How to change the size of Form Fields in ASP.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 change the size of form fields in Word document using C#.

The size of a checkbox field can be set, but the height of a text form field and dropdown form field cannot be fixed. The text and dropdown form field automatically adjusts based on the text entered. However, changing the font size will make the field expand to fit the content.

Steps to change the size of form fields in 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.DLS;
using Syncfusion.DocIO; 

4. Use the following code example to change the size of form fields in Word document.
   C#

// Open the template Word document.
using (FileStream fileStream = new FileStream(Path.GetFullPath(@"Data/Template.docx"), FileMode.Open, FileAccess.ReadWrite))
{
   using (WordDocument document = new WordDocument(fileStream, FormatType.Docx))
   {
       // Update checkbox form fields
       List<Entity> checkBoxes = document.FindAllItemsByProperty(EntityType.CheckBox, null, null);
       foreach (Entity entity in checkBoxes)
       {
           WCheckBox checkBox = (WCheckBox)entity;
           checkBox.SizeType = CheckBoxSizeType.Exactly;
           checkBox.CheckBoxSize = 20;
       }

       // Update dropdown form fields
       List<Entity> dropDowns = document.FindAllItemsByProperty(EntityType.DropDownFormField, null, null);
       foreach (Entity entity in dropDowns)
       {
           SetFontSizeForFormField((WDropDownFormField)entity);
       }

       // Update text form fields
       List<Entity> textFormFields = document.FindAllItemsByProperty(EntityType.TextFormField, null, null);
       foreach (Entity entity in textFormFields)
       {
           SetFontSizeForFormField((WTextFormField)entity);
       }
       // Save the modified document
       using (FileStream outputStream = new FileStream(Path.GetFullPath(@"Output/Result.docx"), FileMode.Create, FileAccess.ReadWrite))
       {
           document.Save(outputStream, FormatType.Docx);
       }
   }
}

4. Use the following code example to set the font size for text ranges within a form field.
   C#

/// <summary>
/// Sets the font size for text ranges within a form field until the Field End marker is reached.
/// </summary>
static void SetFontSizeForFormField(Entity formField)
{
   Entity currentEntity = formField;
   while (currentEntity.NextSibling != null)
   {
       if (currentEntity is WTextRange textRange)
       {
           textRange.CharacterFormat.FontSize = 20;
       }
       else if (currentEntity is WFieldMark fieldMark && fieldMark.Type == FieldMarkType.FieldEnd)
       {
           break;
       }
       currentEntity = (Entity)currentEntity.NextSibling;
   }
} 

You can download a complete working sample to change the size of form fields in Word document 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 change the size of Form Fields in ASP.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!