if (DesignHelpers.IsDesignTime) return;

private static void SubscribeItems() { DateTime now = DateTime.Now; ExceptionHandler.LogException(new Exception("Start Subscribe Alarms OPC " + DateTime.Now.ToString())); List<DAReadItemArguments> ListReadItemsArguments = new List<DAReadItemArguments>(); //subscribe all the alarms to the OPC server foreach (Alarm AlarmItem in ListOfAlarms) { ListReadItemsArguments.Add(new DAReadItemArguments(AlarmItem.OPCDescriptor.MachineName, AlarmItem.OPCDescriptor.ServerName, AlarmItem.OPCDescriptor.OPCItem, 0)); } DAVtqResult[] _DAVtq; _DAVtq = new DAVtqResult[ListReadItemsArguments.Count]; _DAVtq = OPCClient.ReadMultipleItems(ListReadItemsArguments.ToArray()); //This Read works correctly ///////////////////// ExceptionHandler.LogException(new Exception("Read Alarms OPC " + (DateTime.Now - now).ToString())); int i = 0; foreach (Alarm AlarmItem in ListOfAlarms) { if (_DAVtq[i] != null && _DAVtq[i].Succeeded && _DAVtq[i].Vtq != null) { if (_DAVtq[i].Vtq.Value != null) { AlarmItem.State = (Alarm.AlarmState)(Convert.ToInt16(_DAVtq[i].Vtq.Value)); } else { AlarmItem.State = Alarm.AlarmState.Inactive; } } i++; } ExceptionHandler.LogException(new Exception("fire Alarms OPC event 1st time " + (DateTime.Now - now).ToString())); // raise the AlarmEvent: OnGlobalAlarmsEvent(null, new AlarmSignalEventArgs(ListOfAlarms)); OPCClient.UnsubscribeAllItems(); ExceptionHandler.LogException(new Exception("Subscribe OPC Alarms " + (DateTime.Now - now).ToString())); //subscribe all the alarms to the OPC server foreach (Alarm AlarmItem in ListOfAlarms) { int SubscriptionID = OPCClient.SubscribeItem(AlarmItem.OPCDescriptor.MachineName, AlarmItem.OPCDescriptor.ServerName, AlarmItem.OPCDescriptor.OPCItem, 50, null); //copy the subscription ID, to know later which alarm fired the OPC event AlarmItem.OPCDescriptor.SubscriptionID = SubscriptionID; } OPCClient.MultipleItemsChanged += new EventHandler<EasyDAMultipleItemsChangedEventArgs>(OPCClient_MultipleItemsChanged); ExceptionHandler.LogException(new Exception("END OPC Alarms " + ( DateTime.Now - now ).ToString())); } } /// <summary> /// Handles the event that occurs if at least one OPC Alarm variable changed its state (from true to false or vice versa) /// </summary> /// <param name="sender"></param> /// <param name="e"></param> private static void OPCClient_MultipleItemsChanged(object sender, EasyDAMultipleItemsChangedEventArgs e) { if (DesignHelpers.IsDesignTime) return; lock (ListOfAlarms) { foreach (Alarm AlarmItem in ListOfAlarms) { //bool changed = false; //Search for all the arguments given in the opc event, which are actives and look for the alarm that fired that event foreach (EasyDAItemChangedEventArgs TempEventArg in e.ArgsArray) { // if the Subscription ID was found, and the Argument is value then set the status of the alarm if ((AlarmItem.OPCDescriptor.SubscriptionID == TempEventArg.Handle) && (TempEventArg.Vtq != null)) { Alarm.AlarmState TempValue = (Alarm.AlarmState)(Convert.ToInt16(TempEventArg.Vtq.Value)); } } } } // raise the AlarmEvent: OnGlobalAlarmsEvent(null, new AlarmSignalEventArgs(ListOfAlarms)); ////////This event is not fired }