Npoi复制行

 private void CopyRange(HSSFWorkbook myHSSFWorkBook, int fromRowIndex, int fromColIndex, int toRowIndex, int toColIndex, bool onlyData, bool copyComment)
        {
            HSSFRow sourceRow = myHSSFWorkBook.GetSheetAt(myHSSFWorkBook.ActiveSheetIndex).GetRow(fromRowIndex);
            HSSFCell sourceCell = sourceRow.GetCell(fromColIndex);
            if (sourceRow != null && sourceCell != null)
            {
                HSSFRow changingRow = null;
                HSSFCell changingCell = null;
                changingRow = myHSSFWorkBook.GetSheetAt(myHSSFWorkBook.ActiveSheetIndex).GetRow(toRowIndex);
                if (changingRow == null)
                    changingRow = myHSSFWorkBook.GetSheetAt(myHSSFWorkBook.ActiveSheetIndex).CreateRow(toRowIndex);
                changingCell = changingRow.GetCell(toColIndex);
                if (changingCell == null)
                    changingCell = changingRow.CreateCell(toColIndex);

                if (onlyData)//仅数据
                {
                    //对单元格的值赋值
                    changingCell.SetCellValue(sourceCell.StringCellValue);
                }
                else         //非仅数据
                {
                    //单元格的编码
                    changingCell.Encoding = sourceCell.Encoding;
                    //单元格的格式
                    changingCell.CellStyle = sourceCell.CellStyle;
                    //单元格的公式
                    if (sourceCell.CellFormula == "")
                        changingCell.SetCellValue(sourceCell.StringCellValue);
                    else
                        changingCell.SetCellFormula(sourceCell.CellFormula);
                    //对单元格的批注赋值
                    if (copyComment)
                    {
                        if (sourceCell.CellComment != null)
                        {
                            HSSFPatriarch patr = myHSSFWorkBook.GetSheetAt(myHSSFWorkBook.ActiveSheetIndex).CreateDrawingPatriarch();
                            HSSFComment comment = patr.CreateComment(new HSSFClientAnchor(0, 0, 0, 0, toColIndex, toRowIndex, toColIndex + 1, toRowIndex + 1));

                            comment.String = new HSSFRichTextString(sourceCell.CellComment.String.ToString());
                            comment.Author = sourceCell.CellComment.Author;

                            changingCell.CellComment = comment;
                        }
                    }
                }
            }
        }

来源：https://www.cnblogs.com/oliver_zh/archive/2010/08/09/1796002.html