Managing selection of SOLIDWORKS macro feature

public class MacroFeatureParams
{
    //selection parameter of any entity (e.g. face, edge, feature etc.)
    [ParameterSelection]
    public object AnyEntity { get; set; }

    //selection parameter of body
    [ParameterSelection]
    public IBody2 Body { get; set; }

    //selection parameter of array of faces
    [ParameterSelection]
    public List<IFace2> Faces { get; set; }