Opc.Ua.ContentFilter.Not C# (CSharp) Method

        private bool? Not(FilterContext context, IFilterTarget target, ContentFilterElement element)
        {
            FilterOperand[] operands = GetOperands(element, 1);

            bool? rhs = GetValue(context, operands[0], target) as bool?;
            
            if (rhs == null)
            {
                return null;
            }
            
            return !rhs.Value;
        }