Npoi操作excel

 http://www.cnblogs.com/knowledgesea/archive/2012/11/16/2772547.html

设置背景颜色，边框

         //设置样式
                 HSSFCellStyle ShenPiStyle = (HSSFCellStyle)workbook.CreateCellStyle();

                 ShenPiStyle.Alignment = (HorizontalAlignment)HorizontalAlign.Left;
                 ShenPiStyle.VerticalAlignment = VerticalAlignment.CENTER;
                 ShenPiStyle.WrapText = true; //自动换行

                 HSSFFont ShenPiStylefonts = (HSSFFont)workbook.CreateFont();
                 ShenPiStylefonts.FontHeightInPoints = 11;
                 ShenPiStylefonts.FontName = "宋体";
                 ShenPiStyle.SetFont(ShenPiStylefonts);
                 ShenPiStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.THIN;
                 ShenPiStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.THIN;
                 ShenPiStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.THIN;
                 ShenPiStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.THIN;

                 ShenPiStyle.FillForegroundColor = HSSFColor.LIGHT_CORNFLOWER_BLUE.index;
                 ShenPiStyle.FillPattern = NPOI.SS.UserModel.FillPatternType.SOLID_FOREGROUND;

                 //ShenPiStyle.FillBackgroundColor = HSSFColor.BLUE.index;
                 
                 BeiZhu.GetCell(0).CellStyle = ShenPiStyle;

合并单元格设置单元格的边框：

      HSSFRow BeiZhu = (HSSFRow)sheet.CreateRow(rowIndex); //第 3 行
                 BeiZhu.Height = 80 * 20;

                 CellRangeAddress region = new CellRangeAddress(rowIndex, rowIndex, 0, 6);
                 sheet.AddMergedRegion(region);
                 ((HSSFSheet)sheet).SetEnclosedBorderOfRegion(region, NPOI.SS.UserModel.BorderStyle.THIN, HSSFColor.BLACK.index);

NPOI单元格颜色设置及对照表

 http://www.docin.com/p-665268648.html

设置合并单元格文字竖行显示：

                 //竖行显示的文字样式
                 HSSFCreationHelper createHelper = (HSSFCreationHelper)workbook.GetCreationHelper();

                 HSSFCellStyle shu = (HSSFCellStyle)workbook.CreateCellStyle();
                 shu.VerticalAlignment = VerticalAlignment.CENTER;
                 shu.Alignment = (HorizontalAlignment)HorizontalAlign.Center;
                 //多行显示
                 shu.WrapText = true;

                 HSSFFont shufonts = (HSSFFont)workbook.CreateFont();
                 shufonts.FontHeightInPoints = 11;
                 shufonts.FontName = "宋体";
                 shufonts.Boldweight = 600;
                 shu.SetFont(shufonts);
                 //shu.Rotation = (short)-90;

                 shu.BorderBottom = NPOI.SS.UserModel.BorderStyle.THIN;
                 shu.BorderRight = NPOI.SS.UserModel.BorderStyle.THIN;
                 shu.BorderTop = NPOI.SS.UserModel.BorderStyle.THIN;

                 HSSFRow row3 = (HSSFRow)sheet.CreateRow(3); //第 3 行
                 row3.Height = 30 * 20;

                 row3.CreateCell(0, CellType.STRING).SetCellValue(createHelper.CreateRichTextString("本
周
工
作
总
结
")); 

                 row3.GetCell(0).CellStyle = shu;