Comments in Word are author reviews about specified contents. It can be removed and replaced with other comments for showing different reviews. Spire.Doc for .NET provides several methods with users to remove and replace comments in different situations. The following screenshot is a document with comments without removing and replacing.

Remove

There are three possibilities to remove comments.

• Remove One Comment: Method Document.Comments.RemoveAt enables users to remove one specified comment item. The index number is passed to this method to confirm which comment will be removed.
• Remove All Comments: Method Document.Comments.Clear() enables users to remove all comments in loaded Word document.
• Remove Part of One Comment (Body Paragraph): Firstly, get the specified comment item in document. Secondly, get paragraph collection in comments body. Thirdly, use method ParagraphCollection.RemoveAt method to remove body paragraph. The index number is passed to this method to confirm which paragraph will be removed.

Replace

It means to replace contents of body paragraphs in one specified comments. So at the beginning, the comment item and paragraph item in comment body should be gotten. Method Paragraph.Replace method can be used to replace comments. There are six possibilities this method provides.

• Replace regular expression pattern with replace string (the new comment).
• Replace regular expression pattern with text selection.
• Replace regular expression pattern with text selection taking into consideration of preserving comment formatting.
• Replace given string (original comment contents) with replace string, taking into consideration of case-sensitive and whole word option.
• Replace given string with text selection, taking into consideration of case-sensitive and whole word option.
• Replace give string with text selection, taking into consideration of case-sensitive, whole word options and formatting preservation.

The following example shows how to replace body paragraph of the first comment and remove the whole second comment in the loaded document. Download and install Spire.Doc for .NET and use the following code.

using Spire.Doc;

namespace RemoveandReplace
{
    class Program
    {
        static void Main(string[] args)
        {
            //Load Document
            Document document = new Document();
            document.LoadFromFile(@"E:\work\Documents\WordDocuments\A GOOD MAN IS HARD TO FIND.docx");

            //Replace Contents of The First Comment
            document.Comments[0].Body.Paragraphs[0].Replace("It’s a title with Mistral font style.", "This comment is changed.", false, false);

            //Remove The Second Comment
            document.Comments.RemoveAt(1);

            //Save and Launch
            document.SaveToFile("RemoveandReplace.docx", FileFormat.Docx);
            System.Diagnostics.Process.Start("RemoveandReplace.docx");
        }
    }
}

Imports Spire.Doc

Namespace RemoveandReplace
    Friend Class Program
        Shared Sub Main(ByVal args() As String)
            'Load Document
            Dim document As New Document()
            document.LoadFromFile("E:\work\Documents\WordDocuments\A GOOD MAN IS HARD TO FIND.docx")

            'Replace Contents of The First Comment
            document.Comments(0).Body.Paragraphs(0).Replace("It’s a title with Mistral font style.", "This comment is changed.", False, False)

            'Remove The Second Comment
            document.Comments.RemoveAt(1)

            'Save and Launch
            document.SaveToFile("RemoveandReplace.docx", FileFormat.Docx)
            System.Diagnostics.Process.Start("RemoveandReplace.docx")
        End Sub
    End Class
End Namespace

After running, you can get result below:

Spire.Doc, a professional Word component, enables developers/programmers perform a wide range of processing tasks, such as generate, write, modify and save for their customize .NET, Silverlight and WPF applications.

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Besides text and graphics, PDF files can contain entire files inside them as attachments. This makes the exchange of sets of documents much easier and more reliable. Spire.PDF allows you to attach files in two ways:

• Document Level Attachment: A file attached to a PDF at the document level won't appear on a page, but can only be viewed in the "Attachments" panel of a PDF reader.
• Annotation Attachment: A file will be added to a specific position of a page. Annotation attachments are shown as a paper clip icon on the page; reviewers can double-click the icon to open the file.

This article demonstrates how to add or remove these two types of attachments in a PDF document in C# and VB.NET using Spire.PDF for .NET.

• Add an Attachment to PDF in C# and VB.NET
• Add an Annotation Attachment to PDF in C# and VB.NET
• Remove Attachments from PDF in C# and VB.NET
• Remove Annotation Attachments from PDF in C# and VB.NET

Install Spire.PDF for .NET

To begin with, you need to add the DLL files included in the Spire.PDF for.NET package as references in your .NET project. The DLLs files can be either downloaded from this link or installed via NuGet.

