Open Generated pdf file through code directly without saving it onto the disk - asp.net

Question

I use Sharepoint 2010 and I am developing a web part where on a button click event, a pdf file needs to be generated and opened directly. Should not be saving onto the disk.
I tried the below code
protected void Button1_OnClick(object sender, EventArgs e)
{
Document myDoc = new Document(PageSize.A4.Rotate());
try
{
PdfWriter.GetInstance(myDoc, new FileStream(#"C:\Directory\Test.pdf", FileMode.Create));
myDoc.Open();
myDoc.Add(new Paragraph("Hello World"));
}
catch (DocumentException ex)
{
Console.Error.WriteLine(ex.Message);
}
myDoc.Close();
}
I also tried the below code which also generates the file on the Server which I dont want.
Document document = new Document(PageSize.A4);
PdfWriter.GetInstance(document, new FileStream(HttpContext.Current.Server.MapPath("~/Test.pdf"), FileMode.Create));
document.Open();
var WelcomePara = new Paragraph("Hello World");
document.Add(WelcomePara);
document.Close();
This one creates the pdf file on the desktop, I need it to be opened in the pdf format.Can someone help me please.

Answer 1

Almost every time that something accepts a FileStream is actually really accepts a generic System.IO.Stream object which FileStream is a subclass of. This means that you can instead use its cousin System.IO.MemoryStream which is what you are looking for:
byte[] bytes;
using (System.IO.MemoryStream ms = new System.IO.MemoryStream()) {
using (iTextSharp.text.Document doc = new iTextSharp.text.Document(iTextSharp.text.PageSize.A4.Rotate())) {
using (iTextSharp.text.pdf.PdfWriter w = iTextSharp.text.pdf.PdfWriter.GetInstance(doc, ms)) {
doc.Open();
doc.NewPage();
doc.Add(new iTextSharp.text.Paragraph("Hello world"));
doc.Close();
bytes = ms.ToArray();
}
}
}
//Do whatever you want with the byte array here
You don't have to create the byte array if you don't want, I was just showing how to create a PDF and give you something ".net-like" for you to work with.

Answer 2

I was able to get it work finally.
using (var ms = new MemoryStream())
{
using (var document = new Document(PageSize.A4,50,50,15,15))
{
PdfWriter.GetInstance(document, ms);
document.Open();
document.Add(new Paragraph("HelloWorld"));
document.Close();
}
Response.Clear();
//Response.ContentType = "application/pdf";
Response.ContentType = "application/octet-stream";
Response.AddHeader("content-disposition", "attachment;filename= Test.pdf");
Response.Buffer = true;
Response.Clear();
var bytes = ms.ToArray();
Response.OutputStream.Write(bytes, 0, bytes.Length);
Response.OutputStream.Flush();
}

Answer 3

This Works for me.
using (var ms = new MemoryStream())
{
using (var document = new Document(PageSize.A4,50,50,15,15))
{
// step 2
PdfWriter writer = PdfWriter.GetInstance(document, ms);
// step 3
document.Open();
// XML Worker
XMLWorker worker = new XMLWorker(css, true);
XMLParser p = new XMLParser(worker);
p.Parse(new StringReader(--Your HTML--));
// step 5
document.Close();
}
Byte[] FileBuffer = ms.ToArray();
if (FileBuffer != null)
{
Response.ContentType = "application/pdf";
Response.AddHeader("content-length", FileBuffer.Length.ToString());
Response.BinaryWrite(FileBuffer);
}
}