string 和 Hex之间的转换

Question

string转化为Hex,又从Hex转化为string，请高手给下具体的代码。万分感谢

Answer 1

string 为 字母和数字  无汉字

Answer 2

        /// <summary>
        /// Hexbin 二进制数据用ASCII字符表示  例 字符'1'的hex是0x31表示为hexbin是 '3''1' 
        /// Hex: 二进制数据
         /// </summary>
        public static byte[] Hexbin2Hex(string Input)
        {
            byte[] bHexbin = Encoding.ASCII.GetBytes(Input);
            int nLen = bHexbin.Length / 2;
            byte[] bHex = new byte[nLen];            for (int i = 0; i < nLen; i++)
            {
                if (bHexbin[2 * i] < 0x41)
                {
                    bHex[i] = Convert.ToByte(((bHexbin[2 * i] - 0x30) << 4) & 0xf0);
                }
                else
                {
                    bHex[i] = Convert.ToByte(((bHexbin[2 * i] - 0x37) << 4) & 0xf0);
                }                if (bHexbin[2 * i + 1] < 0x41)
                {
                    bHex[i] |= Convert.ToByte((bHexbin[2 * i + 1] - 0x30) & 0x0f);
                }
                else
                {
                    bHex[i] |= Convert.ToByte((bHexbin[2 * i + 1] - 0x37) & 0x0f);
                }
            }            return bHex;
        }        /// <summary>
        /// 上一函数的逆过程
        /// </summary> 
        public static void Hex2Hexbin(byte[] bHex, byte[] bHexbin, int nLen)
        {
            byte c;
            for (int i = 0; i < nLen; i++)
            {
                c = Convert.ToByte((bHex[i] >> 4) & 0x0f);
                if (c < 0x0a)
                {
                    bHexbin[2 * i] = Convert.ToByte(c + 0x30);
                }
                else
                {
                    bHexbin[2 * i] = Convert.ToByte(c + 0x37);
                }
                c = Convert.ToByte(bHex[i] & 0x0f);
                if (c < 0x0a)
                {
                    bHexbin[2 * i + 1] = Convert.ToByte(c + 0x30);
                }
                else
                {
                    bHexbin[2 * i + 1] = Convert.ToByte(c + 0x37);
                }
            }
        }

Answer 3

private static byte[] strToToHexByte(string hexString)
        {
            hexString = hexString.Replace(" ", "");
            if ((hexString.Length % 2) != 0)
                hexString += " ";
            byte[] returnBytes = new byte[hexString.Length / 2];
            for (int i = 0; i < returnBytes.Length; i++)
                returnBytes[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);
            return returnBytes;
        }

Answer 4

            String str = "A5";            Int64 i = Convert.ToInt64(str, 16);
            Console.WriteLine(Convert.ToString(i,16));