Commented Unassigned: system.memoryout of exception [9259]

Hi

I exporting around 50,000 rows to excel. I am using row grouping. I have lot of groupings. It works well for 20k rows but memory spikes a lot to atleast 1 gb. Its happening on the windows 2008 r2 servers with 24 gb ram

My data is lot of processed data before passing it to worksheet. This is the reason i am unable to provide data. Please let me know if there are any corrections i need to make to get it work

Thanks

using (var workbook = new ClosedXML.Excel.XLWorkbook())
{
var ws = workbook.Worksheets.Add(dt);
if (indentLevel == 2)
{

ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Style.Font.FontColor = XLColor.Red;
}
else if (indentLevel == 3)
{
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Style.Font.FontColor = XLColor.Blue;
}
else if (indentLevel == 4)
{
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Style.Font.FontColor = XLColor.ShockingPink;
}
else if (indentLevel == 5)
{
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Style.Font.FontColor = XLColor.Green;
}
else if (indentLevel == 6)
{
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Style.Font.FontColor = XLColor.Maroon;
}
else if (indentLevel == 7)
{
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Style.Font.FontColor = XLColor.Purple;
}
else if (indentLevel == 8)
{
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Group();
ws.Rows(pointer_string.ToString() + ":" + moving_string.ToString()).Style.Font.FontColor = XLColor.Orange;
}
}
catch (Exception ex)
{
string script = "<script type=\"text/javascript\">alert('No results to export to excel');</script>";
ClientScript.RegisterClientScriptBlock(this.GetType(), "Alert", script);
break;
}
}

for (int i = 0; i < dt.Rows.Count; i++)
{
ws.Cell(i + 2, 17).Style.Font.FontColor = XLColor.Blue;
ws.Cell(i + 2, 17).Style.Font.Underline = XLFontUnderlineValues.Single;
ws.Cell(i + 2, 17).Hyperlink = new XLHyperlink(ConfigurationSettings.AppSettings["url"].ToString() + "displaybss.aspx?partnumber=" + dt.Rows[i]["Prt No"].ToString() + "&partrev=" + dt.Rows[i]["Rev"].ToString());
}

//ws.Columns().AdjustToContents();
ws.Columns(maxlevel + 1, 15).Hide();
ws.Outline.SummaryHLocation = XLOutlineSummaryHLocation.Left;
ws.Outline.SummaryVLocation = XLOutlineSummaryVLocation.Top;


HttpResponse response = Response;
response.Clear();
response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml";
response.AddHeader("content-disposition", "attachment;filename=Results.xlsx");

//MemoryStream MyMemoryStream = new MemoryStream();
using (MemoryStream MyMemoryStream = new MemoryStream())
{

workbook.SaveAs(MyMemoryStream);
response.Charset = "";
response.AddHeader("Content-Length", MyMemoryStream.Length.ToString());
response.BinaryWrite(MyMemoryStream.GetBuffer());
}

response.Flush();
response.OutputStream.Close();
response.End();
workbook.Dispose();
ws.Dispose();
ws = null;
GC.Collect();
GC.SuppressFinalize(workbook);
HttpContext.Current.ApplicationInstance.CompleteRequest();
}

}
Comments: ** Comment from web user: duncans **

Don't save the workbook to a MemoryStream because this - as the name suggests - loads the entire thing into memory, which is one of the things causing your OutOfMemoryException.

I suggest saving it to a temporary file on the file system then use Response.TransmitFile to send it. You will need to have some housekeeping task to tidy up the temporary files.