How to Change Font for All Text in .NET Core Word Document?

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 change font for all text in Word document using C#.

Text within a paragraph is represented by one or more instances of the WTextRange. Each WTextRange instance can have its own font (text) formatting.You can find WTextRange by using FindAllItemsByProperty API, find all the WTextRange in the Word document.

Steps to change font for all text in Word document in C#

1. Create a new C# .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 namespace in the Program.cs file.
   C#

using Syncfusion.DocIO;
using Syncfusion.DocIO.DLS; 

4. Use the following code to change font for all text in Word document.
   C#

// Create an input file stream to open the document.
using (FileStream inputStream = new FileStream(Path.GetFullPath(@"Data/Input.docx"), FileMode.Open, FileAccess.Read))        
{        
   // Create a new Word document instance from the input stream.       
   using (WordDocument document = new WordDocument(inputStream, FormatType.Docx))        
   {        
       // Change the font of the document text to "Times New Roman".        
       ChangeFontName(document, "Times New Roman");        

       // Create an output file stream to save the modified document.       
       using (FileStream outputStream = new FileStream(Path.GetFullPath(@"Output/Result.docx"), FileMode.OpenOrCreate, FileAccess.ReadWrite))        
       {        
           // Save the modified document to the output stream in DOCX format.        
           document.Save(outputStream, FormatType.Docx);        
       }        
   }        
}        

5. Use the following method to change font name.
   C#

static void ChangeFontName(WordDocument document, string fontName)
{
    // Find all paragraphs by EntityType in the Word document.
    List<Entity> paragraphs = document.FindAllItemsByProperty(EntityType.Paragraph, null, null);

    // Change the font name for all paragraph marks (non-printing characters).
    for (int i = 0; i < paragraphs.Count; i++)
    {
        WParagraph paragraph = paragraphs[i] as WParagraph;
        paragraph.BreakCharacterFormat.FontName = fontName;
    }

    // Find all text ranges by EntityType in the Word document.
    List<Entity> textRanges = document.FindAllItemsByProperty(EntityType.TextRange, null, null);

    // Change the font name for all text content in the document.
    for (int i = 0; i < textRanges.Count; i++)
    {
        WTextRange textRange = textRanges[i] as WTextRange;
        textRange.CharacterFormat.FontName = fontName;
    }
} 

You can download a complete working sample to change font for all text in Word document from GitHub

The screenshot below illustrates how the template is transformed into the output.

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 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 Change font for all text in .NET Core Word document.

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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