/// <summary>
/// If the given value is of a numeric type, converts the value to a string representation
/// using the specified format and culture-specific format information. Returns empty if this value is not of a
/// numeric type.
/// </summary>
/// <param name="value"></param>
/// <param name="format"></param>
/// <param name="provider"></param>
/// <returns></returns>
public static Opt <string> NumericValueToStringOpt(this IConvertible value, string format, IFormatProvider provider)
{
switch (Classify(value))
{
case SimpleTypeClassification.Decimal:
{
return(Opt.Full(((decimal)value).ToString(format, provider)));
}
case SimpleTypeClassification.FloatingPoint:
{
return(value.FloatingPointValueOpt()
.Select(v => v.ToString(format, provider))
.SingleFixOpt());
}
case SimpleTypeClassification.SignedIntegral:
{
return(value.SignedIntegralValueOpt()
.Select(v => v.ToString(format, provider))
.SingleFixOpt());
}
case SimpleTypeClassification.UnsignedIntegral:
{
return(value.UnsignedIntegralValueOpt()
.Select(v => v.ToString(format, provider))
.SingleFixOpt());
}
default:
return(Opt.Empty <string>());
}
}
/// <summary>
/// If the specified value is of any numeric type, retrieves the value as a <c>decimal</c>,
/// casting if necessary.
/// <para>The result is empty if the specified value is not of a numeric type.</para>
/// </summary>
/// <param name="value"></param>
/// <returns></returns>
public static Opt <decimal> NumericValueAsDecimalOpt(this IConvertible value)
{
switch (Classify(value))
{
case SimpleTypeClassification.Decimal:
{
return(value.DecimalValueOpt());
}
case SimpleTypeClassification.FloatingPoint:
{
return(value
.FloatingPointValueOpt()
.SelectFix(doubleValue => (decimal)doubleValue));
}
case SimpleTypeClassification.SignedIntegral:
{
return(value
.SignedIntegralValueOpt()
.SelectFix(longValue => (decimal)longValue));
}
case SimpleTypeClassification.UnsignedIntegral:
{
return(value
.UnsignedIntegralValueOpt()
.SelectFix(ulongValue => (decimal)ulongValue));
}
default:
return(Opt.Empty <decimal>());
}
}