/// <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(0, 1);            byte[] arrCn = Encoding.Default.GetBytes(cnChar);            //首字为字符,占一个字节            if (arrCn.Length <= 1)            {                //大写英文字母                if ((short)arrCn[0] >= 65 && (short)arrCn[0] <= 90)                    return cnChar;                                //小写英文字母                if (arrCn[0] >= 97 && arrCn[0] <= 122)                    return Encoding.Default.GetString(new byte[] { (byte)((short)arrCn[0] - 32) });                //数字                switch (cnChar)                {                    case "1":                        result = "Y";                        break;                    case "2":                        result = "E";                        break;                    case "3":                    case "4":                        result = "S";                        break;                    case "5":                        result = "W";                        break;                    case "0":                    case "6":                        result = "L";                        break;                    case "7":                        result = "Q";                        break;                    case "8":                        result = "B";                        break;                    case "9":                        result = "J";                        break;                }                return result;            }            //首字为汉字,占两个字节            else            {                int area = (short)arrCn[0];                int pos = (short)arrCn[1];                int code = (area << 8) + pos;                int[] areacode = { 45217, 45253, 45761, 46318, 46826, 47010, 47297, 47614, 48119, 48119, 49062, 49324, 49896, 50371, 50614, 50622, 50906, 51387, 51446, 52218, 52698, 52698, 52698, 52980, 53689, 54481 };                for (int i = 0; i < 26; i++)                {                    int max = 55290;                    if (i != 25) max = areacode[i + 1];                    if (areacode[i] <= code && code < max)                    {                        return Encoding.Default.GetString(new byte[] { (byte)(65 + i) });                    }                }                return result;            }        }