System.Number.StringToNumber C# (CSharp) Method

        private unsafe static void StringToNumber(String str, NumberStyles options, ref NumberBuffer number, NumberFormatInfo info, Boolean parseDecimal) {
    
            if (str == null) {
                throw new ArgumentNullException("String");
            }
            BCLDebug.Assert(info != null, "");
            fixed (char* stringPointer = str) {
                char * p = stringPointer;
                if (!ParseNumber(ref p, options, ref number, info , parseDecimal) 
                    || (p - stringPointer < str.Length && !TrailingZeros(str, (int)(p - stringPointer)))) {
                    throw new FormatException(Environment.GetResourceString("Format_InvalidString"));
                }
            }
        }
        

        internal static unsafe Decimal ParseDecimal(string value, NumberStyles options, NumberFormatInfo numfmt)
        {
            byte *stackBuffer = stackalloc byte[Number.NumberBuffer.NumberBufferBytes];

            Number.NumberBuffer number = new Number.NumberBuffer(stackBuffer);
            Decimal             num    = new Decimal();

            Number.StringToNumber(value, options, ref number, numfmt, true);
            if (!Number.NumberBufferToDecimal(number.PackForNative(), ref num))
            {
                throw new OverflowException(Environment.GetResourceString("Overflow_Decimal"));
            }
            return(num);
        }