async Task GetStudents()
{
try
{
this.IsRefreshing = true;
var connection = await studentService.CheckConnection();
if (!connection)
{
this.IsRefreshing = false;
await Application.Current.MainPage.DisplayAlert("Error", "No internet connection", "Cancel");
return;
}
var listStudents = (await studentService.GetAll(Endpoints.GET_STUDENTS)).Select(x => ToStudentItemViewModel(x));
this.AllStudents = listStudents.ToList();
this.Students = new ObservableCollection <StudentItemViewModel>(listStudents);
this.IsRefreshing = false;
}
catch (Exception ex)
{
this.IsRefreshing = false;
await Application.Current.MainPage.DisplayAlert("Error", ex.Message, "Cancel");
}
}
async Task DeleteStudent()
{
var answer = await Application.Current.MainPage.DisplayAlert("Confirm", "Delete confirm", "Yes", "No");
if (!answer)
{
return;
}
var connection = await studentService.CheckConnection();
if (!connection)
{
await Application.Current.MainPage.DisplayAlert("Error", "No internet connection", "Cancel");
return;
}
await studentService.Delete(Endpoints.DELETE_STUDENTS, this.ID);
await Application.Current.MainPage.DisplayAlert("Message", "The process is successful", "Confirm");
var studentViewModel = StudentsViewModel.GetInstance();
var studentDelete = studentViewModel.AllStudents.FirstOrDefault(x => x.ID == this.ID);
studentViewModel.AllStudents.Remove(studentDelete);
studentViewModel.GetStudentsByName();
}
async Task GetStudentsByCourse()
{
try
{
this.IsRefreshing = true;
var connection = await studentService.CheckConnection();
if (!connection)
{
this.IsRefreshing = false;
await Application.Current.MainPage.DisplayAlert("Error", "No internet connection", "Cancel");
return;
}
var listStudents = (await studentService.GetAll(Endpoints.GET_STUDENTS_BY_COURSE + this.course.CourseID)).OrderByDescending(x => x.ID);
this.Students = new ObservableCollection <StudentDTO>(listStudents);
this.IsRefreshing = false;
}
catch (Exception ex)
{
this.IsRefreshing = false;
await Application.Current.MainPage.DisplayAlert("Error", ex.Message, "Cancel");
}
}
async Task EditStudent()
{
try
{
if (string.IsNullOrEmpty(this.Student.LastName))
{
await Application.Current.MainPage.DisplayAlert("Error", "You must enter the field LastName", "Cancel");
return;
}
this.IsRunning = true;
this.IsEnabled = false;
var connection = await studentService.CheckConnection();
if (!connection)
{
this.IsRunning = false;
this.IsEnabled = true;
await Application.Current.MainPage.DisplayAlert("Error", "No internet connection", "Cancel");
return;
}
var studentDTO = new StudentDTO {
ID = this.Student.ID, LastName = this.Student.LastName, FirstMidName = this.Student.FirstMidName, EnrollmentDate = this.Student.EnrollmentDate
};
await studentService.Update(Endpoints.PUT_STUDENTS, this.Student.ID, studentDTO);
this.IsRunning = false;
this.IsEnabled = true;
await Application.Current.MainPage.DisplayAlert("Message", "The process is successful", "Cancel");
this.Student.ID = this.Student.ID = 0;
this.Student.LastName = string.Empty;
this.Student.FirstMidName = string.Empty;
this.Student.EnrollmentDate = DateTime.Now;
await Application.Current.MainPage.Navigation.PopAsync();
}
catch (Exception ex)
{
this.IsRunning = false;
this.IsEnabled = true;
await Application.Current.MainPage.DisplayAlert("Error", ex.Message, "Cancel");
}
}
async Task CreateStudent()
{
try
{
if (string.IsNullOrEmpty(this.LastName))
{
await Application.Current.MainPage.DisplayAlert("Error", "You must enter the field lastName", "Cancel");
return;
}
this.IsRunning = true;
this.IsEnabled = false;
var connection = await studentService.CheckConnection();
if (!connection)
{
this.IsRunning = false;
this.IsEnabled = true;
await Application.Current.MainPage.DisplayAlert("Error", "No internet connection", "Cancel");
return;
}
var studentDTO = new StudentDTO {
LastName = this.LastName, FirstMidName = this.FirstMidName, EnrollmentDate = this.EnrollmentDate
};
await studentService.Create(Endpoints.POST_Students, studentDTO);
this.IsRunning = false;
this.IsEnabled = true;
await Application.Current.MainPage.DisplayAlert("Message", "The process is successful", "Cancel");
this.ID = 0;
this.LastName = this.FirstMidName = string.Empty;
this.EnrollmentDate = DateTime.UtcNow;
//Application.Current.MainPage = new NavigationPage(new CoursesPage());
}
catch (Exception ex)
{
this.IsRunning = false;
this.IsEnabled = true;
await Application.Current.MainPage.DisplayAlert("Error", ex.Message, "Cancel");
}
}
