C#/VB.NET如何添加、获取、删除PDF附件

概述

附件，指随同文件发出的有关文件或物品。在PDF文档中，我们可以添加同类型的或其他类型的文档作为附件内容，而PDF中附件也可以分为两种存在形式，一种是附件以普通文件形式存在，另一种是以注释的形式存在。在下面的示例中介绍了如何分别添加以上两种形式的PDF附件。此外，根据PDF附件的不同添加方式，我们在获取PDF附件信息或删除PDF附件时，也可以分情况来执行操作。

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要点索引

1.添加PDF附件
1.1 以普通文档形式添加附件
1.2 以文档注释形式添加附件
2.获取PDF附件
2.1 获取文件附件
2.2 获取注释附件
3.删除PDF附件
3.1 删除文件附件
3.2 删除注释附件

工具使用

Spire.PDF for .NET 4.0

示例操作

1.添加PDF附件

1.1 以普通文档形式添加附件

Csharp

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

namespace AddAttachment_PDF
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建一个PdfDocument类对象，加载测试文档
            PdfDocument pdf = new PdfDocument();
            pdf.LoadFromFile("sample.pdf");

            //初始化PdfAttachment类实例，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);

            //保存并打开文档
            pdf.SaveToFile("Attachment1.pdf");
            System.Diagnostics.Process.Start("Attachment1.pdf");
        }
    }
}

测试结果：

VB.NET

Imports Spire.Pdf
Imports Spire.Pdf.Attachments

Namespace AddAttachment_PDF

    Class Program

        Private Shared Sub Main(ByVal args As String())
            Dim pdf As PdfDocument = New PdfDocument()
            pdf.LoadFromFile("sample.pdf")
            Dim attachment As PdfAttachment = New PdfAttachment("New.pdf")
            pdf.Attachments.Add(attachment)
            pdf.SaveToFile("Attachment1.pdf")
            System.Diagnostics.Process.Start("Attachment1.pdf")
        End Sub
    End Class
End Namespace

1.2 以文档注释形式添加附件

Csharp

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

namespace AddAttachment2
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建一个PdfDocument类对象，加载测试文档
            PdfDocument doc = new PdfDocument("sample.pdf");
            //给添加一个新页面到文档
            PdfPageBase page = doc.Pages.Add();

            //添加文本到页面，并设置文本格式（字体、题号、字体粗细、颜色、文本位置等）
            PdfTrueTypeFont font1 = new PdfTrueTypeFont(new Font("Arial", 16f, System.Drawing.FontStyle.Bold));
            page.Canvas.DrawString("Attachments:", font1, PdfBrushes.CornflowerBlue, new Point(50, 50));

            //将文档作为注释添加到页面
            PdfTrueTypeFont font2 = new PdfTrueTypeFont(new Font("Arial", 12f, System.Drawing.FontStyle.Bold));
            PointF location = new PointF(52, 80);
            //设置注释标签，标签内容为作为附件的文档
            String label = "sample.docx";
            byte[] data = File.ReadAllBytes("sample.docx");
            SizeF size = font2.MeasureString(label);
            //设置注释位置、大小、颜色、标签类型以及显示文本等
            RectangleF bounds = new RectangleF(location, size);
            page.Canvas.DrawString(label, font2, PdfBrushes.MediumPurple, bounds);
            bounds = new RectangleF(bounds.Right + 3, bounds.Top, font2.Height / 2, font2.Height);
            PdfAttachmentAnnotation annotation1 = new PdfAttachmentAnnotation(bounds, "sample.docx", data);
            annotation1.Color = Color.Purple;
            annotation1.Flags = PdfAnnotationFlags.NoZoom;
            annotation1.Icon = PdfAttachmentIcon.Graph;
            annotation1.Text = "sample.docx";
            (page as PdfNewPage).Annotations.Add(annotation1);

            //保存并打开文档
            doc.SaveToFile("Attachment2.pdf");
            System.Diagnostics.Process.Start("Attachment2.pdf");
        }
    }
}

