大纲和书签
PDF大纲或“书签”为导航至PDF的关键页面提供了一种方式。 在Adobe Acrobat阅读器中，这些书签(可嵌套)显示在应用程序左侧边栏中。 IronPDF将从PDF文档中导入现有书签，并允许添加、编辑和嵌套更多书签。
using IronPdf;
// Create a new PDF or edit an existing document.
var pdf = PdfDocument.FromFile("existing.pdf");
// Add bookmark
pdf.Bookmarks.AddBookMarkAtEnd("Author's Note", 2);
pdf.Bookmarks.AddBookMarkAtEnd("Table of Contents", 3);
// Store new bookmark in a variable to add nested bookmarks to
var summaryBookmark = pdf.Bookmarks.AddBookMarkAtEnd("Summary", 17);
// Add a sub-bookmark within the summary
var conclusionBookmark = summaryBookmark.Children.AddBookMarkAtStart("Conclusion", 18);
// Add another bookmark to end of highest-level bookmark list
pdf.Bookmarks.AddBookMarkAtEnd("References", 20);
// Remove bookmark example
pdf.Bookmarks.RemoveBookMark(summaryBookmark);
pdf.SaveAs("existing.pdf");Imports IronPdf
' Create a new PDF or edit an existing document.
Private pdf = PdfDocument.FromFile("existing.pdf")
' Add bookmark
pdf.Bookmarks.AddBookMarkAtEnd("Author's Note", 2)
pdf.Bookmarks.AddBookMarkAtEnd("Table of Contents", 3)
' Store new bookmark in a variable to add nested bookmarks to
Dim summaryBookmark = pdf.Bookmarks.AddBookMarkAtEnd("Summary", 17)
' Add a sub-bookmark within the summary
Dim conclusionBookmark = summaryBookmark.Children.AddBookMarkAtStart("Conclusion", 18)
' Add another bookmark to end of highest-level bookmark list
pdf.Bookmarks.AddBookMarkAtEnd("References", 20)
' Remove bookmark example
pdf.Bookmarks.RemoveBookMark(summaryBookmark)
pdf.SaveAs("existing.pdf")
