public async Task JoinSession(string sessionId)
{
if (null == sessionId)
{
throw new ArgumentNullException("sessionId");
}
// TODO: call the service to make sure we have permissions
await Groups.Add(Context.ConnectionId, sessionId);
var connectionId = Context.ConnectionId;
var userName = Context.User?.Identity?.Name ?? "Anonymous";
_services.AddClient(new Client {
ConnectionId = connectionId, Name = userName, SessionId = sessionId
});
}