How to toggle the visibility of PDF layer in C#

We have already demonstrated how to use Spire.PDF to add multiple layers to PDF file and delete layer in PDF in C#. We can also toggle the visibility of a PDF layer while creating a new page layer with the help of Spire.PDF. In this section, we're going to demonstrate how to toggle the visibility of layers in new PDF document in C#.

Step 1: Create a new PDF document and add a new page to the PDF document.

PdfDocument pdf = new PdfDocument();
PdfPageBase page = pdf.Pages.Add();

Step 2: Add a layer named "Blue line" to the PDF page and set the layer invisible.

PdfPageLayer layer = page.PageLayers.Add("Blue line", false);
layer.Graphics.DrawLine(new PdfPen(PdfBrushes.Blue, 1), new PointF(0, 30), new PointF(300, 30));

Step 3: Add a layer named "Ellipse" to the PDF page and set the layer visible.

layer = page.PageLayers.Add("Ellipse", true);
PdfPen pen = new PdfPen(Color.Green, 1f);
PdfBrush brush = new PdfSolidBrush(Color.Green);
layer.Graphics.DrawEllipse(pen, brush, 50, 70, 200, 60);

Step 4: Save the document to file.

pdf.SaveToFile("LayerVisibility.pdf", FileFormat.PDF);

Effective screenshot after toggle the visibility of PDF layer:

How to toggle the visibility of PDF layer in C#

Full codes:

using Spire.Pdf;
using Spire.Pdf.Graphics;
using System.Drawing;


namespace LayerVisibility
{
    class Program
    {
        static void Main(string[] args)
        {
            PdfDocument pdf = new PdfDocument();
            PdfPageBase page = pdf.Pages.Add();

            PdfPageLayer layer = page.PageLayers.Add("Blue line", false);
            layer.Graphics.DrawLine(new PdfPen(PdfBrushes.Blue, 1), new PointF(0, 30), new PointF(300, 30));

            layer = page.PageLayers.Add("Ellipse", true);
            PdfPen pen = new PdfPen(Color.Green, 1f);
            PdfBrush brush = new PdfSolidBrush(Color.Green);
            layer.Graphics.DrawEllipse(pen, brush, 50, 70, 200, 60);

            pdf.SaveToFile("LayerVisibility.pdf", FileFormat.PDF);
        }
    }
}