public async Task <ICollection <Rate> > GetRatesAsync()
{
RatesJson rates = await GetRatesCore();
return(rates.Rates.Select(o => new Rate()
{
Currency = o.Code,
Value = rates.GetRate(o.Code)
}).ToList());
}
public async Task <decimal> GetRateAsync(string currency)
{
RatesJson rates = await GetRatesCore();
return(rates.GetRate(currency));
}