Revit二次开发——拾取常规模型的面

1）过滤器：

	public class FaceFilter : ISelectionFilter
{
    Document doc = null;
    public FaceFilter(Document document)
    {
        doc = document;
    }
    public bool AllowElement(Element elem)
    {
        return true;
    }

    public bool AllowReference(Reference reference, XYZ position)
    {
        if (doc.GetElement(reference).GetGeometryObjectFromReference(reference) is PlanarFace)
        {
            return true;
        }
        return false;
    }
}

2）拾取面

		Reference refer = uidoc.Selection.PickObject(ObjectType.Face,new FaceFilter(revitDoc));
        PlanarFace face = revitDoc.GetElement(refer).GetGeometryObjectFromReference(refer) as PlanarFace;

3）得到面的面积：

double d = face.Area * 0.3048 * 0.3048;