VC环境中MapX一次删除图层所有图元

CMapXLayer layer = m_ctrlMapX.GetLayers().Item("user");
layer.SetEditable(TRUE);
CMapXFeature fea;
CMapXFeatures features;

do{
features=layer.AllFeatures();
fea =features.Item(1);
layer.DeleteFeature(fea);
}
while(layer.AllFeatures().GetCount()>0);
layer.Refresh();