public IEnumerable <FileDto> GetFiles(GetFilesCommand command) { if (command.ReferenceId == Guid.Empty) { return(null); } var files = FileRepository.GetFilesByReferenceId(command.ReferenceId); if (!string.IsNullOrWhiteSpace(command.ContentType)) { return(files.Where(f => f.ContentType.Contains(command.ContentType)).Select(FileAdapter.ToFileDto).AsEnumerable()); } var fileDtoList = new List <FileDto>(); Parallel.ForEach(files, file => { var url = AzureContainer.GetFileUrl($"{file.Id}_{file.Name}"); var fileDto = new FileDto() { Id = file.Id, Size = file.Size, ContentType = file.ContentType, Name = file.Name, Content = url }; fileDtoList.Add(fileDto); }); return(fileDtoList.AsEnumerable()); }