十进制转化为十六进制

 public static string tenToSixteen(int? code, int width)
        {
            int amount = (int)code;
            string current = "";
            string codes = "0123456789ABCDEF"; // 设置16进制转换编码表
            do
            {
                int nextDigit = amount % 16;
                amount /= 16;
                current = codes.Substring(nextDigit, 1) + current;

            } while (amount != 0);

            if (width <= current.Length)
            {
                return current;
            }

            var delta = width - current.Length;
            var padding = "";
            while (delta-- > 0)
            {
                padding += "0";

            }

            return padding + current;
        }