有高程点数据，想生成等高线数据后再生成TIN

ESRI.ArcGIS.Geodatabase.ITinEdit tinEdit = new ESRI.ArcGIS.Geodatabase.TinClass();
tinEdit.InitNew(axMapControl1.Extent);

            for (int i = 0; i < pointZ.PointCount; i++)
            {
                tinEdit.AddPointZ(pointZ.get_Point(i),i);
            }

            object o = Type.Missing;
            for (int i = 0; i < _handLine.SegmentCount; i++)
            {
                IPolyline polyline = new PolylineClass();
                polyline.FromPoint = _handLine.get_Segment(i).FromPoint;
                polyline.ToPoint = _handLine.get_Segment(i).ToPoint;
                tinEdit.AddShape(polyline, ESRI.ArcGIS.Geodatabase.esriTinSurfaceType.esriTinHardLine, i, ref o);
            }

            o = true;
            tinEdit.SaveAs(@"e:\ss", ref o);
            tinEdit.StopEditing(true);
            MessageBox.Show(@"TIN已成功保存在e:\ss下");