NLog.Targets.FileTarget.FindDateAndSequenceArchives C# (CSharp) Method

        private IEnumerable<DateAndSequenceArchive> FindDateAndSequenceArchives(string dirName, string logFileName,
            string fileNameMask,
            int minSequenceLength, string dateFormat, FileNameTemplate fileTemplate)
        {
            var directoryInfo = new DirectoryInfo(dirName);

            int archiveFileNameMinLength = fileNameMask.Length + minSequenceLength;
            var archiveFileNames = GetFiles(directoryInfo, fileNameMask)
                .Where(n => n.Name.Length >= archiveFileNameMinLength)
                .OrderBy(n => n.CreationTime)
                .Select(n => n.FullName);

            foreach (string archiveFileName in archiveFileNames)
            {
                //Get the archive file name or empty string if it's null
                string archiveFileNameWithoutPath = Path.GetFileName(archiveFileName) ?? "";

                DateTime date;
                int sequence;
                if (
                    !TryParseDateAndSequence(archiveFileNameWithoutPath, dateFormat, fileTemplate, out date,
                        out sequence))
                {
                    continue;
                }

                //It's possible that the log file itself has a name that will match the archive file mask.
                if (string.IsNullOrEmpty(archiveFileNameWithoutPath) ||
                    archiveFileNameWithoutPath.Equals(Path.GetFileName(logFileName)))
                {
                    continue;
                }

                yield return new DateAndSequenceArchive(archiveFileName, date, dateFormat, sequence);
            }
        }