C#把UNICODE编码转换为GB编码的实例

public string unicodetogb(string text)    {      System.Text.RegularExpressions.MatchCollection mc = System.Text.RegularExpressions.Regex.Matches(text, "////u([//w]{4})");      if (mc != null && mc.Count > 0)      {        foreach (System.Text.RegularExpressions.Match m2 in mc)        {          string v = m2.Value;          string word = v.Substring(2);          byte[] codes = new byte[2];          int code = Convert.ToInt32(word.Substring(0, 2), 16);          int code2 = Convert.ToInt32(word.Substring(2), 16);          codes[0] = (byte)code2;          codes[1] = (byte)code;          text = text.Replace(v, Encoding.Unicode.GetString(codes));        }      }      else      {      }      return text;    }