iTextSharp - 合并一批PDF字节数组

Question

我正在使用iTextSharp填写pdf上的几个字段。我需要能够将一系列这些pdf组合成一个批处理的pdf文件。下面我循环一个SQL结果集，用对应于当前记录的值填充pdf的字段，将其存储为字节数组，并将所有这些字段合并到字节数组列表中。然后我尝试将该列表中的merge each byte array转换为单字节数组，并将其作为pdf提供给用户。

它似乎工作，生成一个单独的文件，可能包含与我的结果集中一样多的单个页面，但每个页面上的所有字段都是空白的。当使用FillForm（）来提供单个pdf时，它按预期工作。我究竟做错了什么？

byte[] pdfByteArray = new byte[0]; 
List<byte[]> pdfByteArrayList = new List<byte[]>();
byte[] pdfByteArrayItem = new byte[0];

foreach (DataRow row in results.Rows)
{
    certNum = row[1].ToString();
    certName = row[2].ToString();
    certDate = row[3].ToString();
    pdfByteArrayItem = FillForm(certType, certName, certNum, certDate);
    pdfByteArrayList.Add(pdfByteArrayItem);

}

using (var ms = new MemoryStream()) {
    using (var doc = new Document()) {
        using (var copy = new PdfSmartCopy(doc, ms)) {
            doc.Open();

            //Loop through each byte array
            foreach (var p in pdfByteArrayList) {

                //Create a PdfReader bound to that byte array
                using (var reader = new PdfReader(p)) {

                    //Add the entire document instead of page-by-page
                    copy.AddDocument(reader);
                }
            }

            doc.Close();
        }
    }

pdfByteArray = ms.ToArray();
context.Response.ContentType = "application/pdf";
context.Response.BinaryWrite(pdfByteArray);
context.Response.Flush();
context.Response.End();

private byte[] FillForm(string certType, string certName, string certNum, string certDate)
{
    string pdfTemplate = string.Format(@"\\filePath\{0}.pdf", certType);

    PdfReader pdfReader = new PdfReader(pdfTemplate);

    MemoryStream stream = new MemoryStream();
    PdfStamper pdfStamper = new PdfStamper(pdfReader, stream);

    AcroFields pdfFormFields = pdfStamper.AcroFields;

    // set form pdfFormFields
    pdfFormFields.SetField("CertName", certName);
    pdfFormFields.SetField("CertNum", certNum);
    pdfFormFields.SetField("CertDate", certDate);

    // flatten the form to remove editting options, set it to false
    // to leave the form open to subsequent manual edits
    pdfStamper.FormFlattening = false;

    // close the pdf
    pdfStamper.Close();
    stream.Flush();
    stream.Close();

    byte[] pdfByte = stream.ToArray();

    return pdfByte;
}

Answer 1

设置字段值后添加下面的行似乎修复了它：

pdfFormFields.GenerateAppearances = true;