issue with returning HttpResponseMessage as excel file in WebAPI

Question

I have created WebAPI which returns an excel file using closedxml nuget. Basically it converts my DataTable to excel. I\'m referring couple of links below,

Answer 1

One issue I am seeing is that :

 var stream = new FileStream(path, FileMode.Open);

you are sending FileStream. Instead of this, you can try with byte [] :

byte[] excelData  = File.ReadAllBytes(path);
result.Content = new StreamContent(excelData);

You can give a try with this.

Answer 2

Try this:

    [HttpGet]
    public HttpResponseMessage Export()
    {
        using (var wb = new XLWorkbook())
        using (MemoryStream ms = new MemoryStream())
        {
            wb.Worksheets.Add("sample").FirstCell().SetValue("some value");

            wb.SaveAs(ms);

            HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
            result.Content = new ByteArrayContent(ms.GetBuffer());
            result.Content.Headers.ContentLength = ms.Length;
            result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
            {
                FileName = "sample.xlsx"
            };
            result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            return result;
        }
    }