/// <summary>
/// Convert the amount in the currency to the other currency. This allows to convert the amount even when
/// the rate is reversed.
/// </summary>
/// <param name="amount">The amount to be converted</param>
/// <param name="currency">The currency of the amount. Note that when the currency given is not one of the
/// two currencies in the exchane rate an exception will be thrown.</param>
/// <returns>The converted amount</returns>
public decimal Convert(decimal amount, Currency currency)
{
if (currency == null)
{
throw new ArgumentNullException(nameof(currency));
}
if (currency.Equals(From))
{
return(amount * this);
}
else if (currency.Equals(To))
{
return(amount / this);
}
else
{
throw new ArgumentOutOfRangeException(nameof(currency));
}
}
/// <summary>
/// Create an exchange rate for the given currencies. 1 FROM = <rate> TO
/// </summary>
/// <param name="from">the currency that will be used to convert a money amount from</param>
/// <param name="to">the currency that will be used to convert a money amount to</param>
/// <param name="rate">The actual rate to convert the currencies. 1 FROM = <rate> TO</param>
/// <exception cref="ArgumentNullException">The <paramref name="from"/> or <paramref name="to"/> currency is <c>null</c></exception>
/// <exception cref="ArgumentOutOfRangeException">The <paramref name="rate"/>is non-positive</exception>
/// <exception cref="ArgumentException">The <paramref name="from"/> is equal to <paramref name="to"/></exception>
public ExchangeRate(Currency from, Currency to, decimal rate)
{
if (from == null)
{
throw new ArgumentNullException(nameof(from));
}
if (to == null)
{
throw new ArgumentNullException(nameof(to));
}
if (from.Equals(to))
{
throw new ArgumentException(Resources.ExchangeRate_SameCurrency);
}
if (rate <= 0)
{
throw new ArgumentOutOfRangeException(nameof(rate));
}
From = from;
To = to;
Rate = rate;
}
