MergeFieldImageDimension class

Represents an image dimension (i.e. the width or the height) used across a mail merge process.

public class MergeFieldImageDimension


Name Description
MergeFieldImageDimension(double) Creates an image dimension instance with the given value in points.
MergeFieldImageDimension(double, MergeFieldImageDimensionUnit) Creates an image dimension instance with the given value and the given unit.


Name Description
Unit { get; set; } The unit.
Value { get; set; } The value.


To indicate that the image should be inserted with its original dimension during a mail merge, you should assign a negative value to the Value property.


Shows how to set the dimensions of images as MERGEFIELDS accepts them during a mail merge.

    Document doc = new Document();

    // Insert a MERGEFIELD that will accept images from a source during a mail merge. Use the field code to reference
    // a column in the data source containing local system filenames of images we wish to use in the mail merge.
    DocumentBuilder builder = new DocumentBuilder(doc);
    FieldMergeField field = (FieldMergeField)builder.InsertField("MERGEFIELD Image:ImageColumn");

    // The data source should have such a column named "ImageColumn".
    Assert.AreEqual("Image:ImageColumn", field.FieldName);

    // Create a suitable data source.
    DataTable dataTable = new DataTable("Images");
    dataTable.Columns.Add(new DataColumn("ImageColumn"));
    dataTable.Rows.Add(ImageDir + "Logo.jpg");
    dataTable.Rows.Add(ImageDir + "Transparent background logo.png");
    dataTable.Rows.Add(ImageDir + "Enhanced Windows MetaFile.emf");

    // Configure a callback to modify the sizes of images at merge time, then execute the mail merge.
    doc.MailMerge.FieldMergingCallback = new MergedImageResizer(200, 200, MergeFieldImageDimensionUnit.Point);

    doc.Save(ArtifactsDir + "Field.MERGEFIELD.ImageDimension.docx");

/// <summary>
/// Sets the size of all mail merged images to one defined width and height.
/// </summary>
private class MergedImageResizer : IFieldMergingCallback
    public MergedImageResizer(double imageWidth, double imageHeight, MergeFieldImageDimensionUnit unit)
        mImageWidth = imageWidth;
        mImageHeight = imageHeight;
        mUnit = unit;

    public void FieldMerging(FieldMergingArgs e)
        throw new NotImplementedException();

    public void ImageFieldMerging(ImageFieldMergingArgs args)
        args.ImageFileName = args.FieldValue.ToString();
        args.ImageWidth = new MergeFieldImageDimension(mImageWidth, mUnit);
        args.ImageHeight = new MergeFieldImageDimension(mImageHeight, mUnit);

        Assert.AreEqual(mImageWidth, args.ImageWidth.Value);
        Assert.AreEqual(mUnit, args.ImageWidth.Unit);
        Assert.AreEqual(mImageHeight, args.ImageHeight.Value);
        Assert.AreEqual(mUnit, args.ImageHeight.Unit);

    private readonly double mImageWidth;
    private readonly double mImageHeight;
    private readonly MergeFieldImageDimensionUnit mUnit;

See Also