Can I call Groups.Add on the same connectionid but for 2 different groups and if i broadcast a certain message to either group the connectionid added will get both messages?
Can I call Groups.Add on the same connectionid but for 2 different groups and
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Yes. This is exactly what JabbR, the flagship test application for SignalR, does. It uses groups to represent “rooms” and, in JabbR, a user can be in N rooms. You can see the exact details of that implementation here.