public double Convert(String from, double amount, string to)
{
double fromRate = provider.GetExchangeRate(from);
double toRate = provider.GetExchangeRate(to);
return(amount * toRate / fromRate);
}
public async Task <decimal> Convert(decimal fromAmount, Currency fromCurrency, Currency toCurrency)
{
try
{
if (fromAmount <= 0)
{
throw new ArgumentOutOfRangeException(nameof(fromAmount), "Must be greater than zero.");
}
if (fromCurrency is null)
{
throw new ArgumentNullException(nameof(fromCurrency));
}
if (toCurrency is null)
{
throw new ArgumentNullException(nameof(toCurrency));
}
_logger.LogInformation($"Converting {fromAmount} {fromCurrency.Code} to {toCurrency.Code}.");
var fromToBaseAmount = fromAmount * await _exchangeRateProvider.GetExchangeRate(fromCurrency);
return(fromToBaseAmount / await _exchangeRateProvider.GetExchangeRate(toCurrency));
}
catch (Exception ex)
{
_logger.LogError(ex, $"Error while converting currency {fromAmount} of \"{fromCurrency}\" to \"{toCurrency}\"");
throw;
}
}