private decimal[] GetY(DateTime fromDateInput, DateTime toDateInput, int[] xValues, string fromCurrency, string toCurrency)
{
IList <decimal> yValues = new List <decimal>();
IDictionary <int, DateTime> dates = CreateDateSet(fromDateInput, toDateInput);
foreach (int xValue in xValues)
{
ExchangeRate exhangeRate = _reader.Read(dates[xValue], fromCurrency);
if (!exhangeRate.rates.ContainsKey(toCurrency))
{
throw new ArgumentException($"Currency code {toCurrency} is invalid.");
}
decimal yValue = Decimal.Parse(exhangeRate.rates[toCurrency].ToString());
yValues.Add(yValue);
}
return(yValues.ToArray());
}
