private double GetPointsOfMultipleChoiceQuestion(MultipleChoiceQuestion question)
{
var answers = Answers
.Where(x => x is MultipleChoiceAnswer)
.Select(y => y as MultipleChoiceAnswer)
.Where(z => z.GetQuestion().Id == question.Id)
.ToList();
return(CalculatePointsExactly(question, answers));
}
private double CalculatePointsExactly(MultipleChoiceQuestion question, List <MultipleChoiceAnswer> answers)
{
var rightUserChoices = 0;
var correctChoices = question.Choices.Where(x => x.Correct);
foreach (var choice in question.Choices)
{
var userChecked = answers.Any(x => x.ChoiceId == choice.Id);
if (userChecked && choice.Correct)
{
rightUserChoices++;
}
else if (userChecked && !choice.Correct)
{
rightUserChoices--;
}
}
double pointsPerRightChoice = (double)question.Points / (double)correctChoices.Count();
double allPoints = (double)rightUserChoices * (double)pointsPerRightChoice;
double wholePoints = Math.Floor(allPoints);
double commaPortion = allPoints - wholePoints;
double points = wholePoints;
if (commaPortion > 0 && commaPortion <= 0.5)
{
points += 0.5;
}
else if (commaPortion > 0.5 && commaPortion <= 1.0)
{
points += 1.0;
}
if (points > question.Points)
{
return(question.Points);
}
if (points < 0)
{
return(0);
}
return(points);
}
