以编程方式允许PDF保存

Question

我以编程方式填充使用Livecycle创建的PDF（以及通过Adobe Acrobat扩展的功能）。填充字段后，我想允许用户编辑和保存。

private void XMLFieldPopulate(PdfReader reader, Dictionary<string, string> listOfValues, PdfStamper stamper)
    {
        AcroFields form = reader.AcroFields;
        XfaForm xfaform = form.Xfa;
        XmlNode node = xfaform.DatasetsNode;
        XmlNodeList list = node.ChildNodes;

        do
        {
            node = list.Item(0);
            list = node.ChildNodes;
        } while (node.Name != "topmostSubform");

        for (int i = 0; i < list.Count; i++)
        {

            string attribute = list[i].Name;
            string value = string.Empty;

            value = listOfValues.First(x => x.Key == attribute).Value;
                list[i].InnerText = value;
        }

        xfaform.FillXfaForm(node);
        xfaform.SetXfa(stamper.Writer);

我可以填充PDF并进行编辑，但不允许保存。