C# 十进制与十六进制互转

1.从十六进制转换为十进制

    /// <summary>
        /// 十六进制转换到十进制
        /// </summary>
        /// <param name="hex"></param>
        /// <returns></returns>
        public static string Hex2Ten(string hex)
        {
            int ten = ;
            for (int i = , j = hex.Length - ; i < hex.Length; i++)
            {
                ten += HexChar2Value(hex.Substring(i, )) * ((int)Math.Pow(, j));
                j--;
            }
            return ten.ToString();
        }

        public static int HexChar2Value(string hexChar)
        {
            switch (hexChar)
            {
                case "":
                case "":
                case "":
                case "":
                case "":
                case "":
                case "":
                case "":
                case "":
                case "":
                    return Convert.ToInt32(hexChar);
                case "a":
                case "A":
                    return ;
                case "b":
                case "B":
                    return ;
                case "c":
                case "C":
                    return ;
                case "d":
                case "D":
                    return ;
                case "e":
                case "E":
                    return ;
                case "f":
                case "F":
                    return ;
                default:
                    return ;
            }
        }

this.txtStartShi.Text = Hex2Ten(this.txtStartSN.Text.Trim().Substring(, ));
this.txtEndShi.Text = Hex2Ten(this.txtEndSN.Text.Trim().Substring(, ));

2.从十进制转换为十六进制

        /// <summary>
        /// 从十进制转换到十六进制
        /// </summary>
        /// <param name="ten"></param>
        /// <returns></returns>
        public static string Ten2Hex(string ten)
        {
            ulong tenValue = Convert.ToUInt64(ten);
            ulong divValue, resValue;
            string hex = "";
            do
            {
                //divValue = (ulong)Math.Floor(tenValue / 16);

                divValue = (ulong)Math.Floor((decimal)(tenValue / ));

                resValue = tenValue % ;
                hex = tenValue2Char(resValue) + hex;
                tenValue = divValue;
            }
            while (tenValue >= );
            if (tenValue != )
                hex = tenValue2Char(tenValue) + hex;
            return hex;
        }

        public static string tenValue2Char(ulong ten)
        {
            switch (ten)
            {
                case :
                case :
                case :
                case :
                case :
                case :
                case :
                case :
                case :
                case :
                    return ten.ToString();
                case :
                    return "A";
                case :
                    return "B";
                case :
                    return "C";
                case :
                    return "D";
                case :
                    return "E";
                case :
                    return "F";
                default:
                    return "";
            }
        }

 int StartSN = Convert.ToInt32(this.txtStartShi.Text.Trim());
int EndSN = Convert.ToInt32(this.txtEndShi.Text.Trim());

  for (int i = ; i < EndSN - StartSN + ; i++)
  {
    listBox1.Items.Add("" + Ten2Hex((Convert.ToDouble(this.txtStartShi.Text) + i).ToString()));
  }

    /// <summary>
        /// 10进制转34进制
        /// </summary>
        /// <param name="parameter"></param>
        /// <returns></returns>
        public static string Ten2ThirtyFour(int parameter)
        {
            string[] radix = { "", "", "", "", "", "", "", "", "", "", "A", "B", "C", "D",
                                 "E", "F", "G", "H", "J", "K", "L", "M", "N", "P", "Q", "R", "S", "T",
                                 "U", "V", "W", "X", "Y", "Z" };
            string result = "";
            int len = ;
            int remainder = ;
            len = parameter / ;
            remainder = parameter % ;
            result = radix[remainder];
            while (len > )
            {
                remainder = len % ;
                len = len / ;
                result = radix[remainder] + result;
            }
            return result;
        }