NPOI合并单元格后边框显示不正确?

方案一:

这个方法能解决:SetEnclosedBorderOfRegion()

//merged cells on mutiple rows

CellRangeAddress region = new CellRangeAddress(2, 4, 0, 0);

sheet.AddMergedRegion(region);
//set enclosed border for the merged region
((HSSFSheet)sheet).SetEnclosedBorderOfRegion(region, BorderStyle.DOTTED, NPOI.HSSF.Util.HSSFColor.RED.index);

方案2:

HSSFCellStyle style = wb.createCellStyle(); 创建样式
  style.setAlignment(HSSFCellStyle.ALIGN_RIGHT); //字体右对齐
  style.setBorderBottom(HSSFCellStyle.BORDER_THIN);//下边框
  style.setBorderLeft(HSSFCellStyle.BORDER_THIN);//左边框
  style.setBorderTop(HSSFCellStyle.BORDER_THIN);//上边框
  style.setBorderRight(HSSFCellStyle.BORDER_THIN);//右边框

HSSFRow row = sheet.createRow(1);

HSSFCell cel = row.createCell(0);

  cel.setCellValue("合并单元格");

  cel.setCellStyle(style);

  for (int j = 1; j <= 11; j++) {

    cel = row.createCell(j);

    cel.setCellStyle(style); //style为带边框的样式 上面有定义

    cel.setCellValue("");

  }

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转载自blog.csdn.net/ezreal_pan/article/details/81283464
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