如何在MVC中将PDF返回到浏览器？

我使用此代码。

using iTextSharp.text;using iTextSharp.text.pdf;public FileStreamResult pdf(){    MemoryStream workStream = new MemoryStream();    document document = new document();    PdfWriter.GetInstance(document, workStream).CloseStream = false;    document.Open();    document.Add(new Paragraph("Hello World"));    document.Add(new Paragraph(DateTime.Now.ToString()));    document.Close();    byte[] byteInfo = workStream.ToArray();    workStream.Write(byteInfo, 0, byteInfo.Length);    workStream.Position = 0;    return new FileStreamResult(workStream, "application/pdf");    }