Opc.Ua.ContentFilter.Between C# (CSharp) Method

        private bool? Between(FilterContext context, IFilterTarget target, ContentFilterElement element)
        {
            FilterOperand[] operands = GetOperands(element, 3);

            object value = GetValue(context, operands[0], target);

            object min = GetValue(context, operands[1], target);
            object max = GetValue(context, operands[2], target);
            
            // the min and max could be different data types so the implicit conversion must be done twice.
            object lhs = value;
            DoImplicitConversion(ref lhs, ref min);

            bool? result = null;
            
            if (lhs is IComparable && min is IComparable)
            {
                // check if never in range no matter what happens with the upper bound.
                if (((IComparable)lhs).CompareTo(min) < 0)
                {
                    return false;
                }

                result = true;
            }
            
            lhs = value;
            DoImplicitConversion(ref lhs, ref max);
            
            if (lhs is IComparable && max is IComparable)
            {
                // check if never in range no matter what happens with the lower bound.
                if (((IComparable)lhs).CompareTo(max) > 0)
                {
                    return false;
                }

                // can't determine if in range if lower bound could not be resolved.
                return result != null;
            }
            
            // return null if the types are not comparable.
            return null;
        }