Opc.Ua.Server.CoreNodeManager.SubscribeToEvents C# (CSharp) Method

        public ServiceResult SubscribeToEvents(
            OperationContext    context,
            object              sourceId,
            uint                subscriptionId,
            IEventMonitoredItem monitoredItem,
            bool                unsubscribe)
        {
            if (context == null)  throw new ArgumentNullException("context");
            if (sourceId == null) throw new ArgumentNullException("sourceId");
            if (monitoredItem == null) throw new ArgumentNullException("monitoredItem");

            try
            {
                m_lock.Enter();

                // validate the node.
                NodeMetadata metadata = GetNodeMetadata(context, sourceId, BrowseResultMask.NodeClass);

                if (metadata == null)
                {
                    return StatusCodes.BadNodeIdUnknown;
                }

                // validate the node class.
                if (((metadata.NodeClass & NodeClass.Object | NodeClass.View)) == 0)
                {
                    return StatusCodes.BadNotSupported;
                }

                // check that it supports events.
                if ((metadata.EventNotifier & EventNotifiers.SubscribeToEvents) == 0)
                {
                    return StatusCodes.BadNotSupported;
                }
                
                #if LEGACY_CORENODEMANAGER  
                // subscribe to all notifiers below the notifier.
                SubscribeToEvents(
                    context, 
                    metadata.Handle as ILocalNode, 
                    subscriptionId, 
                    monitoredItem, 
                    unsubscribe);
                #endif
                
                return ServiceResult.Good;
            }
            finally
            {
                m_lock.Exit();
            }
        }