public static String FormatDecimal(Decimal value, String format, IFormatProvider provider)
{
NumberFormatInfo info = provider == null ? NumberFormatInfo.CurrentInfo : NumberFormatInfo.GetInstance(provider);
NumberBuffer number = new NumberBuffer();
DecimalToNumber(value, ref number);
int digits;
char fmt = ParseFormatSpecifier(format, out digits);
ValueStringBuilder sb;
unsafe
{
char *stackPtr = stackalloc char[CharStackBufferSize];
sb = new ValueStringBuilder(new Span <char>(stackPtr, CharStackBufferSize));
}
if (fmt != 0)
{
NumberToString(ref sb, ref number, fmt, digits, info, true);
}
else
{
NumberToStringFormat(ref sb, ref number, format, info);
}
return(sb.GetString());
}
public static String FormatSingle(float value, String format, IFormatProvider provider)
{
NumberFormatInfo info = provider == null ? NumberFormatInfo.CurrentInfo : NumberFormatInfo.GetInstance(provider);
ValueStringBuilder sb;
unsafe
{
char *stackPtr = stackalloc char[CharStackBufferSize];
sb = new ValueStringBuilder(new Span <char>(stackPtr, CharStackBufferSize));
}
int digits;
char fmt = ParseFormatSpecifier(format, out digits);
int precision = FLOAT_PRECISION;
NumberBuffer number = new NumberBuffer();
switch (fmt)
{
case 'R':
case 'r':
{
// In order to give numbers that are both friendly to display and round-trippable, we parse
// the number using 7 digits and then determine if it round trips to the same value. If it
// does, we convert that NUMBER to a string, otherwise we reparse using 9 digits and display
// that.
DoubleToNumber(value, FLOAT_PRECISION, ref number);
if (number.scale == SCALE_NAN)
{
return(info.NaNSymbol);
}
if (number.scale == SCALE_INF)
{
return(number.sign ? info.NegativeInfinitySymbol : info.PositiveInfinitySymbol);
}
if ((float)NumberToDouble(ref number) == value)
{
NumberToString(ref sb, ref number, 'G', FLOAT_PRECISION, info, false);
}
else
{
DoubleToNumber(value, 9, ref number);
NumberToString(ref sb, ref number, 'G', 9, info, false);
}
return(sb.GetString());
}
case 'E':
case 'e':
// Here we round values less than E14 to 15 digits
if (digits > 6)
{
precision = 9;
}
break;
case 'G':
case 'g':
// Here we round values less than G15 to 15 digits, G16 and G17 will not be touched
if (digits > 7)
{
precision = 9;
}
break;
}
DoubleToNumber(value, precision, ref number);
if (number.scale == SCALE_NAN)
{
return(info.NaNSymbol);
}
if (number.scale == SCALE_INF)
{
return(number.sign ? info.NegativeInfinitySymbol : info.PositiveInfinitySymbol);
}
if (fmt != 0)
{
NumberToString(ref sb, ref number, fmt, digits, info, false);
}
else
{
NumberToStringFormat(ref sb, ref number, format, info);
}
return(sb.GetString());
}
