MailMergeUseNonMergeFields Property

When true, specifies that in addition to MERGEFIELD fields, mail merge is performed into some other types of fields and also into "{{fieldName}}" tags.

Namespace:  Aspose.Words.MailMerging
Assembly:  Aspose.Words (in Aspose.Words.dll) Version: 21.5.0


public bool UseNonMergeFields { get; set; }

Property Value

Type: Boolean


Normally, mail merge is only performed into MERGEFIELD fields, but several customers had their reporting built using other fields and had many documents created this way. To simplify migration (and because this approach was independently used by several customers) the ability to mail merge into other fields was introduced.

When UseNonMergeFields is set to true, Aspose.Words will perform mail merge into the following fields:



IF 0 = 0 "{FieldName}" ""

Also, when UserNonMergeFields is set to true, Aspose.Words will perform mail merge into text tags "{{fieldName}}". These are not fields, but just text tags.


Shows how to preserve the appearance of alternative mail merge tags that go unused during a mail merge.
public void PreserveUnusedTags(bool preserveUnusedTags)
    Document doc = CreateSourceDocWithAlternativeMergeFields();
    DataTable dataTable = CreateSourceTablePreserveUnusedTags();

    // By default, a mail merge places data from each row of a table into MERGEFIELDs, which name columns in that table. 
    // Our document has no such fields, but it does have plaintext tags enclosed by curly braces.
    // If we set the "PreserveUnusedTags" flag to "true", we could treat these tags as MERGEFIELDs
    // to allow our mail merge to insert data from the data source at those tags.
    // If we set the "PreserveUnusedTags" flag to "false",
    // the mail merge will convert these tags to MERGEFIELDs and leave them unfilled.
    doc.MailMerge.PreserveUnusedTags = preserveUnusedTags;

    doc.Save(ArtifactsDir + "MailMerge.PreserveUnusedTags.docx");

    // Our document has a tag for a column named "Column2", which does not exist in the table.
    // If we set the "PreserveUnusedTags" flag to "false", then the mail merge will convert this tag into a MERGEFIELD.
    Assert.AreEqual(doc.GetText().Contains("{{ Column2 }}"), preserveUnusedTags);

    if (preserveUnusedTags)
        Assert.AreEqual(0, doc.Range.Fields.Count(f => f.Type == FieldType.FieldMergeField));
        Assert.AreEqual(1, doc.Range.Fields.Count(f => f.Type == FieldType.FieldMergeField));

/// <summary>
/// Create a document and add two plaintext tags that may act as MERGEFIELDs during a mail merge.
/// </summary>
private static Document CreateSourceDocWithAlternativeMergeFields()
    Document doc = new Document();
    DocumentBuilder builder = new DocumentBuilder(doc);

    builder.Writeln("{{ Column1 }}");
    builder.Writeln("{{ Column2 }}");

    // Our tags will register as destinations for mail merge data only if we set this to true.
    doc.MailMerge.UseNonMergeFields = true;

    return doc;

/// <summary>
/// Create a simple data table with one column.
/// </summary>
private static DataTable CreateSourceTablePreserveUnusedTags()
    DataTable dataTable = new DataTable("MyTable");
    dataTable.Rows.Add(new object[] { "Value1" });

    return dataTable;

ExpandedSee Also