测试结果：

VB.NET

Imports Spire.Pdf
Imports Spire.Pdf.Annotations
Imports Spire.Pdf.Graphics
Imports System
Imports System.Drawing
Imports System.IO

Namespace AddAttachment2

    Class Program

        Private Shared Sub Main(ByVal args As String())
            Dim doc As PdfDocument = New PdfDocument("sample.pdf")
            Dim page As PdfPageBase = doc.Pages.Add()
            Dim font1 As PdfTrueTypeFont = New PdfTrueTypeFont(New Font("Arial", 16F, System.Drawing.FontStyle.Bold))
            page.Canvas.DrawString("Attachments:", font1, PdfBrushes.CornflowerBlue, New Point(50, 50))
            Dim font2 As PdfTrueTypeFont = New PdfTrueTypeFont(New Font("Arial", 12F, System.Drawing.FontStyle.Bold))
            Dim location As PointF = New PointF(52, 80)
            Dim label As String = "sample.docx"
            Dim data As Byte() = File.ReadAllBytes("sample.docx")
            Dim size As SizeF = font2.MeasureString(label)
            Dim bounds As RectangleF = New RectangleF(location, size)
            page.Canvas.DrawString(label, font2, PdfBrushes.MediumPurple, bounds)
            bounds = New RectangleF(bounds.Right + 3, bounds.Top, font2.Height / 2, font2.Height)
            Dim annotation1 As PdfAttachmentAnnotation = New PdfAttachmentAnnotation(bounds, "sample.docx", data)
            annotation1.Color = Color.Purple
            annotation1.Flags = PdfAnnotationFlags.NoZoom
            annotation1.Icon = PdfAttachmentIcon.Graph
            annotation1.Text = "sample.docx"
            (TryCast(page, PdfNewPage)).Annotations.Add(annotation1)
            doc.SaveToFile("Attachment2.pdf")
            System.Diagnostics.Process.Start("Attachment2.pdf")
        End Sub
    End Class
End Namespace

2.获取PDF附件

2.1 获取文件附件

Csharp

using Spire.Pdf;
using Spire.Pdf.Attachments;
using System;
using System.IO;

namespace GetAttachment_PDF
{
    class Program
    {
        static void Main(string[] args)
        {
            //创建PDF文档，加载测试文件
            PdfDocument pdf = new PdfDocument();
            pdf.LoadFromFile("Attachment1.pdf");
            //获取文档中的第一个文件附件
            PdfAttachment attachment = pdf.Attachments[0];

            //获取该附件的信息
            Console.WriteLine("Name: {0}", attachment.FileName);
            Console.WriteLine("MimeType: {0}", attachment.MimeType);
            Console.WriteLine("Description: {0}", attachment.Description);
            Console.WriteLine("Creation Date: {0}", attachment.CreationDate);
            Console.WriteLine("Modification Date: {0}", attachment.ModificationDate);

            //将附件的数据写入到新文档
            File.WriteAllBytes(attachment.FileName, attachment.Data);
            Console.ReadKey();
        }
    }
}

测试结果：

VB.NET

Imports Spire.Pdf
Imports Spire.Pdf.Attachments
Imports System
Imports System.IO

Namespace GetAttachment_PDF

    Class Program

        Private Shared Sub Main(ByVal args As String())
            Dim pdf As PdfDocument = New PdfDocument()
            pdf.LoadFromFile("Attachment1.pdf")
            Dim attachment As PdfAttachment = pdf.Attachments(0)
            Console.WriteLine("Name: {0}", attachment.FileName)
            Console.WriteLine("MimeType: {0}", attachment.MimeType)
            Console.WriteLine("Description: {0}", attachment.Description)
            Console.WriteLine("Creation Date: {0}", attachment.CreationDate)
            Console.WriteLine("Modification Date: {0}", attachment.ModificationDate)
            File.WriteAllBytes(attachment.FileName, attachment.Data)
            Console.ReadKey()
        End Sub
    End Class
End Namespace

2.2 获取注释附件

Csharp

using Spire.Pdf;
using Spire.Pdf.Annotations;
using System.Collections.Generic;
using System.IO;

namespace GetAttachment2
{
    class Program
    {
        static void Main(string[] args)
        {
            //加载PDF文档
            PdfDocument pdf = new PdfDocument();
            pdf.LoadFromFile("Attachment2.pdf");

