PDFSharp losing annotations

Question

Hello I am using the latest pre release version of PDFSharp and I am concatenating several documents. However, when I add the pages it is losing the annotation. Any idea why?

When I get the file like below, it has the annotation.

PdfDocument inputDocument1 = PdfReader.Open(fromDirectory, PdfDocumentOpenMode.Import);

But, when I go to add it to the overall document, like below, it loses the annotation.

page = outputDocument.AddPage(page);

Any help on this would be greatly appreciated!

Answer 1

事实证明，PDFSharp 1.50.4000-beta 3b有一个错误，因此我备份到1.32.3057版，然后开始工作。

Answer 2

To solve this issue, update this code:

page = outputDocument.AddPage(page);

To:

page = outputDocument.AddPage(page, AnnotationCopyingType.DeepCopy);

This fixed the issue for me.