public async Task DownloadLesson(List <Lesson> ListLesson, string idLesson)
{
string nameLesson = null; //lưu tên Lesson để thông báo
// Download Lesson
foreach (var myLesson in ListLesson)
{
if (myLesson.Id.Equals(idLesson))
{
nameLesson = myLesson.Name.Trim();
lessonDb = new LessonDatabaseAccess();
lessonDb.AddLesson(myLesson);
break;
}
}
RestQuestionService resQuestionService = new RestQuestionService();
List <Question> myLstQuestion = await resQuestionService.GetDataWithIDAsync(idLesson); // Lấy các câu hỏi có trong Lesson
questionDb = new QuestionDatabaseAccess();
answerDb = new AnswerDatabaseAccess();
foreach (var myQuestion in myLstQuestion)
{
questionDb.AddQuestion(myQuestion); // Download Question
RestAnswerService resAnswerService = new RestAnswerService();
List <Answer> myLstAnswer = await resAnswerService.GetDataWithIDAsync(myQuestion.QuestionID); // Lấy các câu trả lời có trong cầu hỏi
foreach (var myAnswer in myLstAnswer)
{
answerDb.AddAnswer(myAnswer); //Download Answer
}
}
DependencyService.Get <IMessage>().LongToast("Download " + nameLesson + " Completed");
}
public async Task DeleteLesson(string idLesson)
{
questionDb = new QuestionDatabaseAccess();
List <Question> myLstQuestion = new List <Question>();
myLstQuestion = questionDb.GetQuestionDb(idLesson);
foreach (var myQuestion in myLstQuestion)
{
// Thực hiện xóa câu trả lời
answerDb = new AnswerDatabaseAccess();
answerDb.DeleteAnswer(myQuestion.QuestionID);
}
// Thực hiện xóa câu hỏi
questionDb.DeleteQuestion(idLesson);
// Thực hiện xóa Lesson
lessonDb = new LessonDatabaseAccess();
lessonDb.DeleteLesson(idLesson);
DependencyService.Get <IMessage>().ShortToast("Delete completed");
}
public static List <Answer> getAnswerOffline(string idQuestion)
{
AnswerDatabaseAccess answerDB = new AnswerDatabaseAccess();
return(answerDB.GetAnswerDb(idQuestion));
}