Export to Excel in ASP.Net Core 2.0

Question

I used to export data to excel in asp.net mvc using below code

    Response.AppendHeader(\"content-disposition\", \"attachment;filename=ExportedHtml.xls\");
            


        

Answer 1

Agreed with David Liang's answer.

Slide modifications if want to export whole DataTable.

            string export="export";
            DataTable dt = new DataTable();
            //Fill datatable
            dt = *something*

            byte[] fileContents;
            using (var package = new ExcelPackage())
            {
                var worksheet = package.Workbook.Worksheets.Add(export);
                worksheet.Cells["A1"].LoadFromDataTable(dt, true);
                fileContents = package.GetAsByteArray();
            }
            if (fileContents == null || fileContents.Length == 0)
            {
                return NotFound();
            }
            return File(
                fileContents: fileContents,
                contentType: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
                fileDownloadName: export + ".xlsx"
            );