A collection is a type of object that contains many instances of similar objects. The following list contains some of the collection objects that are found in the AutoCAD .NET API:
Contains all entities within a specific block definition.
Contains all blocks in the drawing.
Contains all dictionaries in the drawing.
Contains all dimension styles in the drawing.
Contains all open drawings in the current session.
Contains all items in the File Dependency List.
Contains all groups in the drawing.
Contains all hyperlinks for a given entity.
Contains all layers in the drawing.
Contains all layouts in the drawing.
Contains all linetypes in the drawing.
Contains all menus currently displayed in AutoCAD.
Contains all customization groups currently loaded in AutoCAD. A customization group represents a loaded CUIx file which can contain menus, toolbars, and ribbon tabs among other elements that define the user interface.
Contains named plot settings in the drawing.
Contains all registered applications in the drawing.
Contains all text styles in the drawing.
Contains all user coordinate systems (UCS's) in the drawing.
Contains all views in the drawing.
Contains all viewports in the drawing.