FastQuant.GroupDispatcher.AddListener C# (CSharp) Method

        public void AddListener(IGroupListener listener)
        {
            lock (this)
            {
                this.listeners.Add(listener);
                this.groupIdsByListener[listener] = new List<int>();
                foreach(var group in this.framework.GroupManager.GroupList)
                    ProcessGroup(listener, group);
            }
        }