public void UpdateInstance(QuestionInstance instance)
{
var ctx = QuizlrContext.Current;
ctx.QuestionInstances.Attach(instance);
ctx.Entry(instance).State = EntityState.Modified;
ctx.SaveChanges();
}
public QuestionInstance CreateInstance(QuestionInstance instance)
{
var ctx = QuizlrContext.Current;
ctx.QuestionInstances.Add(instance);
ctx.SaveChanges();
return instance;
}
private void SaveQuestion()
{
if (_isComplete || _questionInstance == null)
return;
if (SelectedAnswer == null)
throw new InvalidOperationException("This should not happen.");
_questionInstance.Value = SelectedAnswer.Text;
_questionInstance.IsCorrect = SelectedAnswer.IsCorrect;
_questionInstance.Completed = DateTime.Now;
_questionInstance = _questionInstanceRepository.CreateInstance(_questionInstance);
foreach (var answer in Answers)
{
var instance = (AnswerInstance) answer.Poco;
instance.QuestionInstanceId = _questionInstance.QuestionInstanceId;
_answerInstanceRepository.CreateInstance(instance);
}
_hasAnswers = true;
}
private void NextQuestion()
{
SaveQuestion();
if (_enumerator.MoveNext())
{
QuestionIndex++;
CurrentQuestion = new QuestionViewModel(_enumerator.Current.Question);
_questionInstance = CurrentQuestion.Poco;
_questionInstance.QuizInstanceId = _quizInstance.QuizInstanceId;
SelectedAnswer = null;
return;
}
StopQuiz();
}
private void ResetQuiz()
{
ResetStats();
if (CurrentQuiz == null)
{
Invalidate();
return;
}
_quizInstance = _quizInstanceRepository.CreateInstance(CurrentQuiz.Poco);
_questionInstance = null;
_enumerator = _currentQuiz.QuizQuestions.GetEnumerator();
QuestionCount = _currentQuiz.QuizQuestionCount;
QuestionIndex = 0;
NextQuestion();
Invalidate();
}
public void DeleteInstance(QuestionInstance instance)
{
var ctx = QuizlrContext.Current;
ctx.QuestionInstances.Remove(instance);
ctx.SaveChanges();
}
