public async void Prueba()
{
weatherData3 = await _restService.GetWeatherData3Async();
ObservableCollection <ValueW> lista_noticias = new ObservableCollection <ValueW>(weatherData3);
get_webinar.ItemsSource = lista_noticias;
}
protected override async void OnAppearing()
{
if (weatherData3.Count < 1)
{
weatherData3 = await _restService.GetWeatherData3Async();
BindingContext = weatherData3;
OnAppearing();
}
}