How to Extract and Manage PDF Metadata in .NET

How to Extract and Manage PDF Metadata in .NET

This guide shows how to read and write XMP metadata and work with utility classes in Aspose.PDF FOSS for .NET.

Prerequisites

Read XMP metadata

The Document.Metadata dictionary exposes all XMP properties stored in the PDF. Iterate its entries to inspect standard Dublin Core fields such as dc:title, dc:creator, and xmp:CreateDate, or any custom properties that were previously embedded.

using var doc = Document.Open(pdfBytes);
foreach (var entry in doc.Metadata)
{
    Console.WriteLine($"{entry.Key}: {entry.Value}");
}

Set a custom metadata property

Add or update an XMP property by calling Metadata.Add with a key string and an XmpValue wrapper. Save the document to persist the change.

doc.Metadata.Add("xmp:CustomProp", new XmpValue("value"));
doc.Save("with-metadata.pdf");

Work with rectangles

The Rectangle class represents a bounding box used throughout the library for page geometry, annotation placement, and hit testing. Use ContainsPoint to check whether a coordinate falls inside the rectangle.

var rect = new Rectangle(72, 700, 300, 720);
bool inside = rect.ContainsPoint(150, 710);

Key Classes

See Also

• Metadata and Utilities Developer Guide
• Aspose.PDF for .NET Enterprise Product