private void UpdateData()
{
Task.Run(async() =>
{
CurrencyRatesResponse response;
var serializer = new JsonSerializer();
var pinnedRates = AppPropertiesHelper.GetPinnedRates();
try
{
using (var stream = await Client.GetStreamAsync(ratesUrl + Date.ToString("dd.MM.yyyy")))
using (var streamReader = new StreamReader(stream))
using (var json = new JsonTextReader(streamReader))
{
response = serializer.Deserialize <CurrencyRatesResponse>(json);
};
response.ExchangeRate.RemoveAll(p => string.IsNullOrEmpty(p.Currency) || p.Currency == "UAH");
foreach (var item in response.ExchangeRate)
{
if (pinnedRates.Contains(item.Currency))
{
item.Pinned = true;
}
}
var sortedRates = response.ExchangeRate.OrderByDescending(p => p.Pinned).ThenBy(d => pinnedRates.IndexOf(d.Currency)).ToList();
Rates = new ObservableCollection <ExchangeRate>(sortedRates);
SaveData();
}
catch (HttpRequestException)
{
Device.BeginInvokeOnMainThread(() =>
{
Application.Current.MainPage.DisplayAlert("Ошибка", "Нет подключения к Интернет", "Закрыть");
Application.Current.Properties.TryGetValue("rates", out object value);
if (value is ObservableCollection <ExchangeRate> savedRates)
{
Rates = new ObservableCollection <ExchangeRate>(savedRates);
}
});
}
catch (Exception e)
{
Device.BeginInvokeOnMainThread(() =>
{
Application.Current.MainPage.DisplayAlert("Ошибка", e.Message, "Закрыть");
});
}
});
}
private void PinRate(ExchangeRate obj)
{
IsRateIdle = false;
(PinRateCommand as Command)?.ChangeCanExecute();
obj.Pinned = !obj.Pinned;
AppPropertiesHelper.UpdatePinnedRates(obj);
var pinnedRates = AppPropertiesHelper.GetPinnedRates();
var sortedRates = Rates.OrderByDescending(p => p.Pinned).ThenBy(d => pinnedRates.IndexOf(d.Currency)).ToList();
Rates = new ObservableCollection <ExchangeRate>(sortedRates);
IsRateIdle = true;
(PinRateCommand as Command)?.ChangeCanExecute();
}
private void SaveData()
{
AppPropertiesHelper.Save("rates", JsonConvert.SerializeObject(Rates));
}