using System;
using System.Text;
using System.Text.RegularExpressions;
using System.Globalization;
public class GB2312UnicodeConverter
{
    /// <summary>
    /// ºº×Öת»»ÎªUnicode±àÂë
    /// </summary>
    /// <param name="str">Òª±àÂëµÄºº×Ö×Ö·û´®</param>
    /// <returns>Unicode±àÂëµÄµÄ×Ö·û´®</returns>
    public static string ToUnicode(string str)
    {
        byte[] bts = Encoding.Unicode.GetBytes(str);
        string r = "";
        for (int i = 0; i < bts.Length; i += 2) r += "\\u" + bts[i + 1].ToString("x").PadLeft(2, '0') + bts[i].ToString("x").PadLeft(2, '0');
        return r;
    }
    /// <summary>
    /// ½«Unicode±àÂëת»»Îªºº×Ö×Ö·û´®
    /// </summary>
    /// <param name="str">Unicode±àÂë×Ö·û´®</param>
    /// <returns>ºº×Ö×Ö·û´®</returns>
    public static string ToGB2312(string str)
    {
        string r = "";
        MatchCollection mc = Regex.Matches(str, @"\\u([\w]{2})([\w]{2})", RegexOptions.Compiled | RegexOptions.IgnoreCase);
        byte[] bts = new byte[2];
        foreach(Match m in mc )
        {
            bts[0] = (byte)int.Parse(m.Groups[2].Value, NumberStyles.HexNumber);
            bts[1] = (byte)int.Parse(m.Groups[1].Value, NumberStyles.HexNumber);
            r += Encoding.Unicode.GetString(bts);
        }
        return r;
    }
}