PDFsharp & MigraDoc Forum

        public void DrawAppearance(XGraphics gfx, XRect rect)
        {
            var font = new XFont("Times New Roman", 7.0, XFontStyleEx.Regular);
            var textFormatter = new PdfSharp.Drawing.Layout.XTextFormatter(gfx);
            double signatureHeight = rect.Height * .4;
            var point = new XPoint(rect.Width / 10, rect.Height / 10);
            point = new XPoint(point.X, rect.Height / 2d);
            textFormatter.DrawString("testsign", font, XBrushes.Black, new XRect(point.X, point.Y, rect.Width, rect.Height - point.Y), XStringFormats.TopLeft);
        }

   PdfDocument document = PdfReader.Open(filetoBeSigned);


                var options = new DigitalSignatureOptions
                {
                    ContactInfo = "jhon",
                    Location = "Seattle",
                    Reason = "License Agreement",
                    Rectangle = new(XUnit.FromCentimeter(1).Point, XUnit.FromCentimeter(0).Point,
                        XUnit.FromCentimeter(9.9).Point, XUnit.FromCentimeter(1.3).Point),
                    AppearanceHandler = new SignatureAppearanceHandler()
                };
                var pdfSignatureHandler = DigitalSignatureHandler.ForDocument(document, new PdfSharpDefaultSigner(certificate, PdfMessageDigestType.SHA256), options);