How do you send multiple messages with the Azure SignalR Service output binding?

Figured it out! Create a new POCO and move the output binding from the function to the new return type.

    [Function(nameof(MyFunction))]
    public async Task<SignalRMessages> MyFunction([HttpTrigger(AuthorizationLevel.Anonymous, "post")] HttpRequestData req)
    {
        HttpResponseData response = req.CreateResponse(HttpStatusCode.Accepted);
        SignalRMessageAction[] messages = [
                new SignalRMessageAction(hubActionName, ["TEST1", "TEST1"]),
                new SignalRMessageAction(hubActionName, ["TEST2", "TEST2"])
                ];
        return await Task.FromResult(new SignalRMessages(messages));
    }
    public class SignalRMessages(IEnumerable<SignalRMessageAction> messages)
    {
        [SignalROutput(HubName = hubName, ConnectionStringSetting = appSettingSignalR)]
        public IEnumerable<SignalRMessageAction> Messages { get; set; } = messages;
    }

More detailed answer in this SO answer.

https://stackoverflow.com/a/79281253/7512742

Following-up from the comments, to benefit the community sharing the answer posted by Adam Vincent.

Question/Issue: How do you send multiple messages with the Azure SignalR Service output binding?

Azure doc ref:

Use the SignalR output binding to send one or more messages using Azure SignalR Service.

Copying the solution shared by Adam Vincent (Thank you!)

Answer/solution:

Create a new POCO and move the output binding from the function to the new return type.

[Function(nameof(MyFunction))]
    public async Task<SignalRMessages> MyFunction([HttpTrigger(AuthorizationLevel.Anonymous, "post")] HttpRequestData req)
    {
        HttpResponseData response = req.CreateResponse(HttpStatusCode.Accepted);
        SignalRMessageAction[] messages = [
                new SignalRMessageAction(hubActionName, ["TEST1", "TEST1"]),
                new SignalRMessageAction(hubActionName, ["TEST2", "TEST2"])
                ];
        return await Task.FromResult(new SignalRMessages(messages));
    }
    public class SignalRMessages(IEnumerable<SignalRMessageAction> messages)
    {
        [SignalROutput(HubName = hubName, ConnectionStringSetting = appSettingSignalR)]
        public IEnumerable<SignalRMessageAction> Messages { get; set; } = messages;
    }

Linking Adam's SO post with a detailed answer ( with examples and different methods).

Please click Accept Answer - it will benefit the community/users to find the answer quickly.