汉字及区位码之间的转换

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace Test
{
    public partial class HanZiQvWeiMaZhuanHuan : Form
    {
        public HanZiQvWeiMaZhuanHuan()
        {
            InitializeComponent();
        }

        public string CharacterToCoding(char c)
        {
            //使用GB2312编码
            Encoding gb = Encoding.GetEncoding("gb2312");
            //将汉字转换为字节
            byte[] bytes = gb.GetBytes(new char[] { c });
            //一个汉字对应2个字节，如果小于两个字节，则返回错误
            if (bytes == null || bytes.Length < 2)
                //return "Error";
                return Convert.ToString(c);
            //取出低字节编码内容（两位16进制）
            int nLowCode = Convert.ToInt32(Convert.ToString(bytes[0]), 10);
            string sLowCode = Convert.ToString(nLowCode - 160);
            if (sLowCode.Length == 1)
                sLowCode = "0" + sLowCode;
            //取出高字节编码内容（两位16进制）
            int nHighCode = Convert.ToInt32(Convert.ToString(bytes[1]), 10);
            string sHighCode = Convert.ToString(nHighCode - 160);
            if (sHighCode.Length == 1)
                sHighCode = "0" + sHighCode;
            //组合高位字节和地位字节并返回
            return sLowCode + sHighCode;
        }

        public string CodingToCharacter(string coding)
        {
            //如果编码不是4位数字，则返回空值
            if (coding.Length != 4)
                return "";
            byte[] bytes = new byte[2];
            //提取低位编码到字节数组中
            string sLowCode = coding.Substring(0, 2);
            int nLowCode = Convert.ToByte(sLowCode, 10) + 160;
            bytes[0] = (byte)nLowCode;
            //提取高位编码到字节数组中
            string sHighCode = coding.Substring(2, 2);
            int nHighCode = Convert.ToByte(sHighCode, 10) + 160;
            bytes[1] = (byte)nHighCode;
            //使用GB2312编码
            Encoding gb = Encoding.GetEncoding("gb2312");
            //将字节转换为汉字
            string sChar = gb.GetString(bytes);
            return sChar;
        }
        //将汉字转换为区位码
        private void button1_Click(object sender, EventArgs e)
        {
            string sChar = textBox1.Text.Trim();
            if (sChar.Length > 0)
            {
                string sCode = CharacterToCoding(sChar[0]);
                textBox2.Text = sCode;
            }
        }
        //将区位码转换为汉字
        private void button2_Click(object sender, EventArgs e)
        {
            string sCode = textBox3.Text.Trim();
            if (sCode.Length > 0)
            {
                string sChar = CodingToCharacter(sCode);
                textBox4.Text = sChar;
            }
        }
    }
}