C# HttpGet response gives me an empty Excel file with EPPlus

Question

I\'ve created an endpoint that generates an Excel file. It\'s supposed to function as a GET in case I want some other code to POST it to a different endpoint for emailing, or in

Answer 1

I use this to send the Excel file to the browser.

HttpResponse Response = HttpContext.Current.Response;

//first convert to byte array
byte[] bin = excelPackage.GetAsByteArray();

//clear the buffer stream
Response.ClearHeaders();
Response.Clear();
Response.Buffer = true;

//add the content type
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";

//set the content length, without it, length is set to -1 and could give errors
Response.AddHeader("content-length", bin.Length.ToString());

//add a filename
Response.AddHeader("content-disposition", "attachment; filename=\"" + fileName + ".xlsx\"");

//send the file to the browser
Response.OutputStream.Write(bin, 0, bin.Length);

//cleanup
Response.Flush();
HttpContext.Current.ApplicationInstance.CompleteRequest();