Cannot export excel file from dataTable by using epplus in C#

Question

I have found lots of examples and tutorials about how to export a DataTable as Excel by using epplus, but I cannot find a direct way to do it. Therefore I tried the following code..

my dataTable:

===============================
d1    | d2    |  d3
===============================
aa1   | bb1   | cc1
aa2   | bb2   | cc2
aa3   | bb3   | cc3
aa4   | bb4   | cc4

script:

using OfficeOpenXml;
using OfficeOpenXml.Drawing;

//........
    protected viod exportToExcel (dataTable dt)
    {
        try
        {

            Response.Clear();
            Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            Response.AddHeader("content-disposition", "attachment;filename=" + HttpUtility.UrlEncode("Logs.xlsx", System.Text.Encoding.UTF8));

            using (ExcelPackage pck = new ExcelPackage())
            {
               ExcelWorksheet ws = pck.Workbook.Worksheets.Add("Logs");
                ws.Cells["A1"].LoadFromDataTable(dt, true);                 
                var ms = new System.IO.MemoryStream();
                pck.SaveAs(ms);
                ms.WriteTo(Response.OutputStream);                          
            }

        }
        catch (Exception ex)
        {
            Debug("error: " + ex.Message);//catch nothing
        }

    }

It returns a server error and no any exception is caught, so I have no idea what error happens..

However, no error occurs when I remove the

using (ExcelPackage pck = new ExcelPackage())

section in above code.

Any ideas?

Answer 1

Best way to export to excel from server, convert the data table to HtmlTextWriter. In the Response.AddHeader("content-disposition","attachment;filename=file.xls");

Response.ContentType="application/vnd.ms-excel"; and finally

Response.Output.Write(htmltexwriter)