static List <string> GetRadioGroupCheckedAppearanceNames(PdfDocumentProcessor processor, string fieldName)
{
if (processor.Document == null || processor.Document.AcroForm == null)
{
return(null);
}
PdfInteractiveFormField button = FindRadioButton(processor.Document.AcroForm.Fields, "", fieldName);
if (button != null)
{
List <string> result = new List <string>();
foreach (PdfInteractiveFormField kid in button.Kids)
{
if (kid.Widget != null && kid.Widget.Appearance != null)
{
List <string> names = kid.Widget.Appearance.Down.Forms.Keys.ToList();
if (names.Count == 1)
{
result.Add(names[0]);
}
if (names.Count > 1)
{
if (names[0] == "Off")
{
result.Add(names[1]);
}
else
{
result.Add(names[0]);
}
}
}
}
return(result);
}
return(null);
}
static PdfInteractiveFormField FindRadioButton(IEnumerable <PdfInteractiveFormField> fields, string partialName, string fieldName)
{
foreach (PdfInteractiveFormField field in fields)
{
if (partialName + field.Name == fieldName)
{
if (field.Flags.HasFlag(PdfInteractiveFormFieldFlags.Radio))
{
return(field as PdfButtonFormField);
}
return(null);
}
if (field.Kids != null)
{
PdfInteractiveFormField intermediateResult = FindRadioButton(field.Kids, partialName + "." + field.Name, fieldName);
if (intermediateResult != null)
{
return(intermediateResult);
}
}
}
return(null);
}