C# 添加、获取及删除PDF附件

//加载PDF文档
PdfDocument pdf = new PdfDocument("Test.pdf");

加载需要附加的文档
PdfAttachment attachment = new PdfAttachment(New.pdf);
将文档添加到原PDF文档的附件集合中
pdf.Attachments.Add(attachment);

保存文档
pdf.SaveToFile(Attachment1.pdf");

namespace Spire.Pdf.Annotations
{
     Summary:
         Represents an attachment annotation.
    public class PdfAttachmentAnnotation : PdfFileAnnotation
    {
        //
         Parameters:
           rectangle:
             Bounds of the annotation.
           fileName:
             A string value specifying the full path to the file to be embedded in the
             PDF file.
        public PdfAttachmentAnnotation(RectangleF rectangle,string fileName);
             PDF file.
           data:
             A byte array specifying the content of the annotation's embedded file.
         Remarks:
             If both FileName and FileContent are specified,the FileContent takes precedence.
        string fileName,1)">byte[] data);
             The rectangle.
           stream:
             The stream specifying the content of the annotation's embedded file.
         fileName,Stream stream);

        override string FileName { get; set; }
         Summary:
             Gets or Sets attachment's icon.
        public PdfAttachmentIcon Icon { ; }

        protected void Initialize();
         Save();
    }
}

加载PDF文档
PdfDocument doc = 给文档添加一个新页面
PdfPageBase page = doc.Pages.Add();

添加文本到页面
PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font(Arial,16f,System.Drawing.FontStyle.Bold));
page.Canvas.DrawString(Attachments:",font1,PdfBrushes.CornflowerBlue,1)">new Point(50,50));

将文档作为注释添加到页面
PdfTrueTypeFont font2 = new PointF(52,1)">80);
String label = Report.docx;
byte[] data = File.ReadAllBytes();
SizeF size = font2.MeasureString(label);
RectangleF bounds = new RectangleF(location,size);
page.Canvas.DrawString(label,font2,PdfBrushes.MediumPurple,bounds);
bounds = new RectangleF(bounds.Right + 3,bounds.Top,font2.Height / 2new PdfAttachmentAnnotation(bounds,data);
annotation1.Color = Color.Purple;
annotation1.Flags = PdfAnnotationFlags.NoZoom;
annotation1.Icon = PdfAttachmentIcon.Graph;
annotation1.Text = ;
(page as PdfNewPage).Annotations.Add(annotation1);

保存文档
doc.SaveToFile(Attachment2.pdf");

获取文档的第一个文件附件
PdfAttachment attachment = pdf.Attachments[0];

获取该附件的信息
Console.WriteLine(Name: {0}MimeType: {0}Description: {0}Creation Date: {0}Modification Date: {0}将附件的数据写入到新文档
File.WriteAllBytes(attachment.FileName,attachment.Data);
Console.ReadKey();

实例化一个list并将文档内所有页面的Attachment annotations添加到该list
List<PdfAttachmentAnnotationWidget> attaches = new List<PdfAttachmentAnnotationWidget>();
foreach (PdfPageBase page in pdf.Pages)
{
    foreach (PdfAnnotation annotation  page.AnnotationsWidget)
    {
        attaches.Add(annotation  PdfAttachmentAnnotationWidget);
    }
}

遍历list，将附件数据写入到新文档
for (int i = 0; i < attaches.Count; i++)
{
    File.WriteAllBytes(attaches[i].FileName,attaches[i].Data);
}

删除文档的所有文件附件
0; i < pdf.Attachments.Count; i++)
{
    pdf.Attachments.RemoveAt(i);
} 

Remove.pdf");

删除文档的所有注释附件
0; i < page.AnnotationsWidget.Count; i++)
    {
        PdfAnnotation annotation = page.AnnotationsWidget[i]  PdfAttachmentAnnotationWidget;

        page.AnnotationsWidget.Remove(annotation);                   
    }
}

Result.pdf");