Opc.Ua.Server.StatusAggregateCalculator.ComputeDurationGoodBad C# (CSharp) Method

        protected DataValue ComputeDurationGoodBad(TimeSlice slice, bool isBad, bool usePercent)
        {
            // get the values in the slice.
            List<DataValue> values = GetValuesWithSimpleBounds(slice);

            // check for empty slice.
            if (values == null || values.Count == 0)
            {
                return GetNoDataValue(slice);
            }

            // get the regions.
            List<SubRegion> regions = GetRegionsInValueSet(values, false, true);

            double duration = 0;
            double total = 0;

            for (int ii = 0; ii < regions.Count; ii++)
            {
                total += regions[ii].Duration;

                if (isBad)
                {
                    if (StatusCode.IsBad(regions[ii].StatusCode))
                    {
                        duration += regions[ii].Duration;
                    }
                }
                else
                {
                    if (StatusCode.IsGood(regions[ii].StatusCode))
                    {
                        duration += regions[ii].Duration;
                    }
                }
            }

            if (usePercent)
            {
                duration = (duration / total) * 100;
            }

            // set the timestamp and status.
            DataValue value = new DataValue();
            value.WrappedValue = new Variant(duration, TypeInfo.Scalars.Double);
            value.SourceTimestamp = GetTimestamp(slice);
            value.ServerTimestamp = GetTimestamp(slice);            
            value.StatusCode = value.StatusCode.SetAggregateBits(AggregateBits.Calculated);

            // return result.
            return value;
        }