public async Task <bool> CalculateCriteriaWeights(Guid choiceId)
{
var criteria = await _criterionRepository.GetByChoiceIDAsync(choiceId);
var hash = new Dictionary <Guid, int>();
int i = 0;
foreach (var criterion in criteria)
{
hash[criterion.CriteriaID] = i;
i++;
}
double[,] matrix = new double[criteria.Count, criteria.Count];
foreach (var criterion in criteria)
{
matrix[hash[criterion.CriteriaID], hash[criterion.CriteriaID]] = 1;
var comparisons = await _criteriaComparisonRepo.GetByFirstCriterionIDAsync(criterion.CriteriaID);
foreach (var comparison in comparisons)
{
matrix[hash[comparison.CriteriaID1], hash[comparison.CriteriaID2]] = comparison.CriteriaRatio;
matrix[hash[comparison.CriteriaID2], hash[comparison.CriteriaID1]] = 1 / comparison.CriteriaRatio;
}
}
var weights = _AHPService.CalculatePriortyVector(matrix);
double consistency = _AHPService.CalculateConsistency(matrix, weights);
if (consistency > 0.1)
{
//using (var uof = _unitOfWorkFactory.Create())
//{
foreach (var criterion in criteria)
{
var comparisons = await _criteriaComparisonRepo.GetByFirstCriterionIDAsync(criterion.CriteriaID);
foreach (var comparison in comparisons)
{
comparison.CriteriaRatio = 0;
await _criteriaComparisonRepo.UpdateAsync(comparison);
}
}
await _criteriaComparisonRepo.SaveAsync();
//uof.Commit();
return(false);
// }
}
return(await CalculateAlternativeWeights(choiceId, weights, criteria));
}
public async Task <List <ICriteriaComparisonModel> > UpdateAsync(List <ICriteriaComparisonModel> comparisons)
{
using (var uof = _unitOfWorkFactory.Create())
{
foreach (var comparison in comparisons)
{
var baseComparison = await _criteriaComparisonRepository.GetByIDAsync(comparison.CriteriaID1, comparison.CriteriaID2);
baseComparison.DateUpdated = DateTime.Now;
baseComparison.CriteriaRatio = comparison.CriteriaRatio;
await _criteriaComparisonRepository.UpdateAsync(baseComparison);
}
await _criteriaComparisonRepository.SaveAsync();
uof.Commit();
return(comparisons);
}
}