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我正在使用 itextsharp 以编程方式生成对 PDF 注释的回复。一切似乎都很好，只是在 Acrobat DC 中生成的回复没有按时间顺序排序。它出现在手动创建的回复上方，即使它有一个较晚的时间戳。请参阅下图，显示它在 Acrobat DC 上的显示方式。

尽管有较晚的时间戳，但自动生成的回复出现在手动回复上方：

尽管有较晚的时间戳，但自动生成的回复出现在手动回复上方

以下是我的代码：

PdfArray originalRect = originalAnnot.GetAsArray(PdfName.RECT);

Rectangle replyRect = new Rectangle(
    originalRect.GetAsNumber(0).FloatValue, originalRect.GetAsNumber(1).FloatValue,
    originalRect.GetAsNumber(2).FloatValue, originalRect.GetAsNumber(3).FloatValue
);

PdfAnnotation replySticky = PdfAnnotation.CreateText(stamper.Writer, replyRect, author, change.ReplyToAdd, true, "Comment");
replySticky.Put(PdfName.IRT, annots.getAsIndirectObject(i));
replySticky.Put(PdfName.CREATIONDATE, new PdfDate(DateTime.Now));
replySticky.Put(PdfName.M, new PdfDate(DateTime.Now));
replySticky.Put(PdfName.AUTHOR, new PdfString(author));
replySticky.Put(PdfName.NM, new PdfString(Guid.NewGuid().ToString()));

replySticky.Put(new PdfName("Subj"), new PdfString("Sticky Note"));
PdfNumber n = originalAnnot.GetAsNumber(PdfName.F);
replySticky.Put(PdfName.F, new PdfNumber(n.IntValue | PdfAnnotation.FLAGS_HIDDEN));

stamper.AddAnnotation(replySticky, page);

我是否缺少某些确定 Acrobat 中显示顺序的属性？谢谢！

更新：关于我如何获得 originalAnnot 的价值存在一个问题。在写入 PDF 之前，我将检索所有现有注释，并将它们存储在字典中，使用的键是页码和注释的 NM 值的组合。这是代码片段：

Dictionary<string, Annotation> annotationMap = new Dictionary<string, Annotation>();

pdfReader = new PdfReader(inputPath, password);

// First pass to read annotations
for (int page = 1; page <= pdfReader.NumberOfPages; page++)
{
    //get the PdfDictionary of the 1st page
    PdfDictionary pageDict = pdfReader.GetPageN(page);

    //get annotation array
    PdfArray annotArray = pageDict.GetAsArray(PdfName.ANNOTS);

    if (annotArray == null)
    {
        continue;
    }

    //iterate through annotation array
    int size = annotArray.Size;
    for (int i = 0; i < size; i++)
    {
        PdfDictionary dict = annotArray.GetAsDict(i);

        string name = getStringFromPDFString(dict.GetAsString(PdfName.NM));
        string author = getStringFromPDFString(dict.GetAsString(PdfName.T));

        if (name != string.Empty && author != string.Empty)
        {
            string contents = getStringFromPDFString(dict.GetAsString(PdfName.CONTENTS));
            string subType = getSubType((PdfName)dict.GetAsName(PdfName.SUBTYPE));
            string moddate = getStringFromPDFString(dict.GetAsString(PdfName.M));
            string state = getStringFromPDFString(dict.GetAsString(PdfName.STATE));
            string inreplyto = getStringFromPDFString(pdfDictionary.GetAsString(PdfName.NM));
            string key = string.Format("{0}={1}", page, name);

            if (annotationMap.ContainsKey(key))
            {
                Console.WriteLine(string.Format("Annotation with duplicate key {0} ignored", key));
                continue;
            }

            string context = string.Empty;
            string highlightedtext = getHighlightText(dict, page, pdfReader, out context);

            Annotation ann = new Annotation(name, moddate, subType, author, page, inputPath, contents, inreplyto, state, context, highlightedtext, dict, annotArray.GetAsIndirectObject(i));
            annotationMap.Add(ann.Identifier, ann);
        }
    } // Each annotation
} // Each page
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