Calculate System.Decimal Precision and Scale

Question

Suppose that we have a System.Decimal number.

For illustration, let\'s take one whose ToString() representation is as follows:

d.ToString() = \"123.4         


        

Answer 1

public static class DecimalExtensions
{
    public static int GetPrecision(this decimal value)
    {
        return GetLeftNumberOfDigits(value) + GetRightNumberOfDigits(value);
    }

    public static int GetScale(this decimal value)
    {
        return GetRightNumberOfDigits(value);
    }
    /// 

    /// Number of digits to the right of the decimal point without ending zeros
    /// 
    /// 
    /// 
    public static int GetRightNumberOfDigits(this decimal value)
    {
        var text = value.ToString(System.Globalization.CultureInfo.InvariantCulture).TrimEnd('0');
        var decpoint = text.IndexOf(System.Globalization.CultureInfo.InvariantCulture.NumberFormat.NumberDecimalSeparator);
        if (decpoint < 0)
            return 0;
        return text.Length - decpoint - 1;
    }

    /// 

    /// Number of digits to the left of the decimal point without starting zeros
    /// 
    /// 
    /// 
    public static int GetLeftNumberOfDigits(this decimal value)
    {
        var text = Math.Abs(value).ToString(System.Globalization.CultureInfo.InvariantCulture).TrimStart('0');
        var decpoint = text.IndexOf(System.Globalization.CultureInfo.InvariantCulture.NumberFormat.NumberDecimalSeparator);
        if (decpoint == -1)
            return text.Length;
        return decpoint;
    }
}

My solution is compatible with Oracle precision and scale definition for NUMBER(p,s) DataType:

https://docs.oracle.com/cd/B28359_01/server.111/b28318/datatype.htm#i16209

Regards.