Engine中如何加载WMTS服务？

IPropertySet pPropertyset = new PropertySetClass();

pPropertyset.SetProperty(url, http://t0.tianditu.com/vec_c/wmts);    

IWMTSConnectionFactory pWMTSConnectionfactory = new WMTSConnectionFactory();

IWMTSConnection pWMTSConnection = pWMTSConnectionfactory.Open(pPropertyset, 0, null);

IWMTSLayer pWMTSLayer = new WMTSLayer();

IName pName = pWMTSConnection.FullName;

pWMTSLayer.Connect(pName);

            

axMapControl1.AddLayer(pWMTSLayer as ILayer);

axMapControl1.Refresh();