private static string GetAttachmentByUrlCompName(MailboxSession mailboxSession, string attachmentId, Stream outStream, int offset, int count, Unlimited <ByteQuantifiedSize> maxAttachmentSize, out int total)
        {
            attachmentId = "/" + attachmentId;
            int    andCheckLastSlashLocation = AttachmentHelper.GetAndCheckLastSlashLocation(attachmentId, attachmentId);
            string text  = attachmentId.Substring(0, andCheckLastSlashLocation);
            string text2 = attachmentId.Substring(andCheckLastSlashLocation + 1);

            andCheckLastSlashLocation = AttachmentHelper.GetAndCheckLastSlashLocation(text, attachmentId);
            string      propertyValue = text.Substring(0, andCheckLastSlashLocation);
            StoreId     storeId       = null;
            QueryFilter seekFilter    = new ComparisonFilter(ComparisonOperator.Equal, FolderSchema.UrlName, propertyValue);

            using (Folder folder = Folder.Bind(mailboxSession, mailboxSession.GetDefaultFolderId(DefaultFolderType.Root)))
            {
                using (QueryResult queryResult = folder.FolderQuery(FolderQueryFlags.DeepTraversal, AirSyncUtility.XsoFilters.GetHierarchyFilter, null, AttachmentHelper.folderPropertyIds))
                {
                    if (queryResult.SeekToCondition(SeekReference.OriginBeginning, seekFilter))
                    {
                        object[][] rows = queryResult.GetRows(1);
                        storeId = (rows[0][0] as StoreId);
                    }
                }
            }
            if (storeId == null)
            {
                throw new ObjectNotFoundException(ServerStrings.MapiCannotOpenAttachmentId(attachmentId));
            }
            AirSyncDiagnostics.TraceDebug <StoreId>(ExTraceGlobals.RequestsTracer, null, "Getting attachment with parentStoreId {0}.", storeId);
            StoreId storeId2 = null;

            seekFilter = new ComparisonFilter(ComparisonOperator.Equal, FolderSchema.UrlName, text);
            using (Folder folder2 = Folder.Bind(mailboxSession, storeId))
            {
                using (QueryResult queryResult2 = folder2.ItemQuery(ItemQueryType.None, null, null, AttachmentHelper.itemPropertyIds))
                {
                    if (queryResult2.SeekToCondition(SeekReference.OriginBeginning, seekFilter))
                    {
                        object[][] rows2 = queryResult2.GetRows(1);
                        storeId2 = (rows2[0][0] as StoreId);
                    }
                }
            }
            if (storeId2 == null)
            {
                throw new ObjectNotFoundException(ServerStrings.MapiCannotOpenAttachmentId(attachmentId));
            }
            AirSyncDiagnostics.TraceDebug <StoreId>(ExTraceGlobals.RequestsTracer, null, "Getting attachment with itemStoreId {0}.", storeId2);
            PropertyTagPropertyDefinition propertyTagPropertyDefinition = PropertyTagPropertyDefinition.CreateCustom("UrlCompName", 284360734U);
            string attachmentItself;

            using (Item item = Item.Bind(mailboxSession, storeId2))
            {
                AttachmentCollection attachmentCollection = item.AttachmentCollection;
                attachmentCollection.Load(new PropertyDefinition[]
                {
                    propertyTagPropertyDefinition
                });
                AttachmentId attachmentId2 = null;
                foreach (AttachmentHandle handle in attachmentCollection)
                {
                    using (Attachment attachment = attachmentCollection.Open(handle))
                    {
                        if (text2.Equals((string)attachment[propertyTagPropertyDefinition], StringComparison.Ordinal))
                        {
                            attachmentId2 = attachment.Id;
                            break;
                        }
                    }
                }
                if (attachmentId2 == null)
                {
                    foreach (AttachmentHandle handle2 in attachmentCollection)
                    {
                        using (Attachment attachment2 = attachmentCollection.Open(handle2))
                        {
                            string str = (string)attachment2[propertyTagPropertyDefinition];
                            if (text2.EndsWith("_" + str, StringComparison.Ordinal))
                            {
                                attachmentId2 = attachment2.Id;
                                break;
                            }
                        }
                    }
                }
                if (attachmentId2 == null)
                {
                    throw new ObjectNotFoundException(ServerStrings.MapiCannotOpenAttachmentId(attachmentId));
                }
                AirSyncDiagnostics.TraceDebug <AttachmentId>(ExTraceGlobals.RequestsTracer, null, "Getting attachment with attachment ID {0}.", attachmentId2);
                using (Attachment attachment3 = attachmentCollection.Open(attachmentId2))
                {
                    if (!maxAttachmentSize.IsUnlimited && attachment3.Size > (long)maxAttachmentSize.Value.ToBytes())
                    {
                        throw new DataTooLargeException(StatusCode.AttachmentIsTooLarge);
                    }
                    attachmentItself = AttachmentHelper.GetAttachmentItself(attachment3, outStream, offset, count, out total);
                }
            }
            return(attachmentItself);
        }