在用NPOI匯出EXCEL的時候設定分頁，在網上有查到用sheet1.SetRowBreak(i)方法，但一直都沒有起到作用。經過研究是要設定  sheet1.FitToPage = false; 而這個屬性預設是true的，怪不得一直設定都不起作用。

設定列印標題用

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

但最新版本已經有新的方法了。

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;

//是否自適應介面 sheet1.FitToPage = false;

//設定列印標題 hssfworkbook.SetRepeatingRowsAndColumns(0, 0, 5, 0, 5);