/// <summary>

        /// 获得字符串首字符字母（大写）；

        /// </summary>

        /// <param name="cnChar"></param>

        /// <returns></returns>

        public string GetStringFirstSpell(string cnChar)

        {

            //除字母、数字、汉字以外的返回"*"

            var result = "*";

            if (string.IsNullOrEmpty(cnChar.Trim()))

                return result;

            cnChar = cnChar.Trim().Substring(, );

            byte[] arrCn = Encoding.Default.GetBytes(cnChar);

            //首字为字符,占一个字节

            if (arrCn.Length <= )

            {

                //大写英文字母

                if ((short)arrCn[] >=  && (short)arrCn[] <= )

                    return cnChar;

                //小写英文字母

                if (arrCn[] >=  && arrCn[] <= )

                    return Encoding.Default.GetString(new byte[] { (byte)((short)arrCn[] - ) });

                //数字

                switch (cnChar)

                {

                    case "":

                        result = "Y";

                        break;

                    case "":

                        result = "E";

                        break;

                    case "":

                    case "":

                        result = "S";

                        break;

                    case "":

                        result = "W";

                        break;

                    case "":

                    case "":

                        result = "L";

                        break;

                    case "":

                        result = "Q";

                        break;

                    case "":

                        result = "B";

                        break;

                    case "":

                        result = "J";

                        break;

                }

                return result;

            }

            //首字为汉字,占两个字节

            else

            {

                int area = (short)arrCn[];

                int pos = (short)arrCn[];

                int code = (area << ) + pos;

                int[] areacode = { , , , , , , , , , , , , , , , , , , , , , , , , ,  };

                for (int i = ; i < ; i++)

                {

                    int max = ;

                    if (i != ) max = areacode[i + ];

                    if (areacode[i] <= code && code < max)

                    {

                        return Encoding.Default.GetString(new byte[] { (byte)( + i) });

                    }

                }

                return result;

            }

        }