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