ArchiveComparer2.Library.ArchiveDuplicateDetector.BuildDuplicateList C# (CSharp) Method

        private List<DuplicateArchiveInfoList> BuildDuplicateList(List<DuplicateArchiveInfo> list, DuplicateSearchOption option)
        {
            NotifyCaller("Start building duplicate list.", OperationStatus.BUILDING_DUPLICATE_LIST);

            List<DuplicateArchiveInfoList> dupList = new List<DuplicateArchiveInfoList>();

            list.Sort(new DuplicateArchiveInfoItemCountComparer());

            int totalCount = list.Count;
            int i = 0;
            while (list.Count > 0)
            {
                _pauseEvent.WaitOne(Timeout.Infinite);
                if (_shutdownEvent.WaitOne(0))
                {
                    NotifyCaller("Stopping...", OperationStatus.BUILDING_DUPLICATE_LIST);
                    break;
                }

                ++i;
                DuplicateArchiveInfoList dup = new DuplicateArchiveInfoList();
                DuplicateArchiveInfo temp = list[0];
                list.RemoveAt(0);
                dup.Original = temp;

                string message = "Checking: " + temp.Filename + " ( Duplicate group found: " + i + " File to check left: " + list.Count + ")";
                NotifyCaller(message, OperationStatus.BUILDING_DUPLICATE_LIST, curr:i, total:totalCount);

                // check for other possible dups.
                int index = 0;
                while (list.Count > index)
                {
                    DuplicateArchiveInfo curr = list[index];

                    if (Compare(ref temp, ref curr, option))
                    {
                        if (dup.Duplicates == null) dup.Duplicates = new List<DuplicateArchiveInfo>();
                        dup.Duplicates.Add(curr);
                        // remove from the source list.
                        list.Remove(curr);
                        --totalCount;
                    }
                    else
                    {
                        ++index;
                    }
                }

                dupList.Add(dup);
            }

            foreach (DuplicateArchiveInfoList dup in dupList)
            {
                if (dup.Duplicates != null)
                {
                    dup.Duplicates.Sort(new DuplicateArchiveInfoPercentageComparer());
                }
            }
            NotifyCaller("Building Duplicate List Complete.", OperationStatus.BUILDING_DUPLICATE_LIST);

            return dupList;
        }