public override double CalculateScore(string answerProvided, out bool isCorrectAnswer, out bool isCompleteAnswer)
{
isCorrectAnswer = false;
isCompleteAnswer = false;
if (string.IsNullOrEmpty(answerProvided))
{
return(0);
}
var score = ScoreAwarded;
var provided = new HashSet <string>(answerProvided.ToLowerInvariant().Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries));
var correct = new HashSet <string>(CorrectAnswer.ToLowerInvariant().Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries));
if (provided.Count > correct.Count)
{
return(0);
}
var penaltyWeights = new [] { 1, 0.75, 0.5, 0.4, 0.3, 0.25, 0.2 };
var penaltyIndex = Math.Min(penaltyWeights.Length, correct.Count) - 1;
foreach (var c in correct)
{
if (!provided.Contains(c))
{
score -= (ScoreAwarded * penaltyWeights[penaltyIndex]);
penaltyIndex = Math.Max(0, penaltyIndex - 1);
}
}
isCorrectAnswer = score == ScoreAwarded;
isCompleteAnswer = provided.Count == correct.Count;
return(Math.Max(0, score));
}
public override double CalculateScore(string answerProvided, out bool isCorrectAnswer, out bool isCompleteAnswer)
{
isCorrectAnswer = false;
isCompleteAnswer = false;
if (string.IsNullOrEmpty(answerProvided))
{
return(0);
}
var answerIds = answerProvided.ToLowerInvariant().Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
var correctIds = CorrectAnswer.ToLowerInvariant().Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries);
if (answerIds.Length > correctIds.Length)
{
return(0);
}
var distance = answerIds.LevenshteinDistance(correctIds);
var penaltyWeights = new [] { 1, 0.75, 0.5, 0.4, 0.3, 0.25, 0.2 };
var startIndex = correctIds.Length - 1;
var score = ScoreAwarded;
for (var i = distance - 1; i >= 0; i--)
{
score -= penaltyWeights[i];
}
isCompleteAnswer = answerIds.Length == correctIds.Length;
isCorrectAnswer = distance == 0;
return(Math.Max(0, score));
}