PM> Install-Package Spire.PDF

Add an Attachment to PDF in C# and VB.NET

Adding an attachment to the "Attachments" panel can be easily done by using PdfDocument.Attachments.Add() method. The following are the detailed steps.

• Create a PdfDocument object.
• Load a PDF document using PdfDocument.LoadFromFile() method.
• Create a PdfAttachment object based on an external file.
• Add the attachment to PDF using PdfDocument.Attachments.Add() method.
• Save the document to another PDF file using PdfDocument.SaveToFile() method.

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

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

            //Load a sample PDF file
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Sample.pdf");

            //Create a PdfAttachment object based on an external file
            PdfAttachment attachment = new PdfAttachment("C:\\Users\\Administrator\\Desktop\\Data.xlsx");

            //Add the attachment to PDF
            doc.Attachments.Add(attachment);

            //Save to file
            doc.SaveToFile("Attachment.pdf");
        }
    }
}

Imports Spire.Pdf
Imports Spire.Pdf.Attachments
 
Namespace AttachFilesToPDF
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument =  New PdfDocument() 
 
            'Load a sample PDF file
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Sample.pdf")
 
            'Create a PdfAttachment object based on an external file
            Dim attachment As PdfAttachment =  New PdfAttachment("C:\\Users\\Administrator\\Desktop\\Data.xlsx") 
 
            'Add the attachment to PDF
            doc.Attachments.Add(attachment)
 
            'Save to file
            doc.SaveToFile("Attachment.pdf")
        End Sub
    End Class
End Namespace

Add an Annotation Attachment to PDF in C# and VB.NET

An annotation attachment can be found in the "Attachments" panel as well as on a specific page. Below are the steps to add an annotation attachment to PDF using Spire.PDF for .NET.

• Create a PdfDocument object.
• Load a PDF document using PdfDocument.LoadFromFile() method.
• Get a specific page to add annotation through PdfDocument.Pages[] property.
• Create a PdfAttachmentAnnotation object based on an external file.
• Add the annotation attachment to the page using PdfPageBase.AnnotationsWidget.Add() method.
• Save the document to another PDF file using PdfDocument.SaveToFile() method.

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)
        {
            //Create a PdfDocument object
            PdfDocument doc = new PdfDocument();

            //Load a sample PDF file
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Sample.pdf");

            //Get a specific page
            PdfPageBase page = doc.Pages[0];

            //Draw a label on PDF
            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);

            //Create a PdfAttachmentAnnotation object based on an external file
            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";

            //Add the attachment annotation to PDF
            page.AnnotationsWidget.Add(annotation);

            //Save to file
            doc.SaveToFile("Annotation.pdf");
        }
    }
}

Imports Spire.Pdf
Imports Spire.Pdf.Annotations
Imports Spire.Pdf.Graphics
Imports System
Imports System.Drawing
Imports System.IO
 
Namespace AnnotationAttachment
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument =  New PdfDocument() 
 
            'Load a sample PDF file
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Sample.pdf")
 
            'Get a specific page
            Dim page As PdfPageBase =  doc.Pages(0) 
 
            'Draw a label on PDF
            Dim label As String =  "Here is the report:" 
            Dim font As PdfTrueTypeFont =  New PdfTrueTypeFont(New Font("Arial",13f,FontStyle.Bold),True) 
            Dim x As single =  35 
            Dim y As single =  doc.Pages(0).ActualSize.Height - 220 
            page.Canvas.DrawString(label, font, PdfBrushes.Red, x, y)
 
            'Create a PdfAttachmentAnnotation object based on an external file
            Dim filePath As String =  "C:\\Users\\Administrator\\Desktop\\Report.pptx" 
            Dim data() As Byte =  File.ReadAllBytes(filePath) 
            Dim size As SizeF =  font.MeasureString(label) 
            Dim bounds As RectangleF =  New RectangleF(CType((x + size.Width + 5),(single)y,10,15, single)) 
            Dim annotation As PdfAttachmentAnnotation =  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"
 
            'Add the attachment annotation to PDF
            page.AnnotationsWidget.Add(annotation)
 
            'Save to file
            doc.SaveToFile("Annotation.pdf")
        End Sub
    End Class
End Namespace

Remove Attachments from PDF in C# and VB.NET

The attachments of a PDF document can be accessed by the PdfDocument.Attachments property, and can be removed by using RemoveAt() method or Clear() method of the PdfAttachmentCollection object. The detailed steps are as follows.

