元数据和实用工具

using var doc = Document.Open(pdfBytes);

// Read existing metadata
foreach (var entry in doc.Metadata)
{
    Console.WriteLine($"{entry.Key}: {entry.Value}");
}

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

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

// Transformation matrix (translate by 100, 200)
var matrix = new Matrix(1, 0, 0, 1, 100, 200);

using var doc = Document.Open(pdfBytes);

for (int i = 1; i <= doc.Pages.Count; i++)
{
    var page = doc.Pages[i];
}

var images = doc.Pages[1].Resources.Images;
foreach (var img in images)
{
    Console.WriteLine($"Color type: {img.GetColorType()}");
}

var artifact = new Artifact(ArtifactType.Watermark);
artifact.SetPageNumberReplacementString("Page {0}");