Converting Excel File From .csv To .xlsx

Question

I want my application to go and find a csv excel file and convert it into a .xlsx file instead.

Here\'s what I\'m currently doing;

var fileName = @\"         


        

Answer 1

For those who want to use Interop instead of an external library, you can simply do this:

Application app = new Application();
Workbook wb = app.Workbooks.Open(@"C:\testcsv.csv", Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
wb.SaveAs(@"C:\testcsv.xlsx", XlFileFormat.xlOpenXMLWorkbook, Type.Missing, Type.Missing, Type.Missing, Type.Missing, XlSaveAsAccessMode.xlExclusive, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
wb.Close();
app.Quit();

The second argument of Workbook.SaveAs determines the true format of the file. You should make the filename extension match that format so Excel doesn't complain about corruption. You can see a list of the types and what they mean on MSDN.

http://msdn.microsoft.com/en-us/library/microsoft.office.interop.excel.xlfileformat.aspx

As always, please keep Microsoft's considerations in mind if this functionality is intended for a server environment. Interop may not be the way to go in that situation:

http://support.microsoft.com/kb/257757