Question

Thread abort error when exporting gridview from content page

Asked by: Recori

I am getting a thread abort error when exporting gridview from content page. I have created an override function for the page's render control but continue to get the error. Any help would be greatly appreciated!
TIA!

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Asked On
2009-11-04 at 15:55:16ID24873049
Tags

asp.net

,

vb.net

,

asp

,

vb

Topics

Programming for ASP.NET

,

Visual Studio

,

.NET Framework 3.x versions

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Answers

 

by: carlnorrbomPosted on 2009-11-04 at 22:41:30ID: 25747213

Hi,

I tend to Use Matt Berseth's approach which I find covers most requirements for exporting gridviews. You can find code and complete instructions on how to use it here:

http://mattberseth.com/blog/2007/04/export_gridview_to_excel_1.html

/Carl.

 

by: RecoriPosted on 2009-11-05 at 05:45:22ID: 25749329

I am still getting the Thread Abort error. I have used a variety of flavors of this. I have also tried the post you suggested. From what I understand the error I get is because I am on a content page and not a regular page.
Code:
Private Sub Export()
Response.Clear()
            Response.AddHeader("content-disposition", "attachment;filename=CostRptData.xls")
            Response.Charset = ""
            ' If you want the option to open the Excel file without saving than comment out the line below
            ' Response.Cache.SetCacheability(HttpCacheability.NoCache);
            Response.ContentType = "application/vnd.xls"  '"application/ms-excel"   or "application/vnd.ms-excel"
            Dim sw As New System.IO.StringWriter
            Dim htmlWrite As System.Web.UI.HtmlTextWriter = New HtmlTextWriter(sw)
            grdCostRpt.RenderControl(htmlWrite)
            Response.Write(sw.ToString())
            Response.Flush()
            Response.End()
End Sub

 Public Overloads Overrides Sub VerifyRenderingInServerForm(ByVal control As Control)
        ' Verifies that the control is rendered
End Sub

 

by: RecoriPosted on 2009-11-06 at 06:04:58ID: 25759153

Turns out this is a known issue with Microsoft
http://blogs.msdn.com/vsofficedeveloper/pages/Excel-2007-Extension-Warning.aspx

I used the following

Protected Sub ExportToExcel()
        Try
1000:       If Session("CostRptData") Is Nothing Then Exit Sub

1005:       Dim myDataTable As New DataTable
            Dim rowCount As Integer = 1
            Dim xlWorkBook As Excel.Workbook
            Dim xlWorkSheet As Excel.Worksheet

1010:       xlWorkBook = New Excel.Application().Workbooks.Add(Missing.Value)
            xlWorkBook.Application.Visible = True
            xlWorkSheet = xlWorkBook.ActiveSheet

1020:       '   Sets the dataset containing the data
            myDataTable = Session("CostRptData")
            '   Outputting the column names
            For xx As Integer = 0 To (myDataTable.Columns.Count - 1)
                xlWorkSheet.Cells(1, xx + 1) = myDataTable.Columns(xx).ColumnName.ToString
            Next xx

1030:       ' Set Black bold color
            xlWorkSheet.Range("$A1:$ZZ1").Font.Bold = True
            xlWorkSheet.Range("$A1:$ZZ1").Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.LightSteelBlue)

1040:       ' Outputting the data
            For Each dr As DataRow In myDataTable.Rows
                rowCount = rowCount + 1
                For yy As Integer = 0 To (myDataTable.Columns.Count - 1)
                    xlWorkSheet.Cells(rowCount, yy + 1) = dr(yy)
                Next
            Next

1050:       'Auto fit the columns
            xlWorkSheet.Columns.AutoFit()
        Catch ex As Exception
            Dim errMsg As String = "Error exporting data to excel." & vbCrLf & _
                                     ex.ToString & vbCrLf & "Error Number: " & Err.Number & "  Erl: " & Erl()
            MsgBox(errMsg, MsgBoxStyle.Critical, "Error")
        End Try
    End Sub

 

by: carlnorrbomPosted on 2009-11-06 at 08:54:09ID: 25760815

Hi,

Ok, from your subject I did not realise it was this error you were experiensing ("Thread Abort vs. Extension Hardening), because this is a well known issue for me as well. And as you have realised, Excel automation is the way around it.

Just make sure you are developing on the same version the Exel dll that's deployed to the clients or it may brake. In that case you can use late binding to work around it. Good luck with your project!

/Carl.

20120131-EE-VQP-002

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