C# EXCEL表格生成 NPOI.dll应用2（表格样式）

using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System.IO;


            XSSFWorkbook workbook = new XSSFWorkbook();
            ISheet sheet = workbook.CreateSheet();
            
            sheet.SetColumnWidth(0, (int)((15 + 0.72) * 256)); //*设置宽度（列号，宽度）
            sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 2, 0, 3));//*合并单元格（起始行号，终止行号， 起始列号，终止列号）

            IRow row0 = sheet.CreateRow(0);
            row0.Height = 20 * 20;//*行高
            
            ICell t0 = (ICell)row0.CreateCell(0); //创建单元格

            {
                //1.定义属性
                ICellStyle cellStyle = workbook.CreateCellStyle();
                //2.文字
                IFont font = workbook.CreateFont();//文字属性
                font.Color = HSSFColor.OliveGreen.Blue.Index;//颜色
                font.IsItalic = true;//下划线  
                font.FontHeightInPoints = 10;
                font.FontName = \"微软雅黑\";
                cellStyle.SetFont(font);
                //3.边框
                cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Dotted;//上
                cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Dotted;//下
                cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Hair;//左
                cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Hair;//右
                cellStyle.TopBorderColor = HSSFColor.OliveGreen.Blue.Index;//上边框颜色
                cellStyle.BottomBorderColor = HSSFColor.OliveGreen.Blue.Index;//下边框颜色  
                cellStyle.LeftBorderColor = HSSFColor.OliveGreen.Blue.Index;//左边框颜色  
                cellStyle.RightBorderColor = HSSFColor.OliveGreen.Blue.Index;//右边框颜色

                cellStyle.FillForegroundColor = HSSFColor.Blue.Index;//选中后文字背景
                cellStyle.FillBackgroundColor = HSSFColor.Red.Index;//选中后单元格背景
                cellStyle.FillPattern = FillPattern.AltBars;

                cellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Left;//水平对齐
                cellStyle.VerticalAlignment = VerticalAlignment.Center;//垂直对齐
                cellStyle.WrapText = true; //自动换行
                cellStyle.Indention = 0;//缩进

                t0.CellStyle = cellStyle;//*单元格属性
            }
            t0.SetCellValue(\"内容\");
            string FilePath = \"Documents/xxx.xlsx\";
            FilePath = Path.GetFullPath(FilePath);
            using (FileStream file = new FileStream(FilePath, FileMode.Create))
            {
                workbook.Write(file);
            }