Mapping SignalR Users to Connections in Groups

Question

How can I add/remove a user from a group using the userId

Groups.Add(userid,"groupName")

that I use in my database instead of using connectionId

Groups.Add(connectionId,"groupName")

I created a mapping like here ! using the User ID Provider method and I am able to do this

Clients.Users(userId).sendMessage("asa")

but

Groups.Add(userid,"groupName")

it is not working. So how can I make work? 工作？ Is there a special mapping that I don't know about or I am using this one wrong?

Answer 1

It is not possible to add userId to group. You should only use connectionId . Depending of your needs you can use one another of the approaches described in the link you provided .

For example, you can add each connection to the group named by userId :

Groups.Add(Context.ConnectionId, userId);

And then you can send messages to the specified user:

Clients.Group(userId).sendMessage("asa");

Another use case may include determining userId in OnConnected method and then adding the user to needed group by its connectionId :

var groupName = GetGroupNameByUserId(userId);
Groups.Add(Context.ConnectionId, groupName);
...
Clients.Group(groupName).sendMessage("asa");