public async void Add()
{
var task = new TaskTodoVM(); // create new view model of a task
string userInput = await InputTextDialogAsync("New Task"); // call a method that represents dialog with a user
// obtain result of an input
if (userInput.Length == 0) /* do nothing */ } {
// Constructor
public TodoCollectionVM()
{
// Create new Model that you want to wrap in View Model
// Model can have a data already in it or may call http services to obtain it
Debug.WriteLine("Constructing VM");
todoCollection = new TodoCollection();
myGeoService = new GeoLocationService(); // create instance of Geo Service
myGeoService.initialiseGeoLocation(); // initialise service, ask user for access
Debug.WriteLine(myGeoService.Geo_status);
_SelectedIndex = -1; // Set selected index in ListView to nothing.
// This property has x:Bind to it's getter in ListView on Page
// Loop over collection in Model and add each Todo task from it to a ViewModel (ObservableCollection)
foreach (var task in todoCollection.TodoList)
{
var nt = new TaskTodoVM(task); // Note that ObservableCollection _TodoList
// takes objects of type TaskTodoVM that is wrapping
// POCO Model for Task on the List.
// nt.PropertyChanged += Task_OnNotifyPropertyChanged; //
_TodoList.Add(nt);
}
}