使用itextsharp解析PDF文档 - 缺少展平的表单字段值

I create a PDF file by using a template and filling in the form fields. I then flatten the PDF to prevent changes to it. I now have a need to parse the PDF's and get the data from the form fields; however, when I parse the PDF the text where the form field was is missing. It seems I can't reference the field because the PDF was flattened AND parsing the PDF skips the fields where the text was and returnsI create a PDF file by using a template and fil