创建注记图层要素

                    IFeatureClass annocls = 获取注记图层
                    IDataset pDataset = annocls as IDataset;
                    ITransactions pTransactions = pDataset.Workspace as ITransactions;
                    pTransactions.StartTransaction();
                    IFDOGraphicsLayerFactory pFDOGLFactory = new FDOGraphicsLayerFactoryClass();
                    ILayer tmpLayer = pFDOGLFactory.OpenGraphicsLayer(pDataset.Workspace as IFeatureWorkspace, annocls.FeatureDataset, pDataset.Name);
                    IFDOGraphicsLayer pFDOGLayer = tmpLayer as IