public int DeleteQuestions(QuestionModel question)
{
while (this.isUpdated)
{
}
this.isUpdated = true;
using (var context = new quizEntities())
{
var questionToRemove = context.Questions.SingleOrDefault(q => q.Id == question.IdDB);
context.Questions.Remove(questionToRemove);
var answersToRemove = context.Answers.Where(a => a.Id_Quest == question.IdDB).Select(a => a).ToList();
foreach (Answers a in answersToRemove)
{
context.Answers.Remove(a);
}
var linksToRemove = context.Table2.Where(l => l.IdQuest == question.IdDB).Select(l => l).ToList();
foreach (Table2 l in linksToRemove)
{
context.Table2.Remove(l);
}
context.SaveChanges();
}
this.isUpdated = false;
return(0);
}
public IHttpActionResult onlineexam()
{
quizEntities nd = new quizEntities();
IList <OnlineexamClass> oe = nd.onlineexams.Include("onlineexam").Select(x => new OnlineexamClass()
{
Qid = x.Qid,
Question = x.Question,
Option1 = x.option1,
Option2 = x.option2,
Option3 = x.option3,
Option4 = x.option4,
corrans = x.Correctans
}).ToList <OnlineexamClass>();
return(Ok(oe));
}
public int DeleteTest(TestModel test)
{
this.isUpdated = true;
using (var context = new quizEntities())
{
var testToRemove = context.Tests.SingleOrDefault(t => t.Id == test.IdDB);
context.Tests.Remove(testToRemove);
var linksToRemove = context.Table2.Where(l => l.IdTest == test.IdDB).Select(l => l).ToList();
foreach (Table2 l in linksToRemove)
{
context.Table2.Remove(l);
}
context.SaveChanges();
}
this.isUpdated = false;
return(0);
}
public BindableCollection <QuestionModel> GetQuestionsForTest(int id)
{
BindableCollection <QuestionModel> retQuestions = new BindableCollection <QuestionModel>();
using (var context = new quizEntities())
{
var linksDB = context.Table2.Where(l => l.IdTest == id).Select(l => l).ToList();
foreach (Table2 l in linksDB)
{
var questionDB = context.Questions.Where(q => q.Id == l.IdQuest).Select(q => q).First();
QuestionModel retQ = new QuestionModel(questionDB.Id, questionDB.QuestionText);
foreach (AnswerModel a in this.GetAnswers(retQ.IdDB))
{
retQ.Answers.Add(a);
}
retQuestions.Add(retQ);
}
}
return(retQuestions);
}
public BindableCollection <AnswerModel> GetAnswers(int id)
{
BindableCollection <AnswerModel> retAnswers = new BindableCollection <AnswerModel>();
using (var context = new quizEntities())
{
var answersDB = context.Answers.Where(a => a.Id_Quest == id).Select(a => a).ToList();
foreach (Answers a in answersDB)
{
AnswerModel ans = new AnswerModel(a.Id, a.textAnswer);
if (a.Correct == 1)
{
ans.Correct = true;
}
else
{
ans.Correct = false;
}
retAnswers.Add(ans);
}
}
return(retAnswers);
}
public BindableCollection <QuestionModel> GetQuestions()
{
this._eventAggregator.PublishOnUIThread(new CursorMessageModel(System.Windows.Input.Cursors.Wait, (int)Task.CurrentId));
while (this.isUpdated)
{
}
BindableCollection <QuestionModel> retQuestions = new BindableCollection <QuestionModel>();
using (var context = new quizEntities())
{
var questionsDB = context.Questions.Select(q => q).ToList();
foreach (Questions q in questionsDB)
{
QuestionModel retQ = new QuestionModel(q.Id, q.QuestionText);
foreach (AnswerModel a in this.GetAnswers(retQ.IdDB))
{
retQ.Answers.Add(a);
}
retQuestions.Add(retQ);
}
}
this._eventAggregator.PublishOnUIThread(new CursorMessageModel(System.Windows.Input.Cursors.Arrow, (int)Task.CurrentId));
return(retQuestions);
}
public BindableCollection <TestModel> GetTests()
{
this._eventAggregator.PublishOnUIThread(new CursorMessageModel(System.Windows.Input.Cursors.Wait, (int)Task.CurrentId));
while (this.isUpdated)
{
}
BindableCollection <TestModel> retTests = new BindableCollection <TestModel>();
using (var context = new quizEntities())
{
var testsDB = context.Tests.Select(t => t).ToList();
foreach (Tests t in testsDB)
{
TestModel retT = new TestModel(t.Id, t.Title, t.Description);
foreach (QuestionModel q in this.GetQuestionsForTest(retT.IdDB))
{
retT.Questions.Add(q);
}
retTests.Add(retT);
}
}
this._eventAggregator.PublishOnUIThread(new CursorMessageModel(System.Windows.Input.Cursors.Arrow, (int)Task.CurrentId));
return(retTests);
}
public int UpdateQuestions(QuestionModel question)
{
while (this.isUpdated)
{
}
this.isUpdated = true;
int max_a;
int max_q;
if (question.IdDB == -1)
{
using (var context = new quizEntities())
{
try
{
max_q = context.Questions.Max(l => l.Id);
max_q++;
}
catch (System.InvalidOperationException)
{
max_q = 1;
}
var questionRow = new Questions()
{
Id = max_q,
QuestionText = question.QuestionText.Trim()
};
context.Questions.Add(questionRow);
context.SaveChanges();
foreach (AnswerModel a in question.Answers)
{
try
{
max_a = context.Answers.Max(l => l.Id);
max_a++;
}
catch (System.InvalidOperationException)
{
max_a = 1;
}
int correct;
if (a.Correct == true)
{
correct = 1;
}
else
{
correct = 0;
}
var answerRow = new Answers()
{
Id = max_a,
Id_Quest = questionRow.Id,
Correct = correct,
textAnswer = a.Answer,
};
context.Answers.Add(answerRow);
context.SaveChanges();
}
}
}
else
{
using (var context = new quizEntities())
{
var existingQuestion = context.Questions.SingleOrDefault(q => q.Id == question.IdDB);
existingQuestion.QuestionText = question.QuestionText.Trim();
context.SaveChanges();
var answersToRemove = context.Answers.Where(a => a.Id_Quest == question.IdDB).Select(a => a).ToList();
foreach (Answers a in answersToRemove)
{
context.Answers.Remove(a);
}
context.SaveChanges();
foreach (AnswerModel a in question.Answers)
{
try
{
max_a = context.Answers.Max(l => l.Id);
max_a++;
}
catch (System.InvalidOperationException)
{
max_a = 1;
}
int correct;
if (a.Correct == true)
{
correct = 1;
}
else
{
correct = 0;
}
var answerRow = new Answers()
{
Id = max_a,
Id_Quest = question.IdDB,
Correct = correct,
textAnswer = a.Answer,
};
context.Answers.Add(answerRow);
context.SaveChanges();
}
}
}
this.isUpdated = false;
return(0);
}
public int UpdateTest(TestModel t)
{
while (this.isUpdated == true)
{
}
this.isUpdated = true;
int max_t;
int max_l;
if (t.IdDB == -1)
{
using (var context = new quizEntities())
{
try
{
max_t = context.Tests.Max(ts => ts.Id);
max_t++;
}
catch (System.InvalidOperationException)
{
max_t = 1;
}
var test = new Tests()
{
Id = max_t,
Title = t.Title.Trim(),
Description = t.Description.Trim()
};
context.Tests.Add(test);
context.SaveChanges();
foreach (QuestionModel q in t.Questions)
{
try
{
max_l = context.Table2.Max(l => l.Id);
max_l++;
}
catch (System.InvalidOperationException)
{
max_l = 1;
}
var table = new Table2()
{
Id = max_l,
IdQuest = q.IdDB,
IdTest = test.Id,
};
context.Table2.Add(table);
context.SaveChanges();
}
}
}
else
{
using (var context = new quizEntities())
{
this.DeleteTest(t);
var test = new Tests()
{
Id = t.IdDB,
Title = t.Title.Trim(),
Description = t.Description.Trim()
};
context.Tests.Add(test);
context.SaveChanges();
foreach (QuestionModel q in t.Questions)
{
try
{
max_l = context.Table2.Max(l => l.Id);
max_l++;
}
catch (System.InvalidOperationException)
{
max_l = 1;
}
var table = new Table2()
{
Id = max_l,
IdQuest = q.IdDB,
IdTest = test.Id,
};
context.Table2.Add(table);
context.SaveChanges();
}
}
}
this.isUpdated = false;
return(0);
}
