Creating an excel file with EPPlus, but it is always read-only

问题

I'm creating/sending a file with EPPlus like this:

using (ExcelPackage package = new ExcelPackage())
{

    ExcelWorksheet worksheet = package.Workbook.Worksheets.Add("Sheet");
    ... //create file here

    Response.Clear();
    Response.ContentType = "application/xlsx";
    Response.AddHeader("content-disposition", "attachment; filename=" + filename + ".xlsx");
    Response.BinaryWrite(package.GetAsByteArray());
    Response.End();
}

Everything works fine, except the file always comes back as read-only, and I can't figure out why. Within the "package" object, there is a file object with a IsReadOnly field, but the file object is null. I anticipate that I'm not creating the xcel file correctly, but this is the only way I could figure out how to create the file well. Initially I was using a memory stream, but doing that, I ran into issues when the excel file was bigger than 50 rows.

Edit/update: So I initiate the code block by clicking a button "Download as Excel File". The code runs, creating the file, and the user is prompted with a "You have chose to open: thisismyexcelfile.xlsx which is a: XLSX file (size here) from: mywebsite. What should firefox do with this file?" After selecting "Open with OpenOffice Calc" the spreedsheet opens and displays appropriately but is read-only.

Edit/update: I checked the file properties with OpenOffice. Under Properties/Security there is a "Open file Read Only" checkbox, but it is already unchecked and disabled.

回答1:

I found this example, I see 3 main differences

Response.ContentType is set to application/vnd.openxmlformats
Response.WriteFile is used instead or Response.BinaryWrite

In this example the file is being saved to the server, sent as response and then deleted

void ExportToExcel(Event evt)
{
    var fileInfo = new FileInfo(Path.GetTempPath() + "\\" +  
                            DateTime.Now.Ticks + ".xlsx");

    using (var xls = new ExcelPackage(fileInfo))
    {
        var sheet = xls.Workbook.Worksheets.Add(evt.Title);

        sheet.Cell(1, 1).Value = "First name";
        sheet.Cell(1, 2).Value = "Last name";
        sheet.Cell(1, 3).Value = "E-mail";
        sheet.Cell(1, 4).Value = "Phone";
        sheet.Cell(1, 5).Value = "Registered";
        sheet.Cell(1, 6).Value = "Live Meeting";

        var i = 1;
        foreach(var attendee in evt.Attendees)
        {
            i++;

            var profile = attendee.Profile;
            sheet.Cell(i, 1).Value = profile.FirstName;
            sheet.Cell(i, 2).Value = profile.LastName;
            sheet.Cell(i, 3).Value = profile.Email;
           sheet.Cell(i, 4).Value = profile.Phone;
            sheet.Cell(i, 5).Value = att.Created.ToString();
            sheet.Cell(i, 6).Value = att.LiveMeeting.ToString();
        }

        xls.Save(); 
    }

    Response.Clear();
    Response.ContentType = "application/vnd.openxmlformats";
    Response.AddHeader("Content-Disposition", 
                   "attachment; filename=" + fileInfo.Name);
    Response.WriteFile(fileInfo.FullName);
    Response.Flush();

    if (fileInfo.Exists)
        fileInfo.Delete(); 
}

回答2:

From the comments, I was able to verify that saving the file to a location on the disk and opening it directly did not open the file as read-only, implying the problem was not with the code, but the browsers handling of files downloaded from the internet.

来源：https://stackoverflow.com/questions/18059979/creating-an-excel-file-with-epplus-but-it-is-always-read-only

标签

.net

epplus