iTextSharp retain named destinations and bookmarks after writing a new document - pdf

Question

I have a method that fixes my document so it opens on Page Level Zoom, the bookmarks are retained but I can't seem to keep my named destinations (anchors) in my new document. I commented in my method what I thought would fix the problem, I used the code before in another method.
private static void FixZoom(string source)
{
var reader = new PdfReader(new FileStream(source, FileMode.Open, FileAccess.Read));
var size = reader.GetPageSizeWithRotation(1);
using (var document = new iTextSharp.text.Document(size))
{
var path = String.Empty;
var dirName = Path.GetDirectoryName(source);
if (dirName != null)
{
path = Path.Combine(dirName, "Zoom" + Path.GetFileName(source));
}
using (var stream = new FileStream(path, FileMode.Create, FileAccess.ReadWrite))
{
using (var writer = PdfWriter.GetInstance(document, stream))
{
document.Open();
var bookmarks = SimpleBookmark.GetBookmark(reader);
var cb = writer.DirectContent;
var pdfDest = new PdfDestination(PdfDestination.FIT);
var action = PdfAction.GotoLocalPage(1, pdfDest, writer);
for (var pageNumber = 1; pageNumber <= reader.NumberOfPages; pageNumber++)
{
document.SetPageSize(reader.GetPageSizeWithRotation(pageNumber));
document.NewPage();
var page = writer.GetImportedPage(reader, pageNumber);
cb.AddTemplate(page, 0, 0);
}
//BEGIN: This is not working
var map = SimpleNamedDestination.GetNamedDestination(reader, false);
if (map.Count > 0)
{
writer.AddNamedDestinations(map, reader.NumberOfPages);
}
//END: This is not working
var pageMode = 0;
pageMode += PdfWriter.PageLayoutOneColumn;
writer.SetOpenAction(action);
writer.ViewerPreferences = pageMode;
writer.Outlines = bookmarks;
document.Close();
}
}
File.Delete(source);
File.Move(path, source);
}
}
After the comment I fixed it with this code.
private static void FixZoom(string source)
{
var reader = new PdfReader(new FileStream(source, FileMode.Open, FileAccess.Read));
var size = reader.GetPageSizeWithRotation(1);
using (var document = new iTextSharp.text.Document(size))
{
var path = String.Empty;
var dirName = Path.GetDirectoryName(source);
if (dirName != null)
{
path = Path.Combine(dirName, "Zoom" + Path.GetFileName(source));
}
using (var stream = new FileStream(path, FileMode.Create, FileAccess.ReadWrite))
{
using (var stamper = new PdfStamper(reader, stream))
{
document.Open();
var pdfDestination = new PdfDestination(PdfDestination.FIT);
var pdfAction = PdfAction.GotoLocalPage(1, pdfDestination, stamper.Writer);
stamper.Writer.SetOpenAction(pdfAction);
document.Close();
}
}
File.Delete(source);
File.Move(path, source);
}
}