"'System.StackOverflowException" in "OnEndPage" event handler

Question

In the code below, you can see that I overrode OnEndPage event and tried to add a paragraph to the document. However, I get an "System.StackOverflowException" error when attempting to run the code. Does anyone have any idea why this is happening and how can I fix it?

public override void OnEndPage(PdfWriter writer, Document document)
{
    base.OnEndPage(writer, document);
    Paragraph p = new Paragraph("Paragraph");
    document.Add(p);
}

Do you get a stack trace? Does adding a paragraph to the document cause `OnEndPage` to be called again? — Jon Skeet, Jun 18 '14 at 12:26
I'm pretty sure it's because you are adding the paragraph in the onEnd, when you add the paragraph to the doc it must be rewritten, so it calls again onEnd, then you add the paragraph and OnEnd is called and... — Gusman, Jun 18 '14 at 12:33
Nope, can't get a stack trace. And yeah, it seems that onEnd keeps getting called over and over again. — Ognjen Koprivica, Jun 18 '14 at 12:39
I think you would use a `try { } catch { }` and read the Stack Trace of the exception. It would help you to understand the problem. — Afzaal Ahmad Zeeshan, Jun 18 '14 at 12:42

score 2 · Accepted Answer · answered Jun 18 '14 at 12:36

It is forbidden to use document.Add() in a page event. The document object passed as a parameter is actually a PdfDocument object. You should use it for read-only purposes only. This is documented in my book iText in Action - Second Edition.

If you want to add content in the OnEndPage method, you need the writer, for instance writer.DirectContent.

"'System.StackOverflowException" in "OnEndPage" event handler

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