//// This code is part of Document Solutions for PDF .NET demos.// Copyright (c) MESCIUS inc. All rights reserved.//using System.IO;using GrapeCity.Documents.Pdf;
namespace DsPdfWeb.Demos{    // This example shows how to load a password protected PDF without specifying the password,    // and change (reverse) the order of the pages in the PDF.    // The modified PDF is saved and re-opened with the password so that we can show it in the demo.    public class NoPassReversePages    {        public int CreatePDF(Stream stream)        {            using var fsSrc = File.OpenRead(Path.Combine("Resources", "PDFs", "Wetlands-password-user.pdf"));            // Set up DecryptionOptions to allow loading password protected PDFs without password:            var dopt = new DecryptionOptions() { ThrowExceptionIfInvalidPassword = false };            var docSrc = new GcPdfDocument();            docSrc.Load(fsSrc, dopt);
            for (int i = 0; i < docSrc.Pages.Count / 2; ++i)                docSrc.Pages.Swap(i, docSrc.Pages.Count - 1 - i);
            // Demo site specific:            // We save the modified password protected document to a temp file,            // and load it again with the password, so that the demo site can show it            // without asking the user for a password (the block is to delete the temp file):            var fn = Path.GetTempFileName();            {                docSrc.Save(fn);                var doc = new GcPdfDocument();                using var fs = File.OpenRead(fn);                doc.Load(fs, "user");                doc.Save(stream);            }            File.Delete(fn);            return docSrc.Pages.Count;        }    }}