//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//
using System.IO;using System.Linq;using GrapeCity.Documents.Pdf;
namespace DsPdfWeb.Demos{    // This example shows how to remove layers and their content    // from a PDF with multiple layers.    // The input PDF for this sample was created by HousePlanAllLayers.    public class RemoveLayers    {        public int CreatePDF(Stream stream)        {            using var fs = File.OpenRead(Path.Combine("Resources", "PDFs", "house-plan-all-layers.pdf"));            var doc = new GcPdfDocument();            doc.Load(fs);
            // Remove all layers except the last one with their content:            var layers = doc.OptionalContent.Groups.Take(doc.OptionalContent.Groups.Count - 1).ToArray();            doc.OptionalContent.RemoveLayers(true, layers);            // Remove the single remaining layer, leaving its content in place:            doc.OptionalContent.RemoveLayer(doc.OptionalContent.Groups[0]);
            // Save the PDF:            doc.Save(stream);            return doc.Pages.Count;        }    }}