is not working in preview3. Tracking this here: https://github.com/Azure/azure-functions-dotnet-worker/issues/124