public string GetPYString(string str)
        {
            string tempStr = "";
            foreach(char c in str)
            {
                if((int)c >= 33 && (int)c <=126)
                {//字母和符号原样保留
                    tempStr += c.ToString();
                }
                else
                {//累加拼音声母
                    tempStr += GetPYChar(c.ToString());
                }
            }
            return tempStr;
        }

        /// <summary>
        /// 取单个字符的拼音声母
        /// Code By MuseStudio@hotmail.com
        /// 2004-11-30
        /// </summary>
        /// <param name="c">要转换的单个汉字</param>
        /// <returns>拼音声母</returns>
        public string GetPYChar(string c)
        {
            byte[] array = new byte[2];
            array = System.Text.Encoding.Default.GetBytes(c);
            int i = (short)(array[0] - '\0') * 256 + ((short)(array[1] - '\0'));

            if ( i < 0xB0A1) return "*";
            if ( i < 0xB0C5) return "a";
            if ( i < 0xB2C1) return "b";
            if ( i < 0xB4EE) return "c";
            if ( i < 0xB6EA) return "d";
            if ( i < 0xB7A2) return "e";
            if ( i < 0xB8C1) return "f";
            if ( i < 0xB9FE) return "g";
            if ( i < 0xBBF7) return "h";
            if ( i < 0xBFA6) return "g";
            if ( i < 0xC0AC) return "k";
            if ( i < 0xC2E8) return "l";
            if ( i < 0xC4C3) return "m";
            if ( i < 0xC5B6) return "n";
            if ( i < 0xC5BE) return "o";
            if ( i < 0xC6DA) return "p";
            if ( i < 0xC8BB) return "q";
            if ( i < 0xC8F6) return "r";
            if ( i < 0xCBFA) return "s";
            if ( i < 0xCDDA) return "t";
            if ( i < 0xCEF4) return "w";
            if ( i < 0xD1B9) return "x";
            if ( i < 0xD4D1) return "y";
            if ( i < 0xD7FA) return "z";

            return "*";
        }