private void AddQuestionToList(TestQuestion question)
{
if (Questions.Count < PageCount)
{
Questions.Add(question);
}
}
/// <summary>
/// Generates question with answers
/// </summary>
/// <returns>TestQuestion</returns>
public static TestQuestion CreateQuestion(string questionText, int idQuestion, params TestAnswer[] answers)
{
TestQuestion question = new TestQuestion();
question.QuestionText = questionText;
question.QuestionId = idQuestion;
question.Answers.AddRange(answers);
return(question);
}
/// <summary>
/// Function to get given uncorrect answer's id
/// </summary>
/// <param name="pageIndex">current page index</param>
/// <param name="question">current question</param>
/// <returns>Uncorrect answer id, if it was found</returns>
private int?wrongAnswerId(int pageIndex, TestQuestion question)
{
int?wrongAnswerId = null;
// if all questions have been answered
if (GivenAnswers != null && GivenAnswers.Count == PageCount)
{
var givenAnswerId = GivenAnswers[pageIndex - 1];
var answ = question.Answers;
var correctId = answ.Where(a => a.IsCorrectAnswer);
if (givenAnswerId != correctId.First().Id)
{
wrongAnswerId = givenAnswerId;
}
}
return(wrongAnswerId);
}
public override void GetItems(int pageSize, int pageIndex)
{
CurrentQuestion = new TestQuestion();
Items = new AdvancedObservableCollection <TestAnswer>();
switch (pageIndex)
{
case 1:
{
var correctAnswers =
QuestionsGenerator.GenerateFirstQuestion(null);
var answerId = wrongAnswerId(PageIndex, correctAnswers);
CurrentQuestion = QuestionsGenerator.GenerateFirstQuestion(answerId);
break;
}
case 2:
{
var correctAnswers =
QuestionsGenerator.GenerateSecondQuestion(null);
var answerId = wrongAnswerId(PageIndex, correctAnswers);
CurrentQuestion = QuestionsGenerator.GenerateSecondQuestion(answerId);
break;
}
case 3:
{
var correctAnswers =
QuestionsGenerator.GenerateThirdQuestion(null);
var answerId = wrongAnswerId(PageIndex, correctAnswers);
CurrentQuestion = QuestionsGenerator.GenerateThirdQuestion(answerId);
break;
}
case 4:
{
var correctAnswers =
QuestionsGenerator.GenerateFourthQuestion(null);
var answerId = wrongAnswerId(PageIndex, correctAnswers);
CurrentQuestion = QuestionsGenerator.GenerateFourthQuestion(answerId);
break;
}
case 5:
{
var correctAnswers =
QuestionsGenerator.GenerateFifthQuestion(null);
var answerId = wrongAnswerId(PageIndex, correctAnswers);
CurrentQuestion = QuestionsGenerator.GenerateFifthQuestion(answerId);
break;
}
case 6:
{
var correctAnswers =
QuestionsGenerator.GenerateSixthQuestion(null);
var answerId = wrongAnswerId(PageIndex, correctAnswers);
CurrentQuestion = QuestionsGenerator.GenerateSixthQuestion(answerId);
break;
}
}
Items.AddRange(CurrentQuestion.Answers);
AddQuestionToList(CurrentQuestion);
}