DocumentDB query using simple lambda expressions

DocumentDbRepository.cs

        /// <summary>
        /// Fetches the photo stream data for a specified user.
        /// </summary>
        /// <param name="userId">The user id.</param>
        /// <param name="continuationToken">Last captured ticks in the form of a string.</param>
        /// <returns>List of photos up to the page size.</returns>
        public async Task<PagedResponse<PhotoContract>> GetUserPhotoStream(string userId, string continuationToken)
        {
            var feedOptions = new FeedOptions
            {
                MaxItemCount = PhotoStreamPageSize,
                RequestContinuation = continuationToken
            };

            var query = _documentClient.CreateDocumentQuery<PhotoDocument>(DocumentCollectionUri,
                feedOptions)
                .Where(d => d.DocumentType == PhotoDocument.DocumentTypeIdentifier)
                .Where(d => d.DocumentVersion == _currentDocumentVersion)
                .Where(p => p.UserId == userId)
                .OrderByDescending(p => p.CreatedDateTime.Epoch)
                .AsDocumentQuery();

            var documentResponse = await query.ExecuteNextAsync<PhotoDocument>();

            var photoContracts = await CreatePhotoContractsAndLoadUserData(documentResponse.ToList());

            var result = new PagedResponse<PhotoContract>
            {
                Items = photoContracts,
                ContinuationToken = documentResponse.ResponseContinuation
            };

            return result;
        }