Document properties

Documents have two types of properties:

• Core properties cover standard fields such as description, subject, title, and creator. The set of core properties is fixed. You cannot create new core properties.
• Custom properties allow third party applications to store data with the document. Each custom property is a name-value pair.

So that custom property names do not clash when different applications choose a custom property name, the name should be prefixed with the application or add-in name, as in the following example:

public static void Example(Document doc) {
	CustomProperty.Create(doc, "BananaWorks.ApplicationVersion", 14);

	CustomProperty property;
	if (doc.CustomProperties.TryGetValue("BananaWorks.ApplicationVersion", out property))
		Debug.Assert((double) property.Value == 14);
}

Note that a document can contain more than one part, so if you want to store data for a part, this is best done by storing a custom attribute on the part master (see next topic).