static bool PerformParse(string s, NumberStyles style, IFormatProvider provider, out Decimal res, bool throwex)
{
var nfi = provider.ToNumberFormatInfo();
try
{
int decPos;
bool isNegative;
bool expFlag;
int exp;
var stripped = StripStyles(s, style, nfi, out decPos, out isNegative, out expFlag, out exp, throwex);
var b = new BigDecimal(stripped)
.MovePointLeft(stripped.Length - decPos)
.ScaleByPowerOfTen(exp);
if (isNegative)
{
b = b.Negate();
}
res = b;
return(true);
}
catch (Exception)
{
if (throwex)
{
throw;
}
res = default(decimal);
return(false);
}
}
public string ToString(string format, IFormatProvider provider)
{
var ni = provider.ToNumberFormatInfo();
string s;
var val = Val.Abs();
bool group = false;
string decimalDigit = ni.NumberDecimalSeparator;
string groupingDigit = null;
int[] groupingSize = null;
bool covertEToLower = false;
char formatChar = 'G';
if (string.IsNullOrEmpty(format))
{
s = val.ToString();
}
else
{
formatChar = format[0];
covertEToLower = !char.IsUpper(formatChar);
formatChar = char.ToUpperInvariant(formatChar);
int len;
if (!int.TryParse(format.Substring(1), out len))
{
len = -1;
}
switch (formatChar)
{
case 'E':
s = val.SetScale(len == -1 ? 6 : len, RoundingMode.HALF_UP)
.ToEngineeringString();
break;
case 'C':
s = val.SetScale(len == -1 ? ni.CurrencyDecimalDigits : len, RoundingMode.HALF_UP)
.ToPlainString();
group = true;
decimalDigit = ni.CurrencyDecimalSeparator;
groupingDigit = ni.CurrencyGroupSeparator;
groupingSize = ni.CurrencyGroupSizes;
break;
case 'N':
s = val.SetScale(len == -1 ? ni.NumberDecimalDigits : len, RoundingMode.HALF_UP)
.ToPlainString();
group = true;
decimalDigit = ni.NumberDecimalSeparator;
groupingDigit = ni.NumberGroupSeparator;
groupingSize = ni.NumberGroupSizes;
break;
case 'F':
s = val.SetScale(len == -1 ? ni.NumberDecimalDigits : len, RoundingMode.HALF_UP)
.ToPlainString();
break;
case 'G':
s = ((len == -1) ? val : val.SetScale(ni.NumberDecimalDigits, RoundingMode.HALF_UP))
.ToString();
break;
case 'P':
s =
val.Multiply(new BigDecimal(100))
.SetScale(len == -1 ? ni.PercentDecimalDigits : len, RoundingMode.HALF_UP)
.ToString();
group = true;
decimalDigit = ni.PercentDecimalSeparator;
groupingDigit = ni.PercentGroupSeparator;
groupingSize = ni.PercentGroupSizes;
break;
default:
// TODO: support custom formats.
throw new NotImplementedException("format: " + format);
}
}
StringBuilder b = new StringBuilder(s.Length + 10);
if (this < Zero)
{
b.Append(ni.NegativeSign);
}
if (decimalDigit != ".")
{
s = s.Replace(".", decimalDigit);
}
if (group)
{
// todo: find the decimal separator, split the string and assemble everything again.
}
if (covertEToLower)
{
s = s.Replace('E', 'e');
}
b.Append(s);
if (formatChar == 'P')
{
b.Append(" ");
b.Append(ni.PercentSymbol);
}
else if (formatChar == 'C')
{
b.Append(" ");
b.Append(ni.CurrencySymbol);
}
return(b.ToString());
}