在Excel中连续地将数据保存到列中

我在保存标签中的数据时遇到了麻烦。 当我保存时，它总是覆盖。 将数据保存到列B是可以的，但是当它转到列C时，它会覆盖它。 B列中的数据将被删除。 只有C列被保存。

private void button1_Click(object sender, EventArgs e) { Microsoft.Office.Interop.Excel.Application OfficeExcel; Microsoft.Office.Interop.Excel._Workbook OfficeWorkBook; Microsoft.Office.Interop.Excel._Worksheet OfficeSheet; try { //Start Excel and get Application object. OfficeExcel = new Microsoft.Office.Interop.Excel.Application(); OfficeExcel.Visible = true; //Get a new workbook. OfficeWorkBook = (Microsoft.Office.Interop.Excel._Workbook)(OfficeExcel.Workbooks.Add("")); OfficeSheet = (Microsoft.Office.Interop.Excel._Worksheet)OfficeWorkBook.ActiveSheet; int apple = 10, banana = 11, grapes = 12, orange = 5; int apple2 = 20, banana2 = 21, grapes2 = 22, orange2 = 15; switch (cmbDays.SelectedItem.ToString()) { case "1": lbltotalapple.Text = apple.ToString(); lbltotalbanana.Text = banana.ToString(); lbltotalgrapes.Text = grapes.ToString(); lbltotalorange.Text = orange.ToString(); //Add table headers going cell by cell. OfficeSheet.Cells[3, 2] = lbltotalapple.Text; OfficeSheet.Cells[4, 2] = lbltotalbanana.Text; OfficeSheet.Cells[5, 2] = lbltotalgrapes.Text; OfficeSheet.Cells[6, 2] = lbltotalorange.Text; OfficeExcel.Visible = false; OfficeExcel.UserControl = false; // I think is the problem. How do I make it continously save. Not overwriting it. OfficeWorkBook.SaveAs("D:\\test\\test1.xls", Microsoft.Office.Interop.Excel.XlFileFormat.xlExcel7, Type.Missing, Type.Missing, false, false, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing); OfficeWorkBook.Close(); break; case "2": lbltotalapple.Text = apple2.ToString(); lbltotalbanana.Text = banana2.ToString(); lbltotalgrapes.Text = grapes2.ToString(); lbltotalorange.Text = orange2.ToString(); OfficeSheet.Cells[3, 3] = lbltotalapple.Text; OfficeSheet.Cells[4, 3] = lbltotalbanana.Text; OfficeSheet.Cells[5, 3] = lbltotalgrapes.Text; OfficeSheet.Cells[6, 3] = lbltotalorange.Text; OfficeExcel.Visible = false; OfficeExcel.UserControl = false; // I think is the problem. How do I make it continously save. Not overwriting it. OfficeWorkBook.SaveAs("D:\\test\\test1.xls", Microsoft.Office.Interop.Excel.XlFileFormat.xlExcel7, Type.Missing, Type.Missing, false, false, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing); OfficeWorkBook.Close(); break; } } catch (Exception ex) { // do something } } 

如何从列B到C等连续保存？