在用NPOI导出EXCEL的时候设置分页，在网上有查到用sheet1.SetRowBreak(i)方法，但一直都没有起到作用。经过研究是要设置  sheet1.FitToPage = false; 而这个属性默认是true的，怪不得一直设置都不起作用。

设置打印标题用

 hssfworkbook.SetRepeatingRowsAndColumns(0, 0, 5, 0, 5);

但最新版本已经有新的方法了。

sheet.RepeatingRows=new CellRangeAddress(0,5,0,5)

Sheet sheet1 = hssfworkbook.CreateSheet("Sheet1");            sheet1.SetMargin(MarginType.RightMargin, (double)0.5);            sheet1.SetMargin(MarginType.TopMargin, (double)0.6);            sheet1.SetMargin(MarginType.LeftMargin, (double)0.4);            sheet1.SetMargin(MarginType.BottomMargin, (double)0.3);            sheet1.PrintSetup.Copies = 3;            sheet1.PrintSetup.NoColor = true;            sheet1.PrintSetup.Landscape = true;            sheet1.PrintSetup.PaperSize = (short)PaperSize.A4;            sheet1.PrintSetup.FitHeight = 2;            sheet1.PrintSetup.FitWidth = 3;            sheet1.IsPrintGridlines = true;            //是否自适应界面            sheet1.FitToPage = false;            //设置打印标题            hssfworkbook.SetRepeatingRowsAndColumns(0, 0, 5, 0, 5);