Error "Must set UnitOfWorkManager before use it" - aspnetboilerplate

Question

I'm developing the service within ASP.NET Boilerplate engine and getting the error from the subject. The nature of the error is not clear, as I inheriting from ApplicationService, as documentation suggests. The code:
namespace MyAbilities.Api.Blob
{
public class BlobService : ApplicationService, IBlobService
{
public readonly IRepository<UserMedia, int> _blobRepository;
public BlobService(IRepository<UserMedia, int> blobRepository)
{
_blobRepository = blobRepository;
}
public async Task<List<BlobDto>> UploadBlobs(HttpContent httpContent)
{
var blobUploadProvider = new BlobStorageUploadProvider();
var list = await httpContent.ReadAsMultipartAsync(blobUploadProvider)
.ContinueWith(task =>
{
if (task.IsFaulted || task.IsCanceled)
{
if (task.Exception != null) throw task.Exception;
}
var provider = task.Result;
return provider.Uploads.ToList();
});
// store blob info in the database
foreach (var blobDto in list)
{
SaveBlobData(blobDto);
}
return list;
}
public void SaveBlobData(BlobDto blobData)
{
UserMedia um = blobData.MapTo<UserMedia>();
_blobRepository.InsertOrUpdateAndGetId(um);
CurrentUnitOfWork.SaveChanges();
}
public async Task<BlobDto> DownloadBlob(int blobId)
{
// TODO: Implement this helper method. It should retrieve blob info
// from the database, based on the blobId. The record should contain the
// blobName, which should be returned as the result of this helper method.
var blobName = GetBlobName(blobId);
if (!String.IsNullOrEmpty(blobName))
{
var container = BlobHelper.GetBlobContainer();
var blob = container.GetBlockBlobReference(blobName);
// Download the blob into a memory stream. Notice that we're not putting the memory
// stream in a using statement. This is because we need the stream to be open for the
// API controller in order for the file to actually be downloadable. The closing and
// disposing of the stream is handled by the Web API framework.
var ms = new MemoryStream();
await blob.DownloadToStreamAsync(ms);
// Strip off any folder structure so the file name is just the file name
var lastPos = blob.Name.LastIndexOf('/');
var fileName = blob.Name.Substring(lastPos + 1, blob.Name.Length - lastPos - 1);
// Build and return the download model with the blob stream and its relevant info
var download = new BlobDto
{
FileName = fileName,
FileUrl = Convert.ToString(blob.Uri),
FileSizeInBytes = blob.Properties.Length,
ContentType = blob.Properties.ContentType
};
return download;
}
// Otherwise
return null;
}
//Retrieve blob info from the database
private string GetBlobName(int blobId)
{
throw new NotImplementedException();
}
}
}
The error appears even before the app flow jumps to 'SaveBlobData' method. Am I missed something?

Answer 1

Hate to answer my own questions, but here it is... after a while, I found out that if UnitOfWorkManager is not available for some reason, I can instantiate it in the code, by initializing IUnitOfWorkManager in the constructor. Then, you can simply use the following construction in your Save method:
using (var unitOfWork = _unitOfWorkManager.Begin())
{
//Save logic...
unitOfWork.Complete();
}