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, "\t", 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();

 

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