How to Set Size Images While Performing Mail Merge in ASP.NET Word?

Syncfusion® Essential® DocIO is a ASP.NET Word library used to create, read, edit, and convert Word documents programmatically without Microsoft Word or interop dependencies. Using this library, you can set the same size for all images while performing a mail merge in a Word document using C#.

To achieve this, use the Height and Width APIs of the WPicture class.

Steps to set the same size for all images while performing a mail merge 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.DLS;
using Syncfusion.DocIO; 

4. Use the following code example to set the same size for all images while performing a mail merge in a Word document.
   C#

// Open the Word template document as a file stream.
using (FileStream fileStream = new FileStream(Path.GetFullPath("Template.docx"), FileMode.Open, FileAccess.ReadWrite))
{
   //Opens the template document.
   using (WordDocument document = new WordDocument(fileStream, FormatType.Docx))
   {
       //Uses the mail merge events handler for image fields.
       document.MailMerge.MergeImageField += new MergeImageFieldEventHandler(MergeField_ProductImage);
       //Specifies the field names and field values.
       string[] fieldNames = new string[] { "Logo" , "Picture1", "Picture2", "Picture3"};
       string[] fieldValues = new string[] { "Logo.png", "Picture1.gif", "Picture2.gif","Picture3.gif" };
       //Executes the mail merge with groups.
       document.MailMerge.Execute(fieldNames, fieldValues);
       //Creates file stream.
       using (FileStream outputStream = new FileStream(Path.GetFullPath("Result.docx"), FileMode.Create, FileAccess.ReadWrite))
       {
           //Saves the Word document to file stream.
           document.Save(outputStream, FormatType.Docx);
       }
   }
}

5. Use the following code example to represents the method that handles MergeImageField event.
   C#

private static void MergeField_ProductImage(object sender, MergeImageFieldEventArgs args)
{
   //Binds image from file system during mail merge.
   if (args.FieldName == "Logo" || args.FieldName == "Picture1" || args.FieldName == "Picture2" || args.FieldName == "Picture3")
   {
       string ProductFileName = args.FieldValue.ToString();
       //Gets the image from file system
       FileStream imageStream = new FileStream(Path.GetFullPath(@"Data/" + ProductFileName), FileMode.Open, FileAccess.Read);
       args.ImageStream = imageStream;
       //Gets the picture, to be merged for image merge field
       WPicture picture = args.Picture;
       //Resizes the picture
       picture.Height = 50;
       picture.Width = 100;
   }
}

You can download a complete working sample to set the same size for all images while performing a mail merge 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 set size images while performing mail merge in ASP.NET 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.

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