继续使用 DocNET： https://github.com/GowenGit/docnet

Nuget:

Install-Package Docnet.Core

切分 PDF

注意，DocNET 的 Split 方法的索引是从 0 开始的，所以我们认为的获取 PDF 的第三到第五页，在 DocNET 的 Split 方法其实是从第二到第四页…

        public static bool SplitPdf(string inputPath,int pageFrom,int pageTo, string outputPath)
        {
            bool result = false;

            try
            {
                using (var docnet = DocLib.Instance)
                {
                    var bytes = docnet.Split(inputPath, pageFrom - 1, pageTo - 1);

                    File.WriteAllBytes(outputPath, bytes);
                }

                result = true;
            }
            catch (Exception e)
            {
                Console.WriteLine($"error:{e}");
            }

            return result;
        }

调用下看看效果：

        public IActionResult Index()
        {
            bool result = PdfHelper.SplitPdf("F:\\pdf\\compressed.tracemonkey-pldi-09.pdf",3,5, "F:\\pdf\\compressed.tracemonkey-pldi-10.pdf");
            return Content(result.ToString());
        }

合并PDF

合并就比较简单

        public static bool MergePdf(string inputPath1, string inputPath2, string outputPath)
        {
            bool result = false;

            try
            {
                using (var docnet = DocLib.Instance)
                {
                    var bytes = docnet.Merge(inputPath1, inputPath2);

                    File.WriteAllBytes(outputPath, bytes);
                }

                result = true;
            }
            catch (Exception e)
            {
                Console.WriteLine($"error:{e}");
            }

            return result;
        }