Opc.Ua.ViewState.WriteNonValueAttribute C# (CSharp) Method

        protected override ServiceResult WriteNonValueAttribute(
            ISystemContext context,
            uint attributeId,
            object value)
        {
            ServiceResult result = null;

            switch (attributeId)
            {
                case Attributes.EventNotifier:
                {
                    byte? eventNotifierRef = value as byte?;

                    if (eventNotifierRef == null)
                    {
                        return StatusCodes.BadTypeMismatch;
                    }

                    if ((WriteMask & AttributeWriteMask.EventNotifier) == 0)
                    {
                        return StatusCodes.BadNotWritable;
                    }

                    byte eventNotifier = eventNotifierRef.Value;

                    if (OnWriteEventNotifier != null)
                    {
                        result = OnWriteEventNotifier(context, this, ref eventNotifier);
                    }

                    if (ServiceResult.IsGood(result))
                    {
                        EventNotifier = eventNotifier;
                    }

                    return result;
                }

                case Attributes.ContainsNoLoops:
                {
                    bool? containsNoLoopsRef = value as bool?;

                    if (containsNoLoopsRef == null)
                    {
                        return StatusCodes.BadTypeMismatch;
                    }

                    if ((WriteMask & AttributeWriteMask.ContainsNoLoops) == 0)
                    {
                        return StatusCodes.BadNotWritable;
                    }

                    bool containsNoLoops = containsNoLoopsRef.Value;

                    if (OnWriteContainsNoLoops != null)
                    {
                        result = OnWriteContainsNoLoops(context, this, ref containsNoLoops);
                    }

                    if (ServiceResult.IsGood(result))
                    {
                        ContainsNoLoops = containsNoLoops;
                    }

                    return result;
                }              
            }

            return base.WriteNonValueAttribute(context, attributeId, value);
        }
        #endregion