//gets the answer options for a given question id
private void SetAnswerOptionsForQuestion(quiz_dbContext _context)
{
//initialize list of answer options
var dbAnswers = new List <Answer>();
//get the answer options for this question from the DB
dbAnswers = (from c in _context.Answers select c).Where(p => p.QuestionId == id).ToList();
//throw an exception if no answers were found
if (dbAnswers.Count == 0)
{
throw new Exception("No answer options could be found for question id " + id);
}
answers = new List <AnswerDisplay>();
foreach (Answer a in dbAnswers)
{
//define the properties of each viewmodel
AnswerDisplay currentAnswer = new AnswerDisplay();
currentAnswer.answerText = a.AnswerText;
currentAnswer.id = a.Id;
answers.Add(currentAnswer);
}
}
//intializes the next question object, whether there is a question left or just the score
public void ShowNextQuestionOrScore(quiz_dbContext _context)
{
using (_context)
{
//get first question that has not been answered
Question Question = _context.Questions.FirstOrDefault(q => q.IsComplete == false);
//if the question exists, then fetch the corresponding answers
if (Question != null)
{
questionText = Question.QuestionText;
id = Question.Id;
//get answers associated with question
SetAnswerOptionsForQuestion(_context);
shuffleAnswers();
}
//if there is no answered question, the quiz is finished, so calculate the user score
else
{
//get all user selected answers options
var dbAnswers = (from c in _context.Answers select c).Where(p => p.WasSelected == true).ToList();
int questionCount = _context.Questions.Count(); //get number of questions answered
//calculate the percentage
CalculatePercentage(dbAnswers, questionCount);
}
}
//return currentQuestion;
}
public HomeController(quiz_dbContext context)
{
//make the DB context available for all methods of HomeController
_context = context;
}