Class PdfAnnotationCollection

Manages the collection of annotations (sticky notes, comments) in a PDF document. Supports adding, removing, and iterating through annotations across all pages.

Access via Annotations property. Changes to the collection are automatically synchronized with the PDF document.

Example - Work with annotations:

var pdf = PdfDocument.FromFile("document.pdf");
// Add annotation to first page:
var note = new TextAnnotation(0)
{
Title = "Review Note",
Contents = "Please verify this section",
X = 100,
Y = 700
};
pdf.Annotations.Add(note);
// List all annotations:
foreach (var annotation in pdf.Annotations)
Console.WriteLine($"Page {annotation.PageIndex}: {annotation.Contents}");
// Remove annotations from page 2:
pdf.Annotations.RemoveAllAnnotationsForPage(1);
// Clear all annotations:
pdf.Annotations.Clear();
pdf.SaveAs("annotated.pdf");

Inheritance

System.Object

PdfAnnotationCollection

Namespace: IronPdf.Annotations

Assembly: IronPdf.dll

Syntax

public class PdfAnnotationCollection : ObservableCollection<IAnnotation>

Remarks

Supported Operations:

Related Resources:

Methods

ClearItems()

Override Clear() with Interop RemoveAnnotation() through every annotations in the collection.

Declaration

protected override void ClearItems()

RemoveAllAnnotationsForPage(Int32)

Removes all annotations from a specific page of the PDF document.

Example:

// Remove annotations from page 3 (index 2):
pdf.Annotations.RemoveAllAnnotationsForPage(2);
// Remove annotations from all pages:
for (int i = 0; i < pdf.PageCount; i++)
pdf.Annotations.RemoveAllAnnotationsForPage(i);

Declaration

public void RemoveAllAnnotationsForPage(int pageIndex)

Parameters

Type	Name	Description
System.Int32	pageIndex	Zero-based page index (Page 1 = index 0).

See Also

TextAnnotation

Annotations