How to Apply List Numbering When Merging .NET Core Word Documents?

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 apply continuous list numbering when merging two documents with different list styles using C#.

Steps to apply continuous list numbering when merging two documents with different list styles:

1. Create a new .NET Core console application project.
2. Install the Syncfusion.DocIO.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; 

4. Use the following code example to apply continuous list numbering when merging two documents with different list styles.
   C#

using (FileStream destinationStream = new FileStream(Path.GetFullPath("Data/DestinationDocument.docx"), FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
   // Open the destination Word document.
   using (WordDocument destinationDocument = new WordDocument(destinationStream, FormatType.Docx))
   {
       using (FileStream sourceStream = new FileStream(Path.GetFullPath("Data/SourceDocument.docx"), FileMode.Open, FileAccess.ReadWrite))
       {
           // Open the source Word document.
           using (WordDocument sourceDocument = new WordDocument(sourceStream, FormatType.Docx))
           {
               // Set the break code as no break to prevent page breaks.
               sourceDocument.Sections[0].BreakCode = SectionBreakCode.NoBreak;
               // Initialize a variable to hold the list style from the destination document.
               ListStyle listStyle = null;
               // Iterate through the paragraphs in the last section of the destination document.
               int paragraphCount = destinationDocument.LastSection.Paragraphs.Count;
               for (int i = paragraphCount - 1; i >= 0; i--)
               {
                   WParagraph paragraph = destinationDocument.LastSection.Paragraphs[i];
                   // Get the current list style.
                   if (paragraph.ListFormat.CurrentListStyle != null)
                       listStyle = paragraph.ListFormat.CurrentListStyle;
                   else
                   {
                       // Check the paragraph style for a list style and store it.
                       WParagraphStyle style = destinationDocument.Styles.FindByName(paragraph.StyleName) as WParagraphStyle;
                       if (style != null)
                           listStyle = style.ListFormat.CurrentListStyle;
                   }
                   // Break the loop if a list style is found.
                   if (listStyle != null)
                       break;
               }
               // Import the content of the source document at the end of the destination document.
               destinationDocument.ImportContent(sourceDocument, ImportOptions.ListContinueNumbering);
               if (listStyle != null)
               {
                   // Apply liststyle to the paragraphs in the destination document to maintain continuous numbering.
                   foreach (WParagraph paragraph in destinationDocument.LastSection.Paragraphs)
                   {
                       if (paragraph.ListFormat.CurrentListStyle != null)
                           paragraph.ListFormat.ApplyStyle(listStyle.Name);
                   }
               }
               // Save the merged document.
               using (FileStream outputStream = new FileStream(Path.GetFullPath("Output/Result.docx"), FileMode.Create, FileAccess.ReadWrite))
               {
                   destinationDocument.Save(outputStream, FormatType.Docx);
               }
           }
       }
   }
}

You can download a complete working sample to apply continuous list numbering when merging two documents with different list styles from the GitHub.

By executing the program, you will get the Word document as follows.

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 apply list numbering when merging .NET Core Word documents.

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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