ABCpdf .NET PDF Component Documentation - Objects Eof Load Function. Loads the file trailer data.

The following code tests to see if any of the revisions in a document are hybrid.

bool isHybrid = false;
using var doc = new Doc();
doc.Read(Server.MapPath("../mypics/sample.pdf"));
using (var eof = new ObjectSoup.Eof()) {
  eof.Load(doc.ObjectSoup);
  var xref = eof.XRef;
  while (xref != null) {
    if (xref.Type == ObjectSoup.XRefType.Hybrid) {
      isHybrid = true;
      break;
    }
    xref = xref.Prev;
  }
}
// do something with isHybrid

Dim isHybrid As Boolean = False
Using doc = New Doc()
  doc.Read(Server.MapPath("../mypics/sample.pdf"))
  Using eof = New ObjectSoup.Eof()
    eof.Load(doc.ObjectSoup)
    Dim xref = eof.XRef
    While xref <> Nothing
      If xref.Type = ObjectSoup.XRefType.Hybrid Then
        isHybrid = True
        Exit While
      End If
      xref = xref.Prev
    End While
    ' do something with isHybrid
  End Using
End Using