SignalR - Checking if a user is still connected

Question

I have a hub with method that is called client-side. This method launches a timer with a delegate that runs every 10 seconds. Since it wouldn\'t make sense to keep running t

Answer 1

Probably the most used solution is to keep a static variable containing users currently connected and overriding OnConnect and OnDisconnect or implementing IDisconnect depending on the version that you use.

You would implement something like this:

public class MyHub : Hub
{
    private static List users = new List();
    public override Task OnConnected()
    {
        users.Add(Context.ConnectionId);
        return base.OnConnected();
    }

    //SignalR Verions 1 Signature
    public override Task OnDisconnected()
    {
        users.Remove(Context.ConnectionId);
        return base.OnDisconnected();
    }

    //SignalR Version 2 Signature
    public override Task OnDisconnected(bool stopCalled)
    {
        users.Remove(Context.ConnectionId);
        return base.OnDisconnected(stopCalled);
    }

    // In your delegate check the count of users in your list.
}