C# Check if a decimal has more than 3 decimal places?

Question

I have a situation that I cannot change: one database table (table A) accepts 6 decimal places, while a related column in a different table (table B) only has 3 decimal plac

Answer 1

You could compare the value of the number rounded to 3 decimal places with the original value.

if (Decimal.Round(valueDecimal, 3) != valueDecimal)
{
   //Too many decimals
}

Answer 2

    bool CountDecimalPlaces(decimal input)
    {
        return input*1000.0 == (int) (input*1000);
    }

Answer 3

This is a very simple one line code to get count of decimals in a Decimal:

decimal myDecimal = 1.000000021300010000001m;
byte decimals = (byte)((Decimal.GetBits(myDecimal)[3] >> 16) & 0x7F);

Answer 4

Public Function getDecimalCount(decWork As Decimal) As Integer

    Dim intDecimalCount As Int32 = 0
    Dim strDecAbs As String = decWork.ToString.Trim("0")

    intDecimalCount = strDecAbs.Substring(strDecAbs.IndexOf(".")).Length -1

    Return intDecimalCount

End Function

Answer 5

could you convert it to a string and just do a len function or would that not cover your situation?

follow up question: would 300.4 be ok?

Answer 6

There is probably a more elegant way to do this, but off the top of my head I would try

1. a = multiply by 1000
2. b = truncate a
3. if (b != a) then there is additional precision that has been lost