public Money?To(CurrencyIsoCode to)
{
Money? converted = null;
ExchangeRate rate;
if (_provider.TryGet(_from.CurrencyCode, to, out rate))
{
converted = rate.Apply(_from);
}
return(converted);
}
/// <summary>
/// Try to get the exchange rate SOURCE->TARGET
/// </summary>
/// <param name="exchangeRates">The exchange rates</param>
/// <param name="sourceCurrency">The currency to convert from</param>
/// <param name="targetCurrency">The currency to convert to</param>
/// <returns>Either the exchange rate, or an exception</returns>
/// <exception cref="KeyNotFoundException"/>
public static ExchangeRate Get(this IExchangeRateProvider exchangeRates, Currency sourceCurrency, Currency targetCurrency)
{
if (exchangeRates == null)
{
throw new ArgumentNullException(nameof(exchangeRates));
}
return
(exchangeRates.TryGet(sourceCurrency, targetCurrency) ??
throw new KeyNotFoundException(Resources.ExchangeRates_CannotFindExchangeRateForCurrencies));
}
/// <summary>
/// Convert the amount into a different currency
/// </summary>
/// <param name="exchangeRates">The exchange rates</param>
/// <param name="amount">The amount to convert</param>
/// <param name="targetCurrency">The currency to convert to</param>
/// <returns>The converted currency</returns>
public static Money?TryConvert(this IExchangeRateProvider exchangeRates, Money amount, Currency targetCurrency)
{
if (exchangeRates == null)
{
throw new ArgumentNullException(nameof(exchangeRates));
}
var rate = exchangeRates.TryGet(amount.Currency, targetCurrency);
if (rate == null)
{
return(null);
}
return(amount * rate);
}
/// <summary>
/// Try to get the exchange rate SOURCE->TARGET
/// </summary>
/// <param name="sourceCurrency">The currency to convert from</param>
/// <param name="targetCurrency">The currency to convert to</param>
/// <returns>Either the exchange rate, or an exception</returns>
public ExchangeRate TryGet(Currency sourceCurrency, Currency targetCurrency)
{
return
(_rates.TryGet(sourceCurrency, targetCurrency) ??
_rates.TryGet(targetCurrency, sourceCurrency));
}
/// <inheritdoc/>
public ExchangeRate TryGet(Currency source, Currency target)
{
var key = Tuple.Create(source, target);
return(_rates.GetOrAdd(key, key => _provider.TryGet(key.Item1, key.Item2)));
}