十进制转化为十六进制

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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;        }