Adding/removing users to signalR groups in .NET 5.0

Question

The following code has been working in .netcoreapp3.1 but it stopped working after migrating the Http-triggered function to .NET 5.0:

public static class AddToGroup
    {
        [Function("addtogroup")]
        public static Task Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", Route = "addtogroup/{trnantId}/{userId}")]
            HttpRequestData req,
            string tenantId,
            string userId,
            [SignalR(HubName = "testhub")]
            IAsyncCollector<SignalRGroupAction> signalRGroupActions,
            FunctionContext executionContext)
        {
            return signalRGroupActions.AddAsync(new SignalRGroupAction
            {
                UserId = $"{tenantId}_{userId}",
                GroupName = tenantId,
                Action = GroupAction.Add
            });
        }
    }

Could anybody throw a guidance on an equivalent of this code in .NET 5.0?

Sure would be nice if 2 months later there was anything. This comment is made in solidarity of dealing with this genuinely fun time of trying to migrate to 5.0 while also using Azure. — Captain Prinny
– Captain Prinny, Commented May 24, 2021 at 13:40

sindo · Accepted Answer · 2021-03-31 05:02:14Z

1

As the error from compiler says: "...Attribute 'SignalROutput' is not valid on this declaration type. It is only valid on 'method, property, indexer' declarations....". You should put the [SignalR(HubName = "testhub")] attribute on the method. Here is a sample.

You can also see in the .Net 5 sample that the return type MyMessage has the same structure with the previous SignalRMessage in sample for .NET class library function apps.

edited Mar 31, 2021 at 5:02

answered Mar 29, 2021 at 9:13

sindo

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7 Comments

Arash Over a year ago

Putting the compile error aside, how users can be added to a signalR messaging group or how to remove a user from the group?

sindo Over a year ago

Previously you add a SignalRGroupAction to the IAsyncCollector, now you can just return the SignalRGroupAction from the method.

Arash Over a year ago

where is this point documented on Microsoft's documents website? @sindo

sindo Over a year ago

Docs: learn.microsoft.com/en-us/azure/azure-functions/…

Arash Over a year ago

none of those documents that you shared are talking about this topic neither clearly nor explicitly. Would you please show me the exact spot in those documents so that one can conclude your answer?

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