C＃/ PdfSharp：从书签条目中找出页码并拆分

尝试处理PDF文件并使用使用PDFSharp定义的书签将其拆分，虽然我可以获得书签列表，但我无法弄清楚如何实际找出与书签定义相对应的页码 .

我正在使用的示例PDF文件在第1,5和6页上定义了三个顶级书签，虽然我可以看到带有下面代码段的书签，但我无法找到将书签映射到页码的方法 .

码：

using (PdfDocument document = PdfReader.Open("test.pdf", PdfDocumentOpenMode.Import))
{
    PdfDictionary outline = document.Internals.Catalog.Elements.GetDictionary("/Outlines");

    Console.WriteLine("Page count: " + document.PageCount);

    foreach(var page in document.Pages)
    {
        // any hierarchy info on the page itself? doesn't seem to have any.
        Console.WriteLine(page.ToString());

    }

    for (PdfDictionary child = outline.Elements.GetDictionary("/First"); child != null; child = child.Elements.GetDictionary("/Next"))
    {
        Console.WriteLine(child.Elements.GetString("/Title"));

        // FIXME: get page numbers?

    }

}

输出：

Page count: 9
<< /Contents [ 1019 0 R ] /Group << /CS /DeviceRGB /S /Transparency >> /MediaBox [ 0 0 3874 2667 ] /Parent 1 0 R /Resources 1018 0 R /Type /Page >>
<< /Contents [ 1022 0 R ] /Group << /CS /DeviceRGB /S /Transparency >> /MediaBox [ 0 0 3874 2667 ] /Parent 1 0 R /Resources 1021 0 R /Type /Page >>
<< /Contents [ 1025 0 R ] /Group << /CS /DeviceRGB /S /Transparency >> /MediaBox [ 0 0 3874 2667 ] /Parent 1 0 R /Resources 1024 0 R /Type /Page >>
<< /Contents [ 1028 0 R ] /Group << /CS /DeviceRGB /S /Transparency >> /MediaBox [ 0 0 3874 2667 ] /Parent 1 0 R /Resources 1027 0 R /Type /Page >>
<< /Contents [ 1032 0 R ] /Group << /CS /DeviceRGB /S /Transparency >> /MediaBox [ 0 0 842 595 ] /Parent 1 0 R /Resources 1031 0 R /Type /Page >>
<< /Annots [ 46 0 R 48 0 R 50 0 R 52 0 R 54 0 R 56 0 R 58 0 R 60 0 R 62 0 R 64 0 R 66 0 R 68 0 R 70 0 R 72 0 R 74 0 R ] /Contents [ 1043 0 R ] /Group << /CS /DeviceRGB /S /Transparency >> /MediaBox [ 0 0 1130 799 ] /Parent 1 0 R /Resources 1042 0 R /Type /Page >>
<< /Annots [ 82 0 R 84 0 R 86 0 R 88 0 R 90 0 R 92 0 R 94 0 R 96 0 R 98 0 R 100 0 R 102 0 R 104 0 R 106 0 R 108 0 R 110 0 R 112 0 R 114 0 R 116 0 R 118 0 R 120 0 R 122 0 R 124 0 R 126 0 R 128 0 R 130 0 R 132 0 R 134 0 R 136 0 R 138 0 R 140 0 R 142 0 R 144 0 R 146 0 R 148 0 R 150 0 R 152 0 R 154 0 R 156 0 R 158 0 R ] /Contents [ 1048 0 R ] /Group << /CS /DeviceRGB /S /Transparency >> /MediaBox [ 0 0 1130 799 ] /Parent 1 0 R /Resources 1047 0 R /Type /Page >>
<< /Annots [ 166 0 R 168 0 R 170 0 R 172 0 R 174 0 R 176 0 R 178 0 R 180 0 R 182 0 R ] /Contents [ 1053 0 R ] /Group << /CS /DeviceRGB /S /Transparency >> /MediaBox [ 0 0 1130 799 ] /Parent 1 0 R /Resources 1052 0 R /Type /Page >>
<< /Annots [ 190 0 R 192 0 R 194 0 R 196 0 R ] /Contents [ 1058 0 R ] /Group << /CS /DeviceRGB /S /Transparency >> /MediaBox [ 0 0 1130 799 ] /Parent 1 0 R /Resources 1057 0 R /Type /Page >>
Bookmark 1
Bookmark 2 
Bookmark 3

我不一定和PDFSharp库结婚 .

有什么指针吗？谢谢！