/// <summary>
/// Converts <paramref name="amountToConvert">amountToConvert</paramref> to the base currency.
/// </summary>
/// <param name="amountToConvert">Amount to convert accounted in <paramref name="currency" />.</param>
/// <param name="currency">ISO 4217 code for the currency that the <paramref name="amountToConvert" />
/// is accounted in.</param>
/// <param name="currencyRate">Currency rate with respect to the <paramref name="baseCurrency" />
/// for the currency that the <paramref name="amountToConvert" /> is accounted in.</param>
/// <param name="baseCurrency">Base currency identified by ISO 4217 code.</param>
/// <param name="amountSignificantDigits">Round order applied to the result.</param>
/// <param name="currencyRateSignificantDigits">Round order applied to <paramref name="currencyRate" />.</param>
/// <exception cref="ArgumentException">Parameters currencyRate, amountSignificantDigits
/// and currencyRateSignificantDigits cannot be negative.</exception>
/// <remarks>amountToConvert value in baseCurrency units</remarks>
public static decimal ToBaseCurrency(this decimal amountToConvert, string currency,
decimal currencyRate, string baseCurrency, int amountSignificantDigits = DefaultAmountSignificantDigits,
int currencyRateSignificantDigits = DefaultCurrencyRateSignificantDigits)
{
if (currencyRate < 0.0m)
{
throw new ArgumentException(string.Format(Properties.Resources.ParameterCannotBeNegative,
nameof(currencyRate)), nameof(currencyRate));
}
if (amountSignificantDigits < 0)
{
throw new ArgumentException(string.Format(Properties.Resources.ParameterCannotBeNegative,
nameof(amountSignificantDigits)), nameof(amountSignificantDigits));
}
if (currencyRateSignificantDigits < 0)
{
throw new ArgumentException(string.Format(Properties.Resources.ParameterCannotBeNegative,
nameof(currencyRateSignificantDigits)), nameof(currencyRateSignificantDigits));
}
if (currency.IsBaseCurrency(baseCurrency))
{
return(amountToConvert.AccountingRound(amountSignificantDigits));
}
decimal validatedCurrencyRate = currencyRate.AccountingRound(currencyRateSignificantDigits);
decimal validatedAmount = amountToConvert.AccountingRound(amountSignificantDigits);
return((validatedAmount * validatedCurrencyRate).AccountingRound(amountSignificantDigits));
}
/// <summary>
/// Converts <paramref name="amountToConvert" /> accounted in currency <paramref name="originalCurrency" />
/// with conversion rate <paramref name="originalCurrencyRate" /> with respect to <paramref name="baseCurrency" />
/// to amount accounted in currency <paramref name="targetCurrency" /> with conversion rate
/// <paramref name="targetCurrencyRate" /> with respect to <paramref name="baseCurrency" />.
/// </summary>
/// <param name="amountToConvert">Amount to convert accounted in <paramref name="originalCurrency" />.</param>
/// <param name="originalCurrency">ISO 4217 code for the currency that the <paramref name="amountToConvert" /> is accounted in.</param>
/// <param name="originalCurrencyRate">Currency rate with respect to the <paramref name="baseCurrency" />
/// for the currency that the <paramref name="amountToConvert" /> is accounted in. (should be zero or positive)</param>
/// <param name="targetCurrency">ISO 4217 code for the currency that the returned value is accounted in.</param>
/// <param name="targetCurrencyRate">Currency rate with respect to the <paramref name="baseCurrency" />
/// for the currency that the returned value is accounted in.(should be zero or positive)</param>
/// <param name="baseCurrency">Base currency identified by ISO 4217 code.</param>
/// <param name="amountSignificantDigits">Round order applied to the result.</param>
/// <param name="currencyRateSignificantDigits">Round order applied to <paramref name="originalCurrencyRate" />
/// and <paramref name="targetCurrencyRate" />.</param>
/// <param name="defaultAmount">Return value in case a conversion is not possible,
/// e.g. <paramref name="targetCurrencyRate" /> is zero.</param>
/// <returns><paramref name="amountToConvert" /> converted to <paramref name="targetCurrency" />.</returns>
/// <returns>amountToConvert value in targetCurrency units</returns>
/// <exception cref="ArgumentException">Parameters originalCurrencyRate, targetCurrencyRate,
/// amountSignificantDigits and currencyRateSignificantDigits cannot be negative.</exception>
public static decimal ToCurrency(this decimal amountToConvert, string originalCurrency,
decimal originalCurrencyRate, string targetCurrency, decimal targetCurrencyRate,
string baseCurrency, int amountSignificantDigits = DefaultAmountSignificantDigits,
int currencyRateSignificantDigits = DefaultCurrencyRateSignificantDigits,
decimal defaultAmount = DefaultAmountDecimal)
{
if (originalCurrencyRate < 0.0m)
{
throw new ArgumentException(string.Format(Properties.Resources.ParameterCannotBeNegative,
nameof(originalCurrencyRate)), nameof(originalCurrencyRate));
}
if (targetCurrencyRate < 0.0m)
{
throw new ArgumentException(string.Format(Properties.Resources.ParameterCannotBeNegative,
nameof(targetCurrencyRate)), nameof(targetCurrencyRate));
}
if (amountSignificantDigits < 0)
{
throw new ArgumentException(string.Format(Properties.Resources.ParameterCannotBeNegative,
nameof(amountSignificantDigits)), nameof(amountSignificantDigits));
}
if (currencyRateSignificantDigits < 0)
{
throw new ArgumentException(string.Format(Properties.Resources.ParameterCannotBeNegative,
nameof(currencyRateSignificantDigits)), nameof(currencyRateSignificantDigits));
}
// zero remains zero in any currency
if (amountToConvert.AccountingRound(amountSignificantDigits) == 0.0m)
{
return(0);
}
// if the currencies are the same, amount is the same
if (originalCurrency.IsSameCurrency(targetCurrency, baseCurrency))
{
return(amountToConvert.AccountingRound(amountSignificantDigits));
}
// base currency rate with respect to itself is always 1
decimal validatedOriginalCurrencyRate = originalCurrencyRate;
if (originalCurrency.IsBaseCurrency(baseCurrency))
{
validatedOriginalCurrencyRate = 1.0m;
}
decimal validatedTargetCurrencyRate = targetCurrencyRate;
if (targetCurrency.IsBaseCurrency(baseCurrency))
{
validatedTargetCurrencyRate = 1.0m;
}
// apply currencyRateSignificantDigits
validatedOriginalCurrencyRate = validatedOriginalCurrencyRate.AccountingRound(currencyRateSignificantDigits);
validatedTargetCurrencyRate = validatedTargetCurrencyRate.AccountingRound(currencyRateSignificantDigits);
// do calculus if possible
if (validatedTargetCurrencyRate.AccountingRound(currencyRateSignificantDigits) > 0.0m)
{
return(((amountToConvert * validatedOriginalCurrencyRate).AccountingRound(amountSignificantDigits)
/ validatedTargetCurrencyRate).AccountingRound(amountSignificantDigits));
}
return(defaultAmount.AccountingRound(amountSignificantDigits));
}
/// <summary>
/// Gets a string that represents the value formated by the ffdata standarts.
/// </summary>
/// <param name="value">number to format</param>
public static string ToFFDataFormat(this decimal value)
{
return(value.AccountingRound(2).ToString("#.00", CultureInfo.InvariantCulture));
}