c# how to String.Format decimal with unlimited decimal places?

Question

I need to convert a decimal number to formatted string with thousand groups and unlimited (variable) decimal numbers:

    1234 -> \"1,234\"
    1234.567 -> \"1,2         


        

Answer 1

this should do the trick

string DecimalToDecimalsString(decimal input_num)
        {            
            decimal d_integer = Math.Truncate(input_num); // = 1234,0000...
            decimal d_decimals = input_num-d_integer; // = 0,5678...

            while (Math.Truncate(d_decimals) != d_decimals)
                d_decimals *= 10; //remove decimals

            string s_integer = String.Format("{0:#,#}", d_integer);
            string s_decimals = String.Format("{0:#}", d_decimals);

            return s_integer + "." + s_decimals;
        }

replacing decimal with other types should work too.