• Create a PdfDocument object.
• Load a PDF document using PdfDocument.LoadFromFile() method.
• Get the attachment collection from the document through PdfDocument.Attachments property.
• Remove a specific attachment using PdfAttachmentCollection.RemoveAt() method. To remove all attachments at once, use PdfAttachmentCollection.Clear() method.
• Save the document to another PDF file using PdfDocument.SaveToFile() method.

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

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

            //Load a PDF file
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Attachment.pdf");

            //Get attachment collection
            PdfAttachmentCollection attachments = doc.Attachments;

            //Remove a specific attachment
            attachments.RemoveAt(0);

            //Remove all attachments
            //attachments.Clear();

            //save to file
            doc.SaveToFile("DeleteAttachments.pdf");
        }
    }
}

Imports Spire.Pdf
Imports Spire.Pdf.Attachments
 
Namespace RemoveAttachments
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument =  New PdfDocument() 
 
            'Load a PDF file
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Attachment.pdf")
 
            'Get attachment collection
            Dim attachments As PdfAttachmentCollection =  doc.Attachments 
 
            'Remove a specific attachment
            attachments.RemoveAt(0)
 
            'Remove all attachments
            'attachments.Clear();
 
            'save to file
            doc.SaveToFile("DeleteAttachments.pdf")
        End Sub
    End Class
End Namespace

Remove Annotation Attachments from PDF in C# and VB.NET

Annotation is a page-based element. To get all annotations from a document, we must traverse through the pages and get the annotations from each page. Then determine if a certain annotation is an annotation attachment. Lastly, remove the annotation attachment from the annotation collection using Remove() method.  The following are the detailed steps.

• Create a PdfDocument object.
• Load a PDF document using PdfDocument.LoadFromFile() method.
• Loop through the pages in the document, and get the annotation collection from a specific page through PdfDocument.Pages[].AnnotationsWidget property.
• Determine if an annotation is an instance of PdfAttachmentAnnotationWidget. If yes, remove the annotation attachment using PdfAnnotationCollection.Remove() method.
• Save the document to another PDF file using PdfDocument.SaveToFile() method.

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

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

            //Load a PDF file
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Annotation.pdf");

            //Loop through the pages
            for (int i = 0; i < doc.Pages.Count; i++)
            {
                //Get the annotation collection
                PdfAnnotationCollection annotationCollection = doc.Pages[i].AnnotationsWidget;

                //Loop through the annotations
                for (int j = 0; j < annotationCollection.Count; j++)
                {
                    //Determine if an annotation is an instance of PdfAttachmentAnnotationWidget
                    if (annotationCollection[j] is PdfAttachmentAnnotationWidget)
                    {
                        //Remove the annotation attachment 
                        annotationCollection.Remove((PdfAnnotation)annotationCollection[j]);
                    }
                }
            }

            //Save to file
            doc.SaveToFile("DeleteAnnotationAttachments.pdf");
        }
    }
}

Imports Spire.Pdf
Imports Spire.Pdf.Annotations
 
Namespace RemoveAnnotationAttachments
    Class Program
        Shared  Sub Main(ByVal args() As String)
            'Create a PdfDocument object
            Dim doc As PdfDocument =  New PdfDocument() 
 
            'Load a PDF file
            doc.LoadFromFile("C:\\Users\\Administrator\\Desktop\\Annotation.pdf")
 
            'Loop through the pages
            Dim i As Integer
            For  i = 0 To  doc.Pages.Count- 1  Step  i + 1
                'Get the annotation collection
                Dim annotationCollection As PdfAnnotationCollection =  doc.Pages(i).AnnotationsWidget 
 
                'Loop through the annotations
                Dim j As Integer
                For  j = 0 To  annotationCollection.Count- 1  Step  j + 1
                    'Determine if an annotation is an instance of PdfAttachmentAnnotationWidget
                    If TypeOf annotationCollection(j) Is PdfAttachmentAnnotationWidget Then
                        'Remove the annotation attachment 
                        annotationCollection.Remove(CType(annotationCollection(j), PdfAnnotation))
                    End If
                Next
            Next
 
            'Save to file
            doc.SaveToFile("DeleteAnnotationAttachments.pdf")
        End Sub
    End Class
End Namespace

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