public static string NumberToString(string format, NumberStore ns, NumberFormatInfo nfi, char specifier, int precision, bool custom)
{
if (ns.IsNaN)
{
return nfi.NaNSymbol;
}
if (ns.IsInfinity)
{
if (ns.Positive)
return nfi.PositiveInfinitySymbol;
else
return nfi.NegativeInfinitySymbol;
}
if (nfi == null)
nfi = NumberFormatInfo.GetInstance(null);
if (custom)
{
if (ns.IsFloatingSource)
ns.RoundEffectiveDigits(ns.DefaultPrecision);
return FormatCustom(format, ns, nfi);
}
if (ns.IsFloatingSource)
{
switch (specifier)
{
case 'p':
case 'P':
case 'c':
case 'C':
case 'f':
case 'F':
case 'N':
case 'n':
ns.RoundEffectiveDigits(ns.DefaultPrecision);
break;
case 'g':
case 'G':
if (precision <= 0)
ns.RoundEffectiveDigits(ns.DefaultPrecision, ns.IsBankerApplicable, true);
else
ns.RoundEffectiveDigits(precision);
break;
case 'r':
case 'R':
ns.RoundEffectiveDigits(ns.DefaultMaxPrecision);
break;
default:
if (precision > ns.DefaultPrecision)
ns.RoundEffectiveDigits(precision + 1);
else
ns.RoundEffectiveDigits(ns.DefaultPrecision + 1);
break;
}
}
switch (specifier)
{
case 'c':
case 'C':
return FormatCurrency(ns, precision, nfi);
case 'd':
case 'D':
return FormatDecimal(ns, precision, nfi);
case 'e':
case 'E':
return FormatExponential(ns, precision, nfi, specifier == 'E');
case 'f':
case 'F':
return FormatFixedPoint(ns, precision, nfi);
case 'g':
case 'G':
if (ns.IsFloatingSource || ns.IsDecimalSource || precision != -1)
return FormatGeneral(ns, precision, nfi, specifier == 'G', false);
return FormatDecimal(ns, precision, nfi);
case 'n':
case 'N':
return FormatNumber(ns, precision, nfi);
case 'p':
case 'P':
return FormatPercent(ns, precision, nfi);
case 'r':
case 'R':
if (ns.IsFloatingSource)
{
return FormatGeneral(ns, ns.DefaultPrecision, nfi, true, true);
}
else
{
throw new FormatException("The specified format cannot be used in this instance");
}
default:
throw new FormatException("The specified format '" + format + "' is invalid");
}
}
