This wraps the ObjectARX AcDbAssocParamBasedActionBody class.

Autodesk.AutoCAD.DatabaseServices.DBObject
    Autodesk.AutoCAD.DatabaseServices.AssocActionBody
        Autodesk.AutoCAD.DatabaseServices.AssocParamBasedActionBody
            Autodesk.AutoCAD.DatabaseServices.AssocSurfaceActionBody

Public abstract Class AssocParamBasedActionBody
Inherits AssocActionBody

public abstract class AssocParamBasedActionBody : AssocActionBody;