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");
        }
Ejemplo n.º 3
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        public static List <Answer> getAnswerOffline(string idQuestion)
        {
            AnswerDatabaseAccess answerDB = new AnswerDatabaseAccess();

            return(answerDB.GetAnswerDb(idQuestion));
        }