public decimal GetRate(Currency currFrom, Currency currTo)
{
if (currFrom == currTo)
{
return(1m);
}
TimeSpan difference = DateTime.Now - _updateTime;
if (difference >= _updateDifference)
{
UpdateRate(currFrom);
}
foreach (Rate c in _rates)
{
if (c.Curr1 == currFrom && c.Curr2 == currTo)
{
return(c.Coefficient);
}
}
throw new InvalidOperationException(ExceptionMessages.ExchangeRatesNoFittedRate());
}
