PeachPDF
PeachPDF.Layout.ITextSpanContainer
ITextSpanContainer.CurrentPageNumber() Method
Appends the current page number. Only resolves inside Header(Action<IContainer>)/ Footer(Action<IContainer>) content - elsewhere it renders as an empty span, since a page number has no meaning outside repeating per-page content.
PeachPDF.Layout.ITextSpan CurrentPageNumber();