revit二次开发之三 获取元素的位置

Element.Location属性用来获取元素的位置，Location可以转化为LocationPoint和LocationCurve,如何这个元素是点，则转化为LocationPoint，如果是直线或者曲线则转化为LocationCurve

Wall w = new Wall();
Curve c=(w.Location as LocationCurve).Curve;

Opening o = new Opening();
XYZ p = (o.Location as LocationPoint).Point;