class Program
    {
        static void Main(string[] args)
        {
            XLWorkbook workbook = new XLWorkbook();

            //增加 Sheet
            var sheet = workbook.Worksheets.Add("Site Tree");

            //給值
            sheet.Cell(1, 1).Value = "test";

            //範圍抓取
            var header = sheet.Range("A1:C1");

            //改格式
            header.Style.Fill.BackgroundColor = XLColor.Green;
            header.Style.Font.FontColor = XLColor.Yellow;
            header.Style.Alignment.Horizontal = XLAlignmentHorizontalValues.Center;

            //存檔
            workbook.SaveAs(System.AppDomain.CurrentDomain.BaseDirectory+"test.xlsx");
        }
    }