private async Task AddContact()
{
var viewModel = new ContactDetailPageViewModel(new Contact());
var page = new ContactDetailPage(viewModel);
await Subscribe_ContactDetail_Add(page, viewModel);
}
private async Task Subscribe_ContactDetail_Add(ContactDetailPage page, ContactDetailPageViewModel viewModel)
{
SelectedContact = null;
viewModel.ContactAdded += async(source, args) =>
{
bool isAdd = args.Id == 0;
if (isAdd)
{
Contacts.Add(args);
await _contactService.AddContact(args);
}
else
{
var existingContact = Contacts.Where(x => x.Id == args.Id).FirstOrDefault();
Contacts[Contacts.IndexOf(existingContact)] = args;
await _contactService.UpdateContact(args);
}
await _pageService.DisplayAlert("Add Contact",
string.Format("Contact has been {0}", (isAdd) ? "added" : "modified"),
"OK");
await _pageService.PopAsync();
};
await _pageService.PushAsync(page);
}
private async Task Contact_Selected(Contact contactSelected)
{
if (contactSelected == null)
{
return;
}
SelectedContact = contactSelected;
var viewModel = new ContactDetailPageViewModel(contactSelected);
var page = new ContactDetailPage(viewModel);
await Subscribe_ContactDetail_Add(page, viewModel);
}
