iTextSharp.text.pdf.PdfAnnotation.IsAnnotation C# (CSharp) Метод

        public bool IsAnnotation()
        {
            return annotation;
        }

 internal void AddAnnotation(PdfAnnotation annot, PdfDictionary pageN) {
     List<PdfAnnotation> allAnnots = new List<PdfAnnotation>();
     if (annot.IsForm()) {
         fieldsAdded = true;
         GetAcroFields();
         PdfFormField field = (PdfFormField)annot;
         if (field.Parent != null)
             return;
         ExpandFields(field, allAnnots);
     }
     else
         allAnnots.Add(annot);
     for (int k = 0; k < allAnnots.Count; ++k) {
         annot = allAnnots[k];
         if (annot.PlaceInPage > 0)
             pageN = reader.GetPageN(annot.PlaceInPage);
         if (annot.IsForm()) { 
             if (!annot.IsUsed()) {
                 HashSet2<PdfTemplate> templates = annot.GetTemplates();
                 if (templates != null)
                     fieldTemplates.AddAll(templates);
             }
             PdfFormField field = (PdfFormField)annot;
             if (field.Parent == null)
                 AddDocumentField(field.IndirectReference);
         }
         if (annot.IsAnnotation()) {
             PdfObject pdfobj = PdfReader.GetPdfObject(pageN.Get(PdfName.ANNOTS), pageN);
             PdfArray annots = null;
             if (pdfobj == null || !pdfobj.IsArray()) {
                 annots = new PdfArray();
                 pageN.Put(PdfName.ANNOTS, annots);
                 MarkUsed(pageN);
             }
             else 
                annots = (PdfArray)pdfobj;
             annots.Add(annot.IndirectReference);
             MarkUsed(annots);
             if (!annot.IsUsed()) {
                 PdfRectangle rect = (PdfRectangle)annot.Get(PdfName.RECT);
                 if (rect != null && (rect.Left != 0 || rect.Right != 0 || rect.Top != 0 || rect.Bottom != 0)) {
                     int rotation = reader.GetPageRotation(pageN);
                     Rectangle pageSize = reader.GetPageSizeWithRotation(pageN);
                     switch (rotation) {
                         case 90:
                             annot.Put(PdfName.RECT, new PdfRectangle(
                                 pageSize.Top - rect.Top,
                                 rect.Right,
                                 pageSize.Top - rect.Bottom,
                                 rect.Left));
                             break;
                         case 180:
                             annot.Put(PdfName.RECT, new PdfRectangle(
                                 pageSize.Right - rect.Left,
                                 pageSize.Top - rect.Bottom,
                                 pageSize.Right - rect.Right,
                                 pageSize.Top - rect.Top));
                             break;
                         case 270:
                             annot.Put(PdfName.RECT, new PdfRectangle(
                                 rect.Bottom,
                                 pageSize.Right - rect.Left,
                                 rect.Top,
                                 pageSize.Right - rect.Right));
                             break;
                     }
                 }
             }
         }
         if (!annot.IsUsed()) {
             annot.SetUsed();
             AddToBody(annot, annot.IndirectReference);
         }
     }
 }