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

        private bool InView(FilterContext context, IFilterTarget target, ContentFilterElement element)
        {
            // views only supported in advanced filter targets.
            IAdvancedFilterTarget advancedFilter = target as IAdvancedFilterTarget;

            if (advancedFilter == null)
            {
                return false;
            }

            FilterOperand[] operands = GetOperands(element, 1);
            
            // get the desired type.
            NodeId viewId = GetValue(context, operands[0], target) as NodeId;

            if (viewId == null || target == null)
            {
                return false;
            }

            // check the target.
            try
            {
                return advancedFilter.IsInView(context, viewId);
            }
            catch
            {
                return false;
            }
        }