System.ComponentModel.Composition 4.0.0.0 System.EventArgs To be added. Provides data for the event. Constructor 4.0.0.0 To be added. Initializes a new instance of the class with the specified changes. The part definitions that were added to the catalog. The part definitions that were removed from the catalog. The composition transaction to use, or null to disable transactional composition. Property 4.0.0.0 System.Collections.Generic.IEnumerable<System.ComponentModel.Composition.Primitives.ComposablePartDefinition> To be added. To be added. Gets a collection of definitions added to the in this change. Property 4.0.0.0 System.ComponentModel.Composition.Hosting.AtomicComposition To be added. To be added. Gets the composition transaction for this change. Property 4.0.0.0 System.Collections.Generic.IEnumerable<System.ComponentModel.Composition.Primitives.ComposablePartDefinition> To be added. To be added. Gets a collection of definitions removed from the in this change.