Download PDF from ASP.Net

Question

I use ITextSharp to generate PDF on the fly, and then save it to disk and display it using Frame.

There is an src attribute in the frame where I pass the generated file name.

It all works fine, what I want to achieve is to transfer the generated PDF file to Frame without saving it to disk.

HtmlToPdfBuilder builder = new HtmlToPdfBuilder(PageSize.LETTER);
HtmlPdfPage first = builder.AddPage();

//import an entire sheet
builder.ImportStylesheet(Request.PhysicalApplicationPath + "CSS\\Stylesheet.css");
string coupon = CreateCoupon();
first.AppendHtml(coupon);

byte[] file = builder.RenderPdf();
File.WriteAllBytes(Request.PhysicalApplicationPath+"final.pdf", file);
printable.Attributes["src"] = "final.pdf";

Answer 1

I did exactly what you are trying to do. You want to create a handler (.ashx). Once you have created your PDF file, upload it to the handler using the following code:

[WebService(Namespace = "http://tempuri.org/")] 
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] 
public class MapHandler : IHttpHandler, IReadOnlySessionState 
{ 

    public void ProcessRequest(HttpContext context) { 
        CreateImage(context); 
    } 

    private void CreateImage(HttpContext context) { 

        string documentFullname = // Get full name of the PDF you want to display... 

        if (File.Exists(documentFullname)) { 

            byte[] buffer; 

            using (FileStream fileStream = new FileStream(documentFullname, FileMode.Open, FileAccess.Read, FileShare.Read)) 
            using (BinaryReader reader = new BinaryReader(fileStream)) { 
                buffer = reader.ReadBytes((int)reader.BaseStream.Length); 
            } 

            context.Response.ContentType = "application/pdf"; 
            context.Response.AddHeader("Content-Length", buffer.Length.ToString()); 
            context.Response.BinaryWrite(buffer); 
            context.Response.End(); 

        } else { 
            context.Response.Write("Unable to find the document you requested."); 
        } 
    } 

    public bool IsReusable { 
        get { 
            return false; 
        } 
    }