NPOI合并单元格后边框显示不正确？

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);

注意：如果新建行，边框会初始化。

 

参考：https://q.cnblogs.com/q/42580/