CustomXmlProperty class

Represents a single custom XML attribute or a smart tag property.

To learn more, visit the Structured Document Tags or Content Control documentation article.

public class CustomXmlProperty


CustomXmlProperty(string, string, string)Initializes a new instance of this class.


Name { get; }Specifies the name of the custom XML attribute or smart tag property.
Uri { get; set; }Gets or sets the namespace URI of the custom XML attribute or smart tag property.
Value { get; set; }Gets or sets the value of the custom XML attribute or smart tag property.


Used as an item of a CustomXmlPropertyCollection collection.


Shows how to create smart tags.

public void Create()
    Document doc = new Document();

    // A smart tag appears in a document with Microsoft Word recognizes a part of its text as some form of data,
    // such as a name, date, or address, and converts it to a hyperlink that displays a purple dotted underline.
    SmartTag smartTag = new SmartTag(doc);

    // Smart tags are composite nodes that contain their recognized text in its entirety.
    // Add contents to this smart tag manually.
    smartTag.AppendChild(new Run(doc, "May 29, 2019"));

    // Microsoft Word may recognize the above contents as being a date.
    // Smart tags use the "Element" property to reflect the type of data they contain.
    smartTag.Element = "date";

    // Some smart tag types process their contents further into custom XML properties.
    smartTag.Properties.Add(new CustomXmlProperty("Day", string.Empty, "29"));
    smartTag.Properties.Add(new CustomXmlProperty("Month", string.Empty, "5"));
    smartTag.Properties.Add(new CustomXmlProperty("Year", string.Empty, "2019"));

    // Set the smart tag's URI to the default value.
    smartTag.Uri = "urn:schemas-microsoft-com:office:smarttags";

    doc.FirstSection.Body.FirstParagraph.AppendChild(new Run(doc, " is a date. "));

    // Create another smart tag for a stock ticker.
    smartTag = new SmartTag(doc);
    smartTag.Element = "stockticker";
    smartTag.Uri = "urn:schemas-microsoft-com:office:smarttags";

    smartTag.AppendChild(new Run(doc, "MSFT"));

    doc.FirstSection.Body.FirstParagraph.AppendChild(new Run(doc, " is a stock ticker."));

    // Print all the smart tags in our document using a document visitor.
    doc.Accept(new SmartTagPrinter());

    // Older versions of Microsoft Word support smart tags.
    doc.Save(ArtifactsDir + "SmartTag.Create.doc");

    // Use the "RemoveSmartTags" method to remove all smart tags from a document.
    Assert.AreEqual(2, doc.GetChildNodes(NodeType.SmartTag, true).Count);


    Assert.AreEqual(0, doc.GetChildNodes(NodeType.SmartTag, true).Count);

/// <summary>
/// Prints visited smart tags and their contents.
/// </summary>
private class SmartTagPrinter : DocumentVisitor
    /// <summary>
    /// Called when a SmartTag node is encountered in the document.
    /// </summary>
    public override VisitorAction VisitSmartTagStart(SmartTag smartTag)
        Console.WriteLine($"Smart tag type: {smartTag.Element}");
        return VisitorAction.Continue;

    /// <summary>
    /// Called when the visiting of a SmartTag node is ended.
    /// </summary>
    public override VisitorAction VisitSmartTagEnd(SmartTag smartTag)
        Console.WriteLine($"\tContents: \"{smartTag.ToString(SaveFormat.Text)}\"");

        if (smartTag.Properties.Count == 0)
            Console.WriteLine("\tContains no properties");
            Console.Write("\tProperties: ");
            string[] properties = new string[smartTag.Properties.Count];
            int index = 0;

            foreach (CustomXmlProperty cxp in smartTag.Properties)
                properties[index++] = $"\"{cxp.Name}\" = \"{cxp.Value}\"";

            Console.WriteLine(string.Join(", ", properties));

        return VisitorAction.Continue;

See Also