C#/VB.NET如何添加、获取、删除PDF附件-创新互联

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：
C#/VB.NET 如何添加、获取、删除PDF附件

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：
C#/VB.NET 如何添加、获取、删除PDF附件

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：
C#/VB.NET 如何添加、获取、删除PDF附件

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：
C#/VB.NET 如何添加、获取、删除PDF附件

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！

《本文完》

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C#/VB.NET如何添加、获取、删除PDF附件-创新互联

概述

要点索引

工具使用

示例操作

1.添加PDF附件

1.1 以普通文档形式添加附件

Csharp

VB.NET

1.2 以文档注释形式添加附件

Csharp

VB.NET

2.获取PDF附件

2.1 获取文件附件

Csharp

VB.NET

2.2 获取注释附件

Csharp

VB.NET

3.删除PDF附件

3.1 删除文件附件

Csharp

VB.NET

3.2 删除注释附件

Csharp

VB.NET

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