ItextSharp合并

Question

如何将几个pdf页面合并成一个与iTextSharp同时支持合并具有表单元素(如textboxes、checkboxes等)的页面。

我已经通过谷歌搜索尝试过这么多次，但是没有什么效果很好。

Answer 1

请看我在这里的回答，合并内存流。我给出了一个如何将PDF与itextsharp合并的例子。

要更新表单字段名，请添加使用标记更改表单字段名的代码。

/// <summary>
/// Merges pdf files from a byte list
/// </summary>
/// <param name="files">list of files to merge</param>
/// <returns>memory stream containing combined pdf</returns>
public MemoryStream MergePdfForms(List<byte[]> files)
{
    if (files.Count > 1)
    {
        string[] names;
        PdfStamper stamper;
        MemoryStream msTemp = null;
        PdfReader pdfTemplate = null;
        PdfReader pdfFile;
        Document doc;
        PdfWriter pCopy;
        MemoryStream msOutput = new MemoryStream();

        pdfFile = new PdfReader(files[0]);

        doc = new Document();
        pCopy = new PdfSmartCopy(doc, msOutput);
        pCopy.PdfVersion = PdfWriter.VERSION_1_7;

        doc.Open();

        for (int k = 0; k < files.Count; k++)
        {
            for (int i = 1; i < pdfFile.NumberOfPages + 1; i++)
            {
                msTemp = new MemoryStream();
                pdfTemplate = new PdfReader(files[k]);

                stamper = new PdfStamper(pdfTemplate, msTemp);

                names = new string[stamper.AcroFields.Fields.Keys.Count];
                stamper.AcroFields.Fields.Keys.CopyTo(names, 0);
                foreach (string name in names)
                {
                    stamper.AcroFields.RenameField(name, name + "_file" + k.ToString());
                }

                stamper.Close();
                pdfFile = new PdfReader(msTemp.ToArray());
                ((PdfSmartCopy)pCopy).AddPage(pCopy.GetImportedPage(pdfFile, i));
                pCopy.FreeReader(pdfFile);
            }
        }

        pdfFile.Close();
        pCopy.Close();
        doc.Close();

        return msOutput;
    }
    else if (files.Count == 1)
    {
        return new MemoryStream(files[0]);
    }

    return null;
}

Answer 2

以下是乔纳森合并代码的简化版本，添加了名称空间，并删除了加盖印章。

public IO.MemoryStream MergePdfForms(System.Collections.Generic.List<byte[]> files)
{
    if (files.Count > 1) {
        using (System.IO.MemoryStream msOutput = new System.IO.MemoryStream()) {
            using (iTextSharp.text.Document doc = new iTextSharp.text.Document()) {
                using (iTextSharp.text.pdf.PdfSmartCopy pCopy = new iTextSharp.text.pdf.PdfSmartCopy(doc, msOutput) { PdfVersion = iTextSharp.text.pdf.PdfWriter.VERSION_1_7 }) {
                    doc.Open();
                    foreach (byte[] oFile in files) {
                        using (iTextSharp.text.pdf.PdfReader pdfFile = new iTextSharp.text.pdf.PdfReader(oFile)) {
                            for (i = 1; i <= pdfFile.NumberOfPages; i++) {
                                pCopy.AddPage(pCopy.GetImportedPage(pdfFile, i));
                                pCopy.FreeReader(pdfFile);
                            }
                        }
                    }
                }
            }

            return msOutput;
        }
    } else if (files.Count == 1) {
        return new System.IO.MemoryStream(files[0]);
    }

    return null;
}

Answer 3

要合并PDF，参见"使用itextsharp将两个pdf页面合并为一个“