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IObjectClassExtension Interface (ArcObjects .NET 10.5 SDK)
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ArcObjects Library Reference (GeoDatabase)  

IObjectClassExtension Interface

Indicator interface for object class extensions.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

CoClasses that implement IObjectClassExtension

CoClasses and Classes Description
AnnotationFeatureClassExtension (esriCarto) An Esri annotation feature class extension.
DimensionClassExtension (esriCarto) A class extension which contains all the style properties for a dimension feature class.
GeocodedFeatureClassExtension (esriLocation) A class extension for automatically maintaining geocoded feature classes.