public QuizVersion AddQuizVersionIfNeeded(string courseId, QuizSlide slide)
{
var slideId = slide.Id;
var quizXml = slide.QuizNormalizedXml;
var lastQuizVersion = GetLastQuizVersion(courseId, slideId);
var newQuizVersion = new QuizVersion
{
CourseId = courseId,
SlideId = slideId,
LoadingTime = DateTime.Now,
NormalizedXml = quizXml
};
if (lastQuizVersion == null || lastQuizVersion.NormalizedXml != newQuizVersion.NormalizedXml)
{
db.QuizVersions.Add(newQuizVersion);
db.SaveChanges();
return(newQuizVersion);
}
return(lastQuizVersion);
}
public void Delete(UserQuestion userSolution)
{
db.UserQuestions.Remove(userSolution);
db.SaveChanges();
}