/// <summary>
/// Checks if the answer is correct
/// </summary>
/// <param name="Answer">Answer to validate</param>
/// <returns>Number of points for this answer depending on current valuation criteria</returns>
public override int CheckAnswer(Answer Answer)
{
if (Answer == null)
{
throw new NullReferenceException();
}
var TargetAnswer = Answer as MultipleCheckBoxesAnswer;
// The type should match but need to check it just in case
if (TargetAnswer == null)
{
throw new Exception("Answer type does not match the question type");
}
if (TargetAnswer.UserAnswer.Count != CorrectAnswer.Count)
{
throw new Exception("Answers count does not match this question");
}
if (Answer.IsEmpty())
{
return(0);
}
var CorrectAnswersNumber = 0;
// Get how many answers user got right
for (var i = 0; i < Options.Count; i++)
{
if (TargetAnswer.UserAnswer[i] == CorrectAnswer[i])
{
CorrectAnswersNumber++;
}
}
// TODO: DECIDE ON ROUNDING (CEIL OR FLOOR)
// Based on evaluation mode givem them proper ammount of points
switch (Scoring.Mode)
{
case ScoringMode.FullAnswer:
return(CorrectAnswersNumber == CorrectAnswer.Count ? Scoring.FullPointScore : 0);
case ScoringMode.HalfTheAnswer:
// Less than the half: 0 points
if (CorrectAnswersNumber < CorrectAnswer.Count / 2)
{
return(0);
}
// If the score is between the half and max: half the points
if (CorrectAnswersNumber < CorrectAnswer.Count)
{
return(Scoring.FullPointScore / 2);
}
// Full score: full points
return(Scoring.FullPointScore);
case ScoringMode.EvenParts:
// For each asnwer give a proper ammount of poitns
// NOTE: Can be done by ceil or floor rounding.
return(Scoring.FullPointScore * CorrectAnswersNumber / CorrectAnswer.Count);
default:
Debugger.Break();
throw new Exception("Answer check failed. No evaluating mode detected.");
}
}