private void GradeTest()
{
List <Student> studentsThatAnswered = db.GetAllStudentsThatAnsweredToATest(currentTest, currentClass);
List <Question> allQuestions = db.GetAllQuestionsOfATest(currentTest.IdTest);
dgwTestResults.Rows.Clear(); // !!!! erase when fully debugged //
dgwTestResults.Columns.Clear(); // !!!! erase when fully debugged //
int gridRow = 0, gridColumn = 0;
GridAddData(gridRow, gridColumn, "Domande e risposte");
gridRow++;
gridColumn = 1;
List <Answer> correctQuestionAnswers;
// showing the correct answers and weights of the questions
foreach (Question q in allQuestions)
{
correctQuestionAnswers = db.GetAllCorrectAnswersToThisQuestionOfThisTest(
q.IdQuestion, currentTest.IdTest);
GridAddData(gridRow, gridColumn, q.Text);
GridAddData(gridRow, gridColumn + 1, "Risposte esatte");
GridAddData(gridRow, gridColumn + 2, "Costo errore");
// scan all the correct answers to this question
for (int iAnswer = 0; iAnswer < correctQuestionAnswers.Count; iAnswer++)
{
GridAddData(gridRow + iAnswer + 1, gridColumn,
((iAnswer + 1).ToString() + "- " + correctQuestionAnswers[iAnswer].Text));
GridAddData(gridRow + iAnswer + 1, gridColumn + 1,
correctQuestionAnswers[iAnswer].IsCorrect.ToString());
GridAddData(gridRow + iAnswer + 1, gridColumn + 2,
correctQuestionAnswers[iAnswer].ErrorCost.ToString());
}
// show the weight of the question
GridAddData(gridRow + correctQuestionAnswers.Count + 1, gridColumn, "Peso della domanda");
GridAddData(gridRow + correctQuestionAnswers.Count + 1, gridColumn + 1, q.Weight.ToString());
gridColumn += 3;
}
gridRow += 7;
gridColumn = 0;
GridAddData(gridRow, gridColumn, "Correzione delle risposte degli allievi");
gridRow++;
// showing and grading the answers of the students
foreach (Student s in studentsThatAnswered)
{
GridAddData(gridRow, gridColumn, s.LastName + " " + s.FirstName);
GridAddData(gridRow, gridColumn + 3, "Risposta allievo");
GridAddData(gridRow, gridColumn + 3, "Costo errori");
double weightedSum = 0;
double sumOfWeights = 0;
gridColumn = 0;
// grading of students' answers
foreach (Question q in allQuestions)
{
correctQuestionAnswers = db.GetAllCorrectAnswersToThisQuestionOfThisTest(
q.IdQuestion, currentTest.IdTest);
List <StudentsAnswer> studentsQuestionAnswers = db.GetAllAnswersOfAStudentToAQuestionOfThisTest(
s.IdStudent, q.IdQuestion, currentTest.IdTest);
int budgetOfQuestion = 100;
gridColumn++;
GridAddData(gridRow, gridColumn, q.Text);
// scan all the correct answers to this question
for (int iCorrectAnswer = 0; iCorrectAnswer < correctQuestionAnswers.Count; iCorrectAnswer++)
{
GridAddData(gridRow + iCorrectAnswer + 1, gridColumn,
(correctQuestionAnswers[iCorrectAnswer].Text));
bool found = false;
int budgetDecreaseForThisAnswer;
int iStudentAnswer;
// scan all the answers that the current student has given to this question
for (iStudentAnswer = 0; iStudentAnswer < studentsQuestionAnswers.Count;
iStudentAnswer++)
{
if (correctQuestionAnswers[iCorrectAnswer].IdAnswer ==
studentsQuestionAnswers[iStudentAnswer].IdAnswer)
{
found = true;
break;
}
}
if (found)
{
if (correctQuestionAnswers[iCorrectAnswer].IsCorrect ==
studentsQuestionAnswers[iStudentAnswer].StudentsBoolAnswer)
{ // if answer is correct it doesn't decrease the budget
budgetDecreaseForThisAnswer = 0;
}
else
{ // if not correct it decreases the budget of ErrorCost
budgetDecreaseForThisAnswer = (int)correctQuestionAnswers[iCorrectAnswer].ErrorCost;
budgetOfQuestion -= budgetDecreaseForThisAnswer;
}
GridAddData(gridRow + iCorrectAnswer + 1, gridColumn + 1,
studentsQuestionAnswers[iStudentAnswer].StudentsBoolAnswer.ToString());
}
else
{ // no answer: question is spoiled
budgetDecreaseForThisAnswer = 100;
budgetOfQuestion -= budgetDecreaseForThisAnswer;
GridAddData(gridRow + iCorrectAnswer + 1, gridColumn + 1, "No ans");
}
GridAddData(gridRow + iCorrectAnswer + 1, gridColumn + 2,
budgetDecreaseForThisAnswer.ToString());
GridAddData(gridRow + iCorrectAnswer + 1, gridColumn,
correctQuestionAnswers[iCorrectAnswer].Text);
if (budgetOfQuestion < 0)
{
budgetOfQuestion = 0;
}
}
GridAddData(gridRow + 5, gridColumn + 1, "Punti per domanda");
GridAddData(gridRow + 5, gridColumn + 2, budgetOfQuestion.ToString());
weightedSum += (double)q.Weight * budgetOfQuestion; // currently mean is NOT Weigthed !!!!
sumOfWeights += (double)q.Weight;
gridColumn += 2;
}
// weighted mean
double weightedMean = weightedSum / sumOfWeights;
GridAddData(gridRow, gridColumn + 1, "Media pesata");
GridAddData(gridRow + 1, gridColumn + 1, weightedMean.ToString());
gridRow += 7;
gridColumn = 0;
}
}