How to add line numbers restarting on each page in HTML to PDF Conversion using DocIO?

Syncfusion® Essential® DocIO is a .NET Word library used to create, read, edit, and convert Word documents programmatically without Microsoft Word or interop dependencies. Using this library, you can add line numbers restarting on each page in HTML to PDF Conversion using C#.

To achieve this, placeholder text was used at the beginning of the second page in the HTML file. The content was divided into two sections based on the placeholder, and line numbers were added for each, starting from the initial value.

Steps to add line numbers restarting on each page in HTML to PDF Conversion:

1. Create a new .NET Core console application project.
   
   
2. Install the Syncfusion.DocIORenderer.NET.Core NuGet package as a reference to your project from NuGet.org.
   
   

3. Include the following namespaces in Program.cs file
   C#

using Syncfusion.DocIO.DLS;
using Syncfusion.DocIO;
using Syncfusion.DocIORenderer;
using Syncfusion.Pdf; 

4. Use the following code example to add line numbers restarting on each page in HTML to PDF Conversion.
   C#

// Open the HTML file as a stream.
using (FileStream fileStreamPath = new FileStream(Path.GetFullPath("Sample.html"), FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
   // Load the file stream into a Word document in HTML format.
   using (WordDocument document = new WordDocument(fileStreamPath, FormatType.Html))
   {
       // Instantiate DocIORenderer to handle Word to PDF conversion.
       DocIORenderer render = new DocIORenderer();
       // Split the HTML content into sections and add line numbers where necessary.
       SplitSectionAndSetLineNumber(document);
       // Convert the modified Word document into a PDF document.
       PdfDocument pdfDocument = render.ConvertToPDF(document);
       // Create a file stream for saving the output PDF file.
       using (FileStream outputFileStream = new FileStream(Path.GetFullPath("Output.pdf"), FileMode.Create, FileAccess.ReadWrite))
       {
           // Save the generated PDF document to the output file stream.
           pdfDocument.Save(outputFileStream);
       }
   }
}

5. Use the following method to splits the document content into sections at a placeholder and enables line numbering.
   C#

void SplitSectionAndSetLineNumber(WordDocument document)
{
   // Get the first and only section of the document.
   WSection section = document.Sections[0];
   // Find the text range for the placeholder text ("Page2").
   WTextRange placeHolder = document.Find("Page2", true, true).GetAsOneRange();
   // Get the index of the paragraph containing the placeholder.
   int index = section.Body.ChildEntities.IndexOf(placeHolder.OwnerParagraph);
   // Clone the entire section to create a new section starting from the placeholder.
   WSection clonedSection = section.Clone();
   // Remove all content before the placeholder paragraph in the cloned section.
   for (int i = index - 1; i >= 0; i--)
       clonedSection.Body.ChildEntities.RemoveAt(i);
   // Add the modified cloned section to the document.
   document.ChildEntities.Add(clonedSection);
   // Remove all content from the placeholder paragraph to the end in the original section.
   for (int i = index; i < section.Body.ChildEntities.Count;)
       section.Body.ChildEntities.RemoveAt(i);
   // Enable line numbering to restart at each section.
   section.PageSetup.LineNumberingMode = LineNumberingMode.RestartSection;
   clonedSection.PageSetup.LineNumberingMode = LineNumberingMode.RestartSection;
} 

You can download a complete working sample to add line numbers restarting on each page in HTML to PDF Conversion from the GitHub.

Take a moment to peruse the documentation where you can find basic Word document processing options along with the features like mail merge, merge, split, and compare Word documents, find and replace text in the Word document, protect the Word documents, and most importantly, the PDF and Image conversions with code examples.

Conclusion

I hope you enjoyed learning about how to add line numbers restarting on each page in HTML to PDF Conversion.

You can refer to our ASP.NET Core DocIO feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications. You can also explore our ASP.NET Core DocIO example to understand how to create and manipulate data.

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