// See http://stackoverflow.com/questions/4491156/get-the-export-value-of-a-checkbox-using-itextsharp/
public static string GetExportValue(AcroFields.Item item)
{
var valueDict = item.GetValue(0);
var appearanceDict = valueDict.GetAsDict(PdfName.AP);
if (appearanceDict != null)
{
var normalAppearances = appearanceDict.GetAsDict(PdfName.N);
// /D is for the "down" appearances.
// if there are normal appearances, one key will be "Off", and the other
// will be the export value... there should only be two.
if (normalAppearances != null)
{
foreach (var curKey in normalAppearances.Keys)
if (!PdfName.OFF.Equals(curKey))
return curKey.ToString().Substring(1);
// string will have a leading '/' character, so remove it!
}
}
// if that doesn't work, there might be an /AS key, whose value is a name with
// the export value, again with a leading '/', so remove it!
var curVal = valueDict.GetAsName(PdfName.AS);
if (curVal != null)
return curVal.ToString().Substring(1);
else
return string.Empty;
}
