async Task GetInstructors()
{
try
{
this.IsRefreshing = true;
var connection = await InstructorService.CheckConnection();
if (!connection)
{
this.IsRefreshing = false;
await Application.Current.MainPage.DisplayAlert("Error", "No internet connection", "Cancel");
return;
}
var listInstructors = ((await InstructorService.GetAll(Endpoints.GET_Instructors)).Select(x => ToInstructorItemViewModel(x))).OrderByDescending(x => x.FirstMidName);
this.AllInstructors = listInstructors.ToList();
this.Instructors = new ObservableCollection <InstructorItemViewModel>(listInstructors);
this.IsRefreshing = false;
}
catch (Exception ex)
{
this.IsRefreshing = false;
await Application.Current.MainPage.DisplayAlert("Error", ex.Message, "Cancel");
}
}
async Task DeleteInstructor()
{
var answer = await Application.Current.MainPage.DisplayAlert("Confirm", "Delete Confirm", "Yes", "No");
if (!answer)
{
return;
}
var connection = await instructorService.CheckConnection();
if (!connection)
{
await Application.Current.MainPage.DisplayAlert("Error", "No internet connection", "Cancel");
return;
}
await instructorService.Delete(EndPoints.DELETE_INSTRUCTORS, this.ID);
await Application.Current.MainPage.DisplayAlert("Message", "The process is successful", "Cancel");
var instructorViewModel = InstructorsViewModel.GetInstance();
var instructorDeleted = instructorViewModel.AllInstructors.FirstOrDefault(x => x.ID == this.ID);
instructorViewModel.AllInstructors.Remove(instructorDeleted);
instructorViewModel.GetInstructorsByFullName();
}
async Task EditInstructor()
{
try
{
if (string.IsNullOrEmpty(this.Instructor.LastName))
{
await Application.Current.MainPage.DisplayAlert("Error", "You must enter the field LastName", "Cancel");
return;
}
this.IsRunning = true;
this.IsEnabled = false;
var connection = await instructorService.CheckConnection();
if (!connection)
{
this.IsRunning = false;
this.IsEnabled = true;
await Application.Current.MainPage.DisplayAlert("Error", "No internet connection", "Cancel");
return;
}
var instructorDTO = new InstructorDTO {
ID = this.Instructor.ID, LastName = this.Instructor.LastName, FirstMidName = this.Instructor.FirstMidName, HireDate = this.Instructor.HireDate
};
await instructorService.Update(Endpoints.PUT_INSTRUCTORS, this.Instructor.ID, instructorDTO);
this.IsRunning = false;
this.IsEnabled = true;
await Application.Current.MainPage.DisplayAlert("Message", "The process is successful", "Cancel");
this.Instructor.ID = this.Instructor.ID = 0;
this.Instructor.LastName = string.Empty;
this.Instructor.FirstMidName = string.Empty;
this.Instructor.HireDate = 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 CreateInstructor()
{
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 instructorService.CheckConnection();
if (!connection)
{
this.IsRunning = false;
this.IsEnabled = true;
await Application.Current.MainPage.DisplayAlert("Error", "No internet connection", "Cancel");
return;
}
var instructorDTO = new InstructorDTO {
LastName = this.LastName, FirstMidName = this.FirstMidName, HireDate = this.HireDate
};
await instructorService.Create(Endpoints.POST_Instructor, instructorDTO);
this.IsRunning = false;
this.IsEnabled = true;
await Application.Current.MainPage.DisplayAlert("Message", "The process is successful", "Cancel");
this.InstructorID = 0;
this.LastName = this.FirstMidName = string.Empty;
//this.HireDate = DateTime.Now;
//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");
}
}