字符串轉化為RTF格式－RTF研究系列

本人由於項目的需要，對RTF格式做了比較深入的研究，其中有些心得與源碼與大家分享！

 平台與語言：VS2005,C#
/// <summary>
        /// string轉化為RTF類型
        /// </summary>
        /// <param name="strs"></param>
        /// <returns></returns>
        public static string Str2RTF(string strs)
        {
            string tmpStr = "", tmpStr2 = "", strToRTF = "";
            int lstrLen = strs.Length;
            if (lstrLen == 0)
                return "";
            foreach (Char c in strs)
            {
                tmpStr = c.ToString();
                int tmpAsc = (int)c;
                if (tmpAsc > 126)//轉換非ASCII范圍的文本為RTF格式
                {
                    tmpStr = CharTo16(c);
                    if (tmpStr.Length == 1)
                        tmpStr = @"\'0" + tmpStr;//轉換hex值小於2位的特殊控制符號
                    else if (tmpStr.Length == 2)
                        tmpStr = @"\'" + tmpStr;//轉換hex值等於2位的特殊符號
                    else
                    {
                        tmpStr2 = tmpStr.Substring(tmpStr.Length - 2, 2); //Right(tmpStr, 2);
                        tmpStr = tmpStr.Substring(0, 2); //Left(tmpStr, 2);
                        tmpStr = @"\'" + tmpStr + @"\'" + tmpStr2;// '轉換hex值等於4位的非英文字符內碼
                    }
                }
                //if (tmpStr == "\'0D" || tmpStr == "\'0A")//Then '對換行符號進行特殊控制：0D 0A
                //    tmpStr = @"}{\insrsid198535 \par }{\insrsid198535 \loch\af0\hich\af0\dbch\f13 ";

                strToRTF += tmpStr;
            }
            return strToRTF;
        }

/// <summary>
        /// Char轉16進制字符
        /// </summary>
        /// <param name="ch"></param>
        /// <returns></returns>
        public static string CharTo16(char ch)
        {
            System.Text.Encoding chs = System.Text.Encoding.GetEncoding("gb2312");
            byte[] bytes = chs.GetBytes(ch.ToString());
            string str = "";
            for (int i = 0; i < bytes.Length; i++)
            {
                str += string.Format("{0:X2}", bytes[i]);
            }
            return str.ToLower();
        }