public static void StartInspect(InspectRHub hub, string uniquekey)
{
var connectionId = hub.Context.ConnectionId;
hub.Groups.Add(connectionId, uniquekey);
_groups.AddOrUpdate(connectionId, new[] { uniquekey },
(key, current) => current.Concat(new[] { uniquekey }).ToArray());
}
public static void OnDisconnected(InspectRHub hub)
{
string[] val;
_groups.TryRemove(hub.Context.ConnectionId, out val);
}