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public static double Round(double value, int digits)
{
if (digits < 0 || digits > 15)
{
throw new ArgumentOutOfRangeException("digits", Environment.GetResourceString("ArgumentOutOfRange_RoundingDigits"));
}
return Math.InternalRound(value, digits, MidpointRounding.ToEven);
}
private unsafe static double InternalRound(double value, int digits, MidpointRounding mode)
{
if (Math.Abs(value) < Math.doubleRoundLimit)
{
double num = Math.roundPower10Double[digits];
value *= num;
if (mode == MidpointRounding.AwayFromZero)
{
double value2 = Math.SplitFractionDouble(&value);
if (Math.Abs(value2) >= 0.5)
{
value += (double)Math.Sign(value2);
}
}
else
{
value = Math.Round(value);
}
value /= num;
}
return value;
}