c# - 合并带有书签的 pdf 文件

Question

我正在尝试合并很多 pdf，并且我想为每个 pdf 添加一个书签(pdf 的名称)，我发现了合并 pdf 的不同技术，但它们都不能只添加书签，例如。 itextsharp 添加一章，然后是该章的书签，我不想更改 pdf。

Answer 1

使用 itextsharp 你可以做到。我通过以下方法来完成:

MergePdfFiles(string outputPdf, string[] sourcePdfs) {
    PdfReader reader = null;
    Document document = new Document();
    PdfImportedPage page = null;
    PdfCopy pdfCpy = null;
    int n = 0;
    int totalPages = 0;
    int page_offset = 0;
    List < Dictionary < string, object >> bookmarks = new List < Dictionary < string, object >> ();
    IList < Dictionary < string, object >> tempBookmarks;
    for (int i = 0; i <= sourcePdfs.GetUpperBound(0); i++) {
        reader = new PdfReader(sourcePdfs[i]);
        reader.ConsolidateNamedDestinations();
        n = reader.NumberOfPages;
        tempBookmarks = SimpleBookmark.GetBookmark(reader);
        if (i == 0) {
            document = new iTextSharp.text.Document(reader.GetPageSizeWithRotation(1));
            pdfCpy = new PdfCopy(document, new FileStream(outputPdf, FileMode.Create));
            document.Open();
            SimpleBookmark.ShiftPageNumbers(tempBookmarks, page_offset, null);
            page_offset += n;
            if (tempBookmarks != null)
                bookmarks.AddRange(tempBookmarks);
            //  MessageBox.Show(n.ToString());
            totalPages = n;
        } else {
            SimpleBookmark.ShiftPageNumbers(tempBookmarks, page_offset, null);
            if (tempBookmarks != null)
                bookmarks.AddRange(tempBookmarks);
            page_offset += n;
            totalPages += n;
        }
        for (int j = 1; j <= n; j++) {
            page = pdfCpy.GetImportedPage(reader, j);
            pdfCpy.AddPage(page);
        }
        reader.Close();
    }
    pdfCpy.Outlines = bookmarks;
    document.Close();
}