How to Expand and Collapse Headings Content in .NET Core Word?

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 expand and collapse content based on headings in a Word document using C#.

• In the Microsoft Word viewer, applying a heading style to a paragraph allows the content under that heading to be expanded or collapsed until the next heading style.
• Syncfusion® DocIO is a non-UI library that allows you to apply heading styles to paragraphs but does not replicate Word’s interactive UI behavior.
• When the output document is opened in Microsoft Word, the content under the headings will expand and collapse according to the default behavior of the Word viewer.

Steps to expand and collapse content based on headings in a Word document:

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;
using Syncfusion.DocIO.DLS; 

4. Use the following code example to expand and collapse content based on headings in a Word document.
   C#

// Create a new Word document and add a section to it.
WordDocument document = new WordDocument();
WSection section = document.AddSection() as WSection;

// Add a paragraph and append text to it.
WParagraph paragraph = section.AddParagraph() as WParagraph;
paragraph.AppendText("The Giant Panda");
// Apply heading level 1.
paragraph.ApplyStyle(BuiltinStyle.Heading1);
// Add a paragraph and append text to it.
paragraph = section.AddParagraph() as WParagraph;
paragraph.AppendText("The giant panda, which only lives in China outside of captivity, has captured the hearts of people of all ages across the globe.");

// Add a paragraph and append text to it.
paragraph = section.AddParagraph() as WParagraph;
paragraph.AppendText("Small panda or Large Raccoon?");
// Apply heading level 2.
paragraph.ApplyStyle(BuiltinStyle.Heading2);
// Add a paragraph and append text to it.
paragraph = section.AddParagraph() as WParagraph;
paragraph.AppendText("Giant pandas are generally referred to as bears and are typically called panda bears rather than giant pandas.it has several characteristics in common with the red panda.");

// Add a paragraph and append text to it.
paragraph = section.AddParagraph() as WParagraph;
paragraph.AppendText("Adventure Works Cycles");
// Apply heading level 1.
paragraph.ApplyStyle(BuiltinStyle.Heading1);
// Add a paragraph and append text to it.
paragraph = section.AddParagraph() as WParagraph;
paragraph.AppendText("Adventure Works Cycles, the fictitious company on which the AdventureWorks sample databases are based, is a large, multinational manufacturing company.");

// Add a paragraph and append text to it.
paragraph = section.AddParagraph() as WParagraph;
paragraph.AppendText("Product Overview");
// Apply heading level 2.
paragraph.ApplyStyle(BuiltinStyle.Heading2);
// Add a paragraph and append text to it.
paragraph = section.AddParagraph() as WParagraph;
paragraph.AppendText("While its base operation is located in Bothell, Washington with 290 employees, several regional sales teams are located throughout their market base.");

// Save the document.
using (FileStream outputStream = new FileStream(Path.GetFullPath(@"Output/Result.docx"), FileMode.OpenOrCreate, FileAccess.ReadWrite))
{
   document.Save(outputStream, FormatType.Docx);
}

You can download a complete working sample to expand and collapse content based on headings in a Word document 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 expand and collapse headings content in .NET Core Word.
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.

For current customers, you can check out our components from the License and Downloads page. If you are new to Syncfusion®, you can try our 30-day free trial to check out our other controls.

If you have any queries or require clarifications, please let us know in the comments section below. You can also contact us through our support forums, Direct-Trac, or feedback portal. We are always happy to assist you!