使用C#代码在PDF中添加或删除附件

PM> Install-Package Spire.PDF

using Spire.Pdf;
using Spire.Pdf.Attachments;

namespace AttachFilesToPDF
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建 PdfDocument 对象
            PdfDocument doc = new PdfDocument();

            //加载示例 PDF 文件
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Sample.pdf");

            //基于外部文件创建 PdfAttachment 对象
            PdfAttachment attachment = new PdfAttachment("C:\\Users\\Administrator\\Desktop\\Data.xlsx");

            //将附件添加到 PDF
            doc.Attachments.Add(attachment);

            //保存文档
            doc.SaveToFile("Attachment.pdf");
        }
    }
}

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

namespace AnnotationAttachment
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建 PdfDocument 对象
            PdfDocument doc = new PdfDocument();

            //加载示例 PDF 文件
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Sample.pdf");

            //获取指定页
            PdfPageBase page = doc.Pages[0];

            //在 PDF 上绘制文字标签
            String label = "Here is the report:";
            PdfTrueTypeFont font = new PdfTrueTypeFont(new Font("Arial", 13f, FontStyle.Bold), true); 
            float x = 35;
            float y = doc.Pages[0].ActualSize.Height - 220;
            page.Canvas.DrawString(label, font, PdfBrushes.Red, x, y);

            //基于外部文件创建 PdfAttachmentAnnotation 对象
            String filePath = "C:\\Users\\Administrator\\Desktop\\Report.pptx";
            byte[] data = File.ReadAllBytes(filePath);
            SizeF size = font.MeasureString(label);
            RectangleF bounds = new RectangleF((float)(x + size.Width + 5), (float)y, 10, 15);
            PdfAttachmentAnnotation annotation = new PdfAttachmentAnnotation(bounds, "Report.docx", data);
            annotation.Color = Color.Purple;
            annotation.Flags = PdfAnnotationFlags.Default;
            annotation.Icon = PdfAttachmentIcon.Graph;
            annotation.Text = "Click here to open the file";

            //将注释附件添加到 PDF 页面
            page.AnnotationsWidget.Add(annotation);

            //保存文档
            doc.SaveToFile("Annotation.pdf");
        }
    }
}

using Spire.Pdf;
using Spire.Pdf.Attachments;

namespace RemoveAttachments
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建 PdfDocument 对象
            PdfDocument doc = new PdfDocument();

            //加载 PDF 文件
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Attachment.pdf");

            //获取附件集合
            PdfAttachmentCollection attachments = doc.Attachments;

            //删除指定附件
            attachments.RemoveAt(0);

            //删除所有附件
            //attachments.Clear();

            //保存文件
            doc.SaveToFile("DeleteAttachments.pdf");
        }
    }
}

using Spire.Pdf;
using Spire.Pdf.Annotations;

namespace RemoveAnnotationAttachments
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建 PdfDocument 对象
            PdfDocument doc = new PdfDocument();

            //加载 PDF 文件
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Annotation.pdf");

            //遍历所有页面
            for (int i = 0; i < doc.Pages.Count; i++)
            {
                //获取注释集合
                PdfAnnotationCollection annotationCollection = doc.Pages[i].AnnotationsWidget;

                //遍历注释
                for (int j = 0; j < annotationCollection.Count; j++)
                {
                    //判断当前注释是否为 PdfAttachmentAnnotationWidget 类型
                    if (annotationCollection[j] is PdfAttachmentAnnotationWidget)
                    {
                        //移除注释附件
                        annotationCollection.Remove((PdfAnnotation)annotationCollection[j]);
                    }
                }
            }

            //保存文件
            doc.SaveToFile("DeleteAnnotationAttachments.pdf");
        }
    }
}