背景：不说了
解决办法：
Microsoft.Office.Interop.Excel.Application xlApp; Microsoft.Office.Interop.Excel.Workbook xlWorkBook; Microsoft.Office.Interop.Excel.Worksheet xlWorkSheet; object misValue = System.Reflection.Missing.Value; xlApp = new Microsoft.Office.Interop.Excel.Application(); //Start Excel and get Application object. xlWorkBook = xlApp.Workbooks.Open(Application.StartupPath+"\Report.xls", 0, true, 5, "", "", true, Microsoft.Office.Interop.Excel.XlPlatform.xlWindows, " ", false, false, 0, true, 1, 0); xlWorkSheet = (Microsoft.Office.Interop.Excel.Worksheet)xlWorkBook.ActiveSheet; xlWorkSheet.PageSetup.PrintTitleRows = "$1:$1"; // Rows to repeat at top of Excel Page Setup xlWorkSheet.PageSetup.PrintTitleColumns = "$A:$B"; // Columns to repeat at left of Excel Page Setup xlWorkSheet.PrintOutEx();