C# 汉字与区位码之间的相互转换（中文数字字母可以，支持空格，但是特殊字符未来得及测试）

using System;
using System.Text;

namespace Test
{
    class MainClass
    {
        /// <summary>
        /// 中文空白字符，用于替换空格
        /// </summary>
        private static string ChineseSpace = "　";

        public static void Main(string[] args)
        {
            string s = "你我是中国人 12 34 ABCabc";
            Console.WriteLine(s);
            s = ChineseToCoding(s);
            Console.WriteLine(s);
            s = CodingToChinese(s);
            Console.WriteLine(s);
            Console.ReadKey();
        }

        /// <summary>
        /// 汉字转区位码方法
        /// </summary>
        /// <param name="character">汉字</param>
        /// <returns>区位码</returns>
        public static string ChineseToCoding(string character)
        {
            string coding = string.Empty;

            //空格处理（如不用可以注释）
            character = character.Replace(" ", ChineseSpace);

            try
            {
                for (int i = 0; i < character.Length; i++)
                {
                    byte[] bytes = System.Text.Encoding.GetEncoding("GB2312").GetBytes(character.Substring(i, 1));
                    if (bytes.Length == 2)
                    {
                        string lowCode = System.Convert.ToString(bytes[0], 16);
                        if (lowCode.Length == 1)
                            lowCode = "0" + lowCode;
                        string hightCode = System.Convert.ToString(bytes[1], 16);
                        if (hightCode.Length == 1)
                            hightCode = "0" + hightCode;
                        coding += (lowCode + hightCode);
                    }
                    else
                    {
                        string lowCode = System.Convert.ToString(bytes[0], 16);
                        if (lowCode.Length == 1)
                            lowCode = "0" + lowCode;
                        coding += (lowCode);
                    }
                }
                return coding;
            }
            catch
            {
                return null;
            }
        }

        /// <summary>
        /// 区位码转汉字方法
        /// </summary>
        /// <param name="coding">区位码</param>
        /// <returns>汉字</returns>
        public static string CodingToChinese(string coding)
        {
            string characters = string.Empty;
            if (coding.Length % 4 != 0)//编码为16进制,必须为4的倍数。
            {
                throw new System.Exception("编码格式不正确");
            }
            for (int i = 0; i < coding.Length / 4; i++)
            {
                byte[] bytes = new byte[2];
                int j = i * 4;
                string lowCode = coding.Substring(j, 2); //取出低字节,并以16进制进制转换
                bytes[0] = System.Convert.ToByte(lowCode, 16);
                string highCode = coding.Substring(j + 2, 2); //取出高字节,并以16进制进行转换
                bytes[1] = System.Convert.ToByte(highCode, 16);
                string character = System.Text.Encoding.GetEncoding("GB2312").GetString(bytes);
                characters += character;
            }

            //空格复原（将中文空白字符转换普通空格）
            characters = characters.Replace(ChineseSpace, " ");

            return characters;
        }
    }
}