How to replace SVG and other images in ASP.NET 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 replace SVG and other images in a Word document using C#.

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 replace SVG and other images in a Word document.
   C#

// Open the input Word document.
using (FileStream inputStream = new FileStream(@"Data/Template.docx", FileMode.Open, FileAccess.ReadWrite))
{
   WordDocument document = new WordDocument(inputStream, FormatType.Docx);
   // Find and process all images in the document.
   foreach (Entity entity in document.FindAllItemsByProperty(EntityType.Picture, null, null))
   {
       WPicture picture = (WPicture)entity;
       float width = picture.Width, height = picture.Height;
       // Check if the image is not an SVG.
       if (picture.SvgData == null)
       {
           // Replace the existing image with a new one.
           using (FileStream imageStream = new FileStream(@"Data/Picture.png", FileMode.Open))
           {
               picture.LoadImage(imageStream);
           }
           // Preserve the original dimensions.
           picture.LockAspectRatio = false;
           picture.Width = width;
           picture.Height = height;
           picture.LockAspectRatio = true;
       }
       else
       {
           // Handle SVG conversion to raster image.
           WParagraph ownerParagraph = picture.OwnerParagraph;
           int index = ownerParagraph.ChildEntities.IndexOf(picture);
           // Remove the existing SVG image.
           ownerParagraph.ChildEntities.Remove(picture);
           // Create a new image and insert it in the same place.
           WPicture newPicture = new WPicture(document);
           using (FileStream imageStream = new FileStream(@"Data/Picture.png", FileMode.Open))
           {
               newPicture.LoadImage(imageStream);
           }
           // Set the same dimensions as the original SVG.
           newPicture.Width = width;
           newPicture.Height = height;
           ownerParagraph.ChildEntities.Insert(index, newPicture);
       }
   }
   // Save the modified document.
   using (FileStream outputStream = new FileStream(@"Output/Result.docx", FileMode.Create, FileAccess.Write))
   {
       document.Save(outputStream, FormatType.Docx);
   }
}

You can download a complete working sample to replace SVG and other images in a 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 replace SVG and other images in ASP.NETWord 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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