ExcelSoftArtisans - Bug on Save method with open Stream - Cannot accessed closed file - officewriter

Question

I have the following issue:
I’m doing an export of an ASP.Net GridView directly to an excel file.
I’m setting an image as a header in this method:
private static void insertPageHeaderFooter(ExcelInterfaceSoftArtisans excel,DateTime generatedDateTime)
{
StringBuilder builderFooterLeft = new StringBuilder();
builderFooterLeft.Append("&08Comfone AG Tel: [phone]");
builderFooterLeft.Append("\r");
builderFooterLeft.Append("&08Nussbaumstrasse 25 Fax: [phone]");
builderFooterLeft.Append("\r");
builderFooterLeft.Append("&08CH-3000 Bern 22 www.comfone.com");
StringBuilder builderFooterRight = new StringBuilder();
String sDateTime = generatedDateTime.ToString(CultureInfoHandler.ShortDateShortTimeFormat);
builderFooterRight.Append("&08&F");
builderFooterRight.Append("\r");
builderFooterRight.Append(string.Format("&08 {0}", sDateTime));
builderFooterRight.Append("\r"); //new line
builderFooterRight.Append("&08Page &P of &N");
excel.SetHeader("&G", 0.6, HeaderFooterSection.Section.Left, false);
excel.SetFooter(builderFooterLeft.ToString(), HeaderFooterSection.Section.Left, false);
excel.SetFooter(builderFooterRight.ToString(), HeaderFooterSection.Section.Right, false);
}
protected void SetHeader(string sText, double dImageSizeFactor, HeaderFooterSection.Section section, Worksheet sheet)
{
string headerAbsolutePath = HttpContext.Current.Server.MapPath("~/Resources/Mandates/CHECF.png");
Stream imageStream = new FileStream(headerAbsolutePath, FileMode.Open, FileAccess.Read);
Size imageSize = Image.FromStream(imageStream).Size;
imageStream = new FileStream(headerAbsolutePath, FileMode.Open, FileAccess.Read);
HeaderFooterSection header = sheet.PageSetup.GetHeader(section);
header.SetContent(sText, imageStream);
header.SetContent(sText);
header.GetPicture().Height = (int)(imageSize.Height * dImageSizeFactor);
header.GetPicture().Width = (int)(imageSize.Width * dImageSizeFactor);
imageStream.Close();
}
As you can see on the last line, I close the Stream.
Now, I want to save my excel file this way:
HttpContext.Current.Response.ClearContent();
HttpContext.Current.Response.Clear();
HttpContext.Current.Response.ClearHeaders();
excel.SaveWorkbook(sFileName, HttpContext.Current.Response, false);
/// <summary>
/// Saves the current Workbook under the given filename
/// </summary>
/// <param name="filename"></param>
/// <param name="response"></param>
/// <param name="openInBrowser"></param>
public void SaveWorkbook(string filename, HttpResponse response, bool openInBrowser)
{
if (book != null)
{
application.Save(book, response, filename, openInBrowser);
}
}
but when I close the stream in the SetHeader method, I get the following error:
Error Message: Cannot access a closed file.
Stack Trace: at System.IO.__Error.FileNotOpen()
at System.IO.FileStream.Seek(Int64 offset, SeekOrigin origin)
and when I don’t close the stream in the SetHeader method, the file is correctly saved.
Are you aware of this bug? How is it possible that I need to have an open stream in order to save an excel file? What can I do to fix that?
I’m attaching you the whole classes I’m using, so you can identify the problem better.
Thanks for your quick answer and solution on this problem.

Answer 1

[Disclaimer: I am the product owner of OfficeWriter]
This issue has been confirmed as a bug and has been submitted to the OfficeWriter development team.
In the meantime, I would recommend Sam's suggested workaround of using the overload that takes the image's file path instead of the image stream.
Here is a generic code snippet for how to insert an image into the header of an Excel file using the file path overload of HeaderFooterSection.SetContent():
//Open the workbook and get a handle on the worksheet that will contain the
//image in the header
ExcelApplication xla = new ExcelApplication();
Workbook wb = xla.Open(Page.MapPath("\\template.xlsx"));
Worksheet ws = wb.Worksheets["Sheet1"];
//Set the header
HeaderFooterSection header = ws.PageSetup.GetHeader(HeaderFooterSection.Section.Left);
header.SetContent("&G", Page.MapPath("\\images\\image1.png"));
Please see our documentation for additional reference on the SetContent() overloads and using ExcelWriter to format headers and footers in workbooks.

Answer 2

This issue has been addressed in the recent 8.5.1 release of OfficeWriter. See the change log.