FSClient.Call.live_call_count C# (CSharp) Méthode

        public static int live_call_count()
        {
            return (from c in calls where c.call_ended == false select c).Count();
        }

        private void UpdateStatus()
        {
            int  cur_active_calls       = Call.live_call_count();
            bool is_call_active         = (Call.active_call != null);
            bool devices_ready          = cur_active_calls > 0;
            bool is_call_answered       = (from c in Call.calls where c.state == Call.CALL_STATE.Answered || (c.state == Call.CALL_STATE.Ringing && c.is_outgoing) select true).Count() > 0;
            bool is_active_call_ringing = Call.active_call != null && Call.active_call.is_outgoing == false && Call.active_call.state == Call.CALL_STATE.Ringing;

            bool actually_set_active_calls        = active_calls != cur_active_calls;
            bool actually_set_call_active         = call_active != is_call_active;
            bool actually_set_CanEnd              = actually_set_call_active;
            bool actually_set_DevicesReady        = DevicesReady != devices_ready;
            bool actually_set_active_call_ringing = active_call_ringing != is_active_call_ringing;
            bool actually_set_call_answered       = call_answered != is_call_answered;

            if (actually_set_active_calls)
            {
                _active_calls = cur_active_calls;
            }
            if (actually_set_call_active)
            {
                _call_active = is_call_active;
            }
            if (actually_set_CanEnd)
            {
                _CanEnd = is_call_active;
            }
            if (actually_set_DevicesReady)
            {
                _DevicesReady = devices_ready;
            }
            if (actually_set_active_call_ringing)
            {
                _active_call_ringing = is_active_call_ringing;
            }
            if (actually_set_call_answered)
            {
                _call_answered = is_call_answered;
            }


            if (actually_set_active_calls && active_callsChanged != null)
            {
                active_callsChanged(this, cur_active_calls);
            }
            if (actually_set_call_active && call_activeChanged != null)
            {
                call_activeChanged(this, is_call_active);
            }
            if (actually_set_CanEnd && CanEndChanged != null)
            {
                CanEndChanged(this, CanEnd);
            }
            if (actually_set_DevicesReady && DevicesReadyChanged != null)
            {
                DevicesReadyChanged(this, devices_ready);
            }
            if (actually_set_active_call_ringing && active_call_ringingChanged != null)
            {
                active_call_ringingChanged(this, is_active_call_ringing);
            }
            if (actually_set_call_answered && call_answeredChanged != null)
            {
                call_answeredChanged(this, is_call_answered);
            }
        }