BookmarksOutlineLevelCollection class

A collection of individual bookmarks outline level.

To learn more, visit the Working with Bookmarks documentation article.

public class BookmarksOutlineLevelCollection : IEnumerable<KeyValuePair<string, int>>


BookmarksOutlineLevelCollection()The default constructor.


Count { get; }Gets the number of elements contained in the collection.
Item { get; set; }Gets or a sets a bookmark outline level by the bookmark name. (2 indexers)


Add(string, int)Adds a bookmark to the collection.
Clear()Removes all elements from the collection.
Contains(string)Determines whether the collection contains a bookmark with the given name.
GetEnumerator()Returns an enumerator object that can be used to iterate over all items in the collection.
IndexOfKey(string)Returns the zero-based index of the specified bookmark in the collection.
Remove(string)Removes a bookmark with the specified name from the collection.
RemoveAt(int)Removes a bookmark at the specified index.


Key is a case-insensitive string bookmark name. Value is a int bookmark outline level.

Bookmark outline level may be a value from 0 to 9. Specify 0 and Word bookmark will not be displayed in the document outline. Specify 1 and Word bookmark will be displayed in the document outline at level 1; 2 for level 2 and so on.


Shows how to set outline levels for bookmarks.

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

// Insert a bookmark with another bookmark nested inside it.
builder.StartBookmark("Bookmark 1");
builder.Writeln("Text inside Bookmark 1.");

builder.StartBookmark("Bookmark 2");
builder.Writeln("Text inside Bookmark 1 and 2.");
builder.EndBookmark("Bookmark 2");

builder.Writeln("Text inside Bookmark 1.");
builder.EndBookmark("Bookmark 1");

// Insert another bookmark.
builder.StartBookmark("Bookmark 3");
builder.Writeln("Text inside Bookmark 3.");
builder.EndBookmark("Bookmark 3");

// When saving to .pdf, bookmarks can be accessed via a drop-down menu and used as anchors by most readers.
// Bookmarks can also have numeric values for outline levels,
// enabling lower level outline entries to hide higher-level child entries when collapsed in the reader.
PdfSaveOptions pdfSaveOptions = new PdfSaveOptions();
BookmarksOutlineLevelCollection outlineLevels = pdfSaveOptions.OutlineOptions.BookmarksOutlineLevels;

outlineLevels.Add("Bookmark 1", 1);
outlineLevels.Add("Bookmark 2", 2);
outlineLevels.Add("Bookmark 3", 3);

Assert.AreEqual(3, outlineLevels.Count);
Assert.True(outlineLevels.Contains("Bookmark 1"));
Assert.AreEqual(1, outlineLevels[0]);
Assert.AreEqual(2, outlineLevels["Bookmark 2"]);
Assert.AreEqual(2, outlineLevels.IndexOfKey("Bookmark 3"));

// We can remove two elements so that only the outline level designation for "Bookmark 1" is left.
outlineLevels.Remove("Bookmark 2");

// There are nine outline levels. Their numbering will be optimized during the save operation.
// In this case, levels "5" and "9" will become "2" and "3".
outlineLevels.Add("Bookmark 2", 5);
outlineLevels.Add("Bookmark 3", 9);

doc.Save(ArtifactsDir + "BookmarksOutlineLevelCollection.BookmarkLevels.pdf", pdfSaveOptions);

// Emptying this collection will preserve the bookmarks and put them all on the same outline level.

See Also