CmisSync.Lib.Sync.CmisRepo.SynchronizedFolder.UploadFile C# (CSharp) Метод

            private bool UploadFile(string filePath, IFolder remoteFolder) // TODO make SyncItem
            {
                SleepWhileSuspended();

                var syncItem = database.GetSyncItemFromLocalPath(filePath);
                if (null == syncItem)
                {
                    syncItem = SyncItemFactory.CreateFromLocalPath(filePath, false, repoInfo, database);
                }

                try
                {
                    IDocument remoteDocument = null;
                    byte[] filehash = { };

                    // Prepare properties
                    string remoteFileName = syncItem.RemoteLeafname;
                    Dictionary<string, object> properties = new Dictionary<string, object>();
                    properties.Add(PropertyIds.Name, remoteFileName);
                    properties.Add(PropertyIds.ObjectTypeId, "cmis:document");
                    properties.Add(PropertyIds.CreationDate, File.GetCreationTime(syncItem.LocalPath));
                    properties.Add(PropertyIds.LastModificationDate, File.GetLastWriteTime(syncItem.LocalPath));

                    // Prepare content stream
                    using (Stream file = File.Open(syncItem.LocalPath, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
                    using (SHA1 hashAlg = new SHA1Managed())
                    using (CryptoStream hashstream = new CryptoStream(file, hashAlg, CryptoStreamMode.Read))
                    {
                        ContentStream contentStream = new ContentStream();
                        contentStream.FileName = remoteFileName;
                        contentStream.MimeType = MimeType.GetMIMEType(remoteFileName);
                        contentStream.Length = file.Length;
                        contentStream.Stream = hashstream;

                        Logger.InfoFormat("Uploading: {0} as {1}/{2}",syncItem.LocalPath, remoteFolder.Path, remoteFileName);
                        remoteDocument = remoteFolder.CreateDocument(properties, contentStream, null);
                        Logger.InfoFormat("Uploaded: {0}", syncItem.LocalPath);
                        filehash = hashAlg.Hash;
                    }

                    // Get metadata. Some metadata has probably been automatically added by the server.
                    Dictionary<string, string[]> metadata = FetchMetadata(remoteDocument);

                    // Create database entry for this file.
                    database.AddFile(syncItem, remoteDocument.Id, remoteDocument.LastModificationDate, metadata, filehash);
                    Logger.Info("Added file to database: " + syncItem.LocalPath);
                    return true;
                }
                catch (Exception e)
                {
                    ProcessRecoverableException("Could not upload file: " + syncItem.LocalPath, e);
                    return false;
                }
            }