public override void FillDatabase(Teigha.DatabaseServices.Database pDb)
        {
            IFeatureClassContainer pFeatureClassContainer = pCADFeatureDataset as IFeatureClassContainer;
            IEnumFeatureClass pEnumFeatureClass = pFeatureClassContainer.Classes;
            IFeatureClass pFeatureClass = pEnumFeatureClass.Next();

            while (pFeatureClass != null)
            {               
                LoadLayer(pFeatureClass, pDb);
                Debug.WriteLine(pFeatureClass.FeatureType.ToString() + "-" + pFeatureClass.AliasName + "-" + pFeatureClass.ShapeType.ToString());
                pFeatureClass = pEnumFeatureClass.Next();
            }
        }
        private void LoadLayer(IFeatureClass pFeatureClass, Teigha.DatabaseServices.Database pDb)
        {

            int indx = pFeatureClass.FindField("Layer");
            int idxColor = pFeatureClass.FindField("Color");
            int idxText = pFeatureClass.FindField("TxtMemo");
            int idxHandle = pFeatureClass.FindField("Handle");

            pCursor = pFeatureClass.Search(null, false);
            IFeature pFeature2 = pCursor.NextFeature();
            //写入点线

          if (pFeatureClass.FeatureType == esriFeatureType.esriFTCoverageAnnotation)
                {
                    while (pFeature2 != null)
                    {
                        string geoName = "C_" + pFeature2.get_Value(indx).ToString();
                        string sAnnotation = pFeature2.get_Value(idxText).ToString();
                        IPoint pPoint = pFeature2.Shape as IPoint;
                        double x = 0, y = 0;
                        pPoint.QueryCoords(out x, out y);
                        Point3d pt = new Point3d(x, y, 0);
                        addTextEnt(modelSpaceId, pt, pt, sAnnotation, 2, TextHorizontalMode.TextLeft, TextVerticalMode.TextTop, LayerNames[geoName], ttfStyleId);
                        pFeature2 = pCursor.NextFeature();
                    }
                }
                else
                {
                    if (pFeatureClass.ShapeType == esriGeometryType.esriGeometryPoint)
                    {
                        while (pFeature2 != null)
                        {
                            IPoint pt = pFeature2.Shape as IPoint;
                            pFeature2 = pCursor.NextFeature();
                        }
                    }
                    else if (pFeatureClass.ShapeType == esriGeometryType.esriGeometryPolyline)
                    {
                        short shtColor = 1;
                        while ((pFeature2 = pCursor.NextFeature()) != null)
                        {
                            string geoName = "C_" + pFeature2.get_Value(indx).ToString();
                        }
                    }
                    else if (pFeatureClass.ShapeType == esriGeometryType.esriGeometryPolygon)
                    {
                        short shtColor = 1;
                        while ((pFeature2 = pCursor.NextFeature()) != null)
                        {
                            string geoName = "C_" + pFeature2.get_Value(indx).ToString();                           
                        }
                    }
            }
           System.Runtime.InteropServices.Marshal.ReleaseComObject(pCursor);
            pCursor = null;
        }
    }