public async Task <ObservableCollection <Planet> > GetAllPlanetsAsync(bool refresh = false)
{
if (refresh)
{
_currentPlanets.Clear();
await LoadDataAndSaveFileAsync();
}
else if (!_currentPlanets.HasItems())
{
var file = await _localStorageService.ReadStringFromStorageAsync("planets");
if (file.IsNeitherNullNorEmpty())
{
var planets = JsonConvert.DeserializeObject <ObservableCollection <Planet> >(file);
_currentPlanets.AddRange(planets);
}
else
{
await LoadDataAndSaveFileAsync();
}
}
return(_currentPlanets);
}