/// 將Unicode編碼轉換為漢字字符串     ///     /// Unicode編碼字符串     /// 漢字字符串     public static string ToGB2312(string str)     {       MatchCollection mc = Regex.Matches(str, "([//w]+)|(////u([//w]{4}))");      if (mc != null && mc.Count > 0)      {        StringBuilder sb = new StringBuilder();        foreach (Match m2 in mc)        {          string v = m2.Value;          if (v.StartsWith("http://"))          {            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;            sb.Append(Encoding.Unicode.GetString(codes));          }          else          {            sb.Append(v);          }        }        return sb.ToString();      }      else      {        return str;      }    }