C# Converting .xlsx to .xls

Question

I used ClosedXML.dll to create Excel file, however ClosedXML saves the excel file as .xlsx and my client's PC only runs Office 2003 so they cannot open the .xlsx file, how can I convert that .xlsx to .xls?

Any recommendations will be appreciated. Thanks to you all.

Answer 1

如果可能，请让您的客户安装Microsoft Office兼容包 ，这样他们就可以在Office 2003中打开Office 2007格式的文档。

Answer 2

从http://www.microsoft.com/downloads下载MS Office兼容包。

Answer 3

You can use Excel c# to Convert XLSX to XLS

With a code like this:

// Create new XLSX file.
var xlsxFile = new ExcelFile();

// Load data from XLSX file.
xlsxFile.LoadXlsx(fileName + ".xls", XlsxOptions.PreserveMakeCopy);

// Save XLSX file to XLS file.
xlsxFile.SaveXls(fileName + ".xls");

Answer 4

您可以尝试使用NET Office（ http://netoffice.codeplex.com/ ），它将xls转换为xlsx，因此您可以将closedXML与文件一起使用

Answer 5

Try use ExcelDataReader and ExcelPlusPlus . They are open source and good

Answer 6

I posted a question just a few days ago regarding this.

Note This is a vba solution.

This loops through a folder opening each workbook in turn and saving them in .xls format. Simply change the path marked C:xxx to the location of your .xlsx files. It avoids having to ask end users to do things to open your product and in my experience if you have a lot of users you will some incapable or unwilling to install a compatibility pack.

Option Explicit
Sub Convert_to972003()
    Dim orgwb As Workbook
    Dim mypath As String, strfilename As String
    Dim nname As String

    '--> Error Handling
    On Error GoTo WhatHappened

    '--> Disable Alerts
    With Application
        .DisplayAlerts = False
        .ScreenUpdating = False
    End With

    '--> Specify location of workbooks
    mypath = "C:\xxx"
    strfilename = Dir(mypath & "\*.xlsx", vbNormal)

    '--> Check the specified folder contains files
    If Len(strfilename) = 0 Then Exit Sub

    '--> Start Loop, end when last file reached
    Do Until strfilename = ""

    '--> Open a workbook
        Set orgwb = Application.Workbooks.Open _
        (mypath & "\" & strfilename)

        '--> Create new Filename, Save in new File Format and Close
        nname = Replace(strfilename, ".xlsx", ".xls")
        orgwb.SaveAs mypath & "\" & nname, FileFormat:=xlExcel8
        orgwb.Close
        strfilename = Dir()
    Loop

    '--> Enable Alerts
    With Application
        .DisplayAlerts = True
        .ScreenUpdating = True
    End With

Exit Sub

WhatHappened: MsgBox Err.Description

End Sub

Answer 7

使用.XlFileFormat.xlExcel7格式化excel 95文件。

Answer 8

From the FAQ of ClosedXML.dll :

Does it support Excel 2003 and prior formats (.xls)? Nope. ClosedXML only supports Excel 2007/2010 format (.xlsx).

Last edited May 16 2011 at 7:45 PM by MDeLeon, version 1

sec_goat Jul 19 at 5:54 PM I do not know if this is the right place, but this is the workaround I used for xls files. I open them in Interop.Excel and save them as the newer file type. This is not the most elegant but it at least gives people an idea of what they can do.

public void Convert(String filesFolder)
{
  files = Directory.GetFiles(filesFolder);

  var app = new Microsoft.Office.Interop.Excel.Application();
  var wb = app.Workbooks.Open(file);
  wb.SaveAs(Filename: file + "x", FileFormat: Microsoft.Office.Interop.Excel.XlFileFormat.xlOpenXMLWorkbook);
  wb.Close();
  app.Quit();
}

Hope this helps ;)