public Amount CommodityAmount(Commodity commodity = null)
{
if (commodity == null)
{
if (IsSingleAmount)
{
return(SingleAmount);
}
else if (!IsEmpty)
{
// Try stripping annotations before giving an error.
Balance balance = StripAnnotations(new AnnotationKeepDetails());
if (balance.IsSingleAmount)
{
return(balance.SingleAmount);
}
throw new AmountError(String.Format(AmountError.ErrorMessageRequestedAmountOfBalanceWithMultipleCommodities, balance));
}
}
else if (!IsEmpty)
{
Amount amount = null;
Amounts.TryGetValue(commodity, out amount);
return(amount);
}
return(null);
}