几何不能具有Z值

ArcEngine 复制要素Geometry时，产生 几何不能具有Z值 的异常

解决方法：http://forums.esri.com/Thread.asp?c=159&f=1707&t=275474

参考上述帖子。将Geometry中的Z值丢掉即可。

代码如下：

IFeatureBuffer pNewFeatureBuffer = pNewFtCls.CreateFeatureBuffer();
//要素属性复制
IGeometry pGeom = pOldFeature.Shape;
IZAware pZaware = pGeom as IZAware;
pZaware.DropZs();
pZaware.ZAware = false;
pNewFeatureBuffer.Shape = pGeom;