Opc.Ua.Server.CustomNodeManager2.SubscribeToEvents C# (CSharp) Method

        public virtual ServiceResult SubscribeToEvents(
            OperationContext    context, 
            object              sourceId, 
            uint                subscriptionId, 
            IEventMonitoredItem monitoredItem, 
            bool                unsubscribe)
        {
            ServerSystemContext systemContext = SystemContext.Copy(context);

            lock (Lock)
            {
                // check for valid handle.
                NodeHandle handle = IsHandleInNamespace(sourceId);

                if (handle == null)
                {
                    return StatusCodes.BadNodeIdInvalid;
                }

                // check for valid node.
                NodeState source = ValidateNode(systemContext, handle, null);

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

                // subscribe to events.
                return SubscribeToEvents(systemContext, source, monitoredItem, unsubscribe);
            }
        }