/// <summary>
/// Initialize the PDF signature field.
/// </summary>
private void InitSignatureField(PdfStamper stamper)
{
if (_acroFieldsWorker.HasSignatureField(SignatureFieldName))
{
_signatureAppearance.SetVisibleSignature(SignatureFieldName);
}
else
{
if (!string.IsNullOrWhiteSpace(SignatureFieldName) &&
_acroFieldsWorker.HasField(SignatureFieldName))
{
var textField = _acroFieldsWorker.FieldLocationByName(SignatureFieldName);
_signatureAppearance.SetVisibleSignature(
textField.Rectangle, textField.Page,
_signatureAppearance.GetNewSigName()
);
stamper.FormFlattening = true;
stamper.PartialFormFlattening(SignatureFieldName);
}
else if (SignatureBox != null)
{
_signatureAppearance.SetVisibleSignature(
SignatureBox,
// reader.NumberOfPages,
1,
_signatureAppearance.GetNewSigName()
);
stamper.FormFlattening = true;
// stamper.PartialFormFlattening(SignatureFieldName);
}
else
{
throw new InvalidOperationException("field does not exist");
}
}
}
