iTextSharp.text.pdf.TextField.SetExtraMargin C# (CSharp) Метод

        public void SetExtraMargin(float extraMarginLeft, float extraMarginTop) {
            this.extraMarginLeft = extraMarginLeft;
            this.extraMarginTop = extraMarginTop;
        }

        // Add annotation to PDF using iTextSharp
        private void addTextAnnotationToPDF(string filePath, string contents, int pageNum, int x, int y, int width, int height)
        {
            PdfReader pdfReader = null;
            PdfStamper pdfStamp = null;

            try
            {
                using (var inStream = new FileStream(filePath, FileMode.Open))
                {
                    pdfReader = new PdfReader(inStream);
                }

                using (var outStream = new FileStream(filePath, FileMode.Create))
                {
                    pdfStamp = new PdfStamper(pdfReader, outStream, (char)0, true);

                    var rect = new iTextSharp.text.Rectangle((float)x, (float)y, (float)x + width, (float)y + height);

                    // Generating the annotation's appearance using a TextField
                    TextField textField = new TextField(pdfStamp.Writer, rect, null);
                    textField.Text = contents;
                    textField.FontSize = 8;
                    textField.TextColor = BaseColor.DARK_GRAY;
                    textField.BackgroundColor = new BaseColor(Color.LightGoldenrodYellow);
                    textField.BorderColor = new BaseColor(Color.BurlyWood);
                    textField.Options = TextField.MULTILINE;
                    textField.SetExtraMargin(2f, 2f);
                    textField.Alignment = Element.ALIGN_TOP | Element.ALIGN_LEFT;
                    PdfAppearance appearance = textField.GetAppearance();

                    // Create the annotation
                    PdfAnnotation annotation = PdfAnnotation.CreateFreeText(pdfStamp.Writer, rect, null, new PdfContentByte(null));
                    annotation.SetAppearance(PdfName.N, appearance);
                    annotation.Flags = PdfAnnotation.FLAGS_READONLY | PdfAnnotation.FLAGS_LOCKED | PdfAnnotation.FLAGS_PRINT;
                    annotation.Put(PdfName.NM, new PdfString(Guid.NewGuid().ToString()));

                    // Add annotation to PDF
                    pdfStamp.AddAnnotation(annotation, pageNum);
                    pdfStamp.Close();
                }
            }
            catch (Exception ex)
            {
                throw new Exception("Could not add signature image to PDF with error: " + ex.Message);
            }
        }