public static Exm ProcessAnswers(Exm exam, AnswerSheet answersheet)
{
foreach (Question question in exam.Questions)
{
foreach (Answer answer in answersheet.Answers)
{
if (answer.QuestionId == question.Id)
{
bool isAnswerCorrect = true;
foreach (Option opt in question.Options)
{
if (opt.IsCorrect)
{
if (!answer.SelectedOptionIds.Contains(opt.Id))
{
isAnswerCorrect = false;
}
}
else
{
if (answer.SelectedOptionIds.Contains(opt.Id))
{
isAnswerCorrect = false;
}
}
}
question.CalculatedScore = isAnswerCorrect ? question.Score.True : question.Score.False;
question.SubmittedAnswer = answer;
}
}
}
return(exam);
}
public static int SaveAnswerSheet(int userId, int examId, AnswerSheet answerSheet)
{
//get Score
Exm exam = GetExam(examId);
int score = CalculateScore(exam, answerSheet);
return(ExamResultDBHelper.SaveAnswers(userId, examId, answerSheet.ToString(), score));
}
public static Exm GetExam(int examId)
{
string examXml = ExamDBHelaper.GetExam(examId);
if (!string.IsNullOrEmpty(examXml))
{
XmlDocument doc = new XmlDocument();
doc.LoadXml(examXml);
Exm exam = Exm.Populate(doc);
return(exam);
}
return(null);
}
public static int CalculateScore(Exm exam, AnswerSheet answersheet)
{
int score = 0;
foreach (Question question in exam.Questions)
{
foreach (Answer answer in answersheet.Answers)
{
if (answer.QuestionId == question.Id)
{
bool isAnswerCorrect = true;
foreach (Option opt in question.Options)
{
if (opt.IsCorrect)
{
if (!answer.SelectedOptionIds.Contains(opt.Id))
{
isAnswerCorrect = false;
}
}
else
{
if (answer.SelectedOptionIds.Contains(opt.Id))
{
isAnswerCorrect = false;
}
}
}
if (isAnswerCorrect)
{
score += question.Score.True;
}
else
{
score += question.Score.False;
}
}
}
}
return(score);
}
protected void Page_Load(object sender, EventArgs e)
{
Exm exam = ExamHelper.GetExam(this.ExamId);
if (IsAnswerMode)
{
AnswerSheet answersheet = AnswerHelper.GetAnswerSheet(this.SubmittedUserId, this.ExamId);
//feed submitted answers
exam = ExamHelper.ProcessAnswers(exam, answersheet);
divExamDetails.Visible = false;
}
if (exam != null)
{
litIstructions.Text = exam.Instructions != null ? exam.Instructions : "-";
litTime.Text = exam.TimeInSeconds.HasValue ? Utils.TimeString(exam.TimeInSeconds.Value) : "-";
repQuestions.DataSource = exam.Questions;
repQuestions.DataBind();
}
}
public static Question NextQuestion(Exm exam, AnswerSheet answersheet)
{
foreach (Question question in exam.Questions)
{
bool unAnswered = true;
if (answersheet != null)
{
foreach (Answer answer in answersheet.Answers)
{
if (answer.QuestionId == question.Id)
{
unAnswered = false;
}
}
}
if (unAnswered)
{
return(question);
}
}
return(null);
}
private void _SetUIAndBindData()
{
Exm exam = ExamHelper.GetExam(this.ExamId);
AnswerSheet answersheet = AnswerHelper.GetAnswerSheet(this.UserId, this.ExamId);
if (!Page.IsPostBack)
{
divQuestionContainer.Visible = false;
divMessage.Visible = false;
divWelcome.Visible = true;
litIstructions.Text = exam.Instructions != null ? exam.Instructions : "-";
litTime.Text = exam.TimeInSeconds.HasValue ? Utils.TimeString(exam.TimeInSeconds.Value) : "-";
return;
}
else if (answersheet != null && answersheet.Answers.Count == exam.Questions.Count)
{
divQuestionContainer.Visible = false;
divMessage.Visible = true;
divWelcome.Visible = false;
//lblMessage.Text = "Finished!";
}
else if (answersheet == null || answersheet.Answers.Count < exam.Questions.Count)
{
divQuestionContainer.Visible = true;
divMessage.Visible = false;
divWelcome.Visible = false;
Question question = ExamHelper.NextQuestion(exam, answersheet);
if (question != null)
{
populateQuestionUI(question);
}
}
}
