arcgis engine如何加载天地图

可参考下面代码：

            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();