IFields pFields = m_FeatureClass.Fields;

            int index = pFields.FindField(m_strHeight);

            if (index == -1) return;

            IField pField = pFields.get_Field(index);

            IGeoDataset pGeoDataset = m_FeatureClass as IGeoDataset;

            IEnvelope pEnvelope = pGeoDataset.Extent;

            pEnvelope.SpatialReference = pGeoDataset.SpatialReference;

            ITinEdit pTinEdit = new TinClass();

            pTinEdit.InitNew(pEnvelope);

            object obj =Type.Missing;

            pTinEdit.AddFromFeatureClass(m_FeatureClass, null, pField, null, esriTinSurfaceType.esriTinMassPoint, ref obj);

            pTinEdit.SaveAs(@"C:/TIN", ref obj);   // tin的保存

            pTinEdit.StopEditing(false);