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

        }
    }
}

测试结果：

VB.NET

Imports Spire.Pdf
Imports Spire.Pdf.Annotations
Imports System.Collections.Generic
Imports System.IO

Namespace GetAttachment2

    Class Program

        Private Shared Sub Main(ByVal args As String())
            Dim pdf As PdfDocument = New PdfDocument()
            pdf.LoadFromFile("Attachment2.pdf")
            Dim attaches As List(Of PdfAttachmentAnnotationWidget) = New List(Of PdfAttachmentAnnotationWidget)()
            For Each page As PdfPageBase In pdf.Pages
                For Each annotation As PdfAnnotation In page.AnnotationsWidget
                    attaches.Add(TryCast(annotation, PdfAttachmentAnnotationWidget))
                Next
            Next

            For i As Integer = 0 To attaches.Count - 1
                File.WriteAllBytes(attaches(i).FileName, attaches(i).Data)
            Next
        End Sub
    End Class
End Namespace

3.删除PDF附件

3.1 删除文件附件

Csharp

using Spire.Pdf;

namespace DeleteAttachment_PDF
{
    class Program
    {
        static void Main(string[] args)
        {
            //加载PDF文档
            PdfDocument pdf = new PdfDocument();
            pdf.LoadFromFile("Attachment1.pdf");

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

            //保存并打开文档
            pdf.SaveToFile("Remove.pdf");
            System.Diagnostics.Process.Start("Remove.pdf");

        }
    }
}

VB.NET

Imports Spire.Pdf

Namespace DeleteAttachment_PDF

    Class Program

        Private Shared Sub Main(ByVal args As String())
            Dim pdf As PdfDocument = New PdfDocument()
            pdf.LoadFromFile("Attachment1.pdf")
            For i As Integer = 0 To pdf.Attachments.Count - 1
                pdf.Attachments.RemoveAt(i)
            Next

            pdf.SaveToFile("Remove.pdf")
            System.Diagnostics.Process.Start("Remove.pdf")
        End Sub
    End Class
End Namespace

3.2 删除注释附件

Csharp

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

namespace DeleteAttachment2
{
    class Program
    {
        static void Main(string[] args)
        {
            //加载PDF文档
            PdfDocument pdf = new PdfDocument();
            pdf.LoadFromFile("Attachment2.pdf");

            //删除文档的所有注释附件
            foreach (PdfPageBase page in pdf.Pages)
            {
                for (int i = 0; i < page.AnnotationsWidget.Count; i++)
                {
                    PdfAnnotation annotation = page.AnnotationsWidget[i] as PdfAttachmentAnnotationWidget;
                    page.AnnotationsWidget.Remove(annotation);
                }
            }

            //保存并打开文档
            pdf.SaveToFile("Result.pdf");
            System.Diagnostics.Process.Start("Result.pdf");
        }
    }
}

VB.NET

Imports Spire.Pdf
Imports Spire.Pdf.Annotations

Namespace DeleteAttachment2

    Class Program

        Private Shared Sub Main(ByVal args As String())
            Dim pdf As PdfDocument = New PdfDocument()
            pdf.LoadFromFile("Attachment2.pdf")
            For Each page As PdfPageBase In pdf.Pages
                For i As Integer = 0 To page.AnnotationsWidget.Count - 1
                    Dim annotation As PdfAnnotation = TryCast(page.AnnotationsWidget(i), PdfAttachmentAnnotationWidget)
                    page.AnnotationsWidget.Remove(annotation)
                Next
            Next

            pdf.SaveToFile("Result.pdf")
            System.Diagnostics.Process.Start("Result.pdf")
        End Sub
    End Class
End Namespace

调试程序后，生成的文档就没有附件了。

以上全部内容为本次关于“C#/VB.NT操作PDF附件”的方法讲述。代码供参考，希望能给各位提供一定解决问题的思路。

( 如需转载本文，请注明出处。)

感谢阅读！

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