/// <summary>
        /// 得到每个汉字的字首拼音码字母(大写)
        /// </summary>
        /// <param name="chrStr">输入字符串</param>
        /// <returns>返回结果</returns>
        public string GetHeadCharacter(string chrStr)
        {
            string strHeadString = string.Empty;

            Encoding gb = System.Text.Encoding.GetEncoding("gb2312");
            for (int i = 0; i < chrStr.Length; i++)
            {
                //检测该字符是否为汉字
                if (!IsChineseCharacters(chrStr.Substring(i, 1)))
                {
                    strHeadString += chrStr.Substring(i, 1);
                    continue;
                }

                byte[] bytes = gb.GetBytes(chrStr.Substring(i, 1));
                string lowCode = System.Convert.ToString(bytes[0] - 0xA0, 16);
                string hightCode = System.Convert.ToString(bytes[1] - 0xA0, 16);
                int nCode = Convert.ToUInt16(lowCode, 16) * 100 + Convert.ToUInt16(hightCode, 16);      //得到区位码
                strHeadString += FirstLetter(nCode);
            }
            return strHeadString;
        }