c#/vb.net 获取 pdf 多级书签-凯发线上登陆下载网址

spire.pdf不仅支持，还支持多级书签。本文将介绍如何使用spire.pdf来获取pdf文档中的多级书签。

static void main(string[] args)
{
    //加载含有多级书签的pdf文件
    pdfdocument doc = new pdfdocument();
    doc.loadfromfile("示例.pdf");
    //获取文档的书签
    pdfbookmarkcollection bookmarks = doc.bookmarks;
    //声明一个可变字符串
    stringbuilder stringbuilder = new stringbuilder();
    //获取父书签和子书签           
getbookmarktitle(bookmarks, stringbuilder);
    //声明txt文件，并将获得的多级书签写入到文件.txt
    string filename = "d://文件.txt";
    file.writealltext(filename, stringbuilder.tostring());
    console.readline();
}
static void getbookmarktitle(pdfbookmarkcollection bookmarks, stringbuilder stringbuilder)
  {           
   if (bookmarks.count > 0)
      {
      foreach (pdfbookmark parentbookmark in bookmarks)
        {
           stringbuilder.appendline(parentbookmark.title);
           //递归文档多级书签
           getbookmarktitle(parentbookmark, stringbuilder);            
        }
      }
}

private shared sub main(args as string())
	'加载含有多级书签的pdf文件
	dim doc as new pdfdocument()
	doc.loadfromfile("示例.pdf")
	'获取文档的书签
	dim bookmarks as pdfbookmarkcollection = doc.bookmarks
	'声明一个可变字符串
	dim stringbuilder as new stringbuilder()
	'获取父书签和子书签           
	getbookmarktitle(bookmarks, stringbuilder)
	'声明txt文件，并将获得的多级书签写入到文件.txt
	dim filename as [string] = "d://文件.txt"
	file.writealltext(filename, stringbuilder.tostring())
	console.readline()
end sub
private shared sub getbookmarktitle(bookmarks as pdfbookmarkcollection, stringbuilder as stringbuilder)
	if bookmarks.count > 0 then
		for each parentbookmark as pdfbookmark in bookmarks
			stringbuilder.appendline(parentbookmark.title)
			'递归文档多级书签
			getbookmarktitle(parentbookmark, stringbuilder)
		next
	end if
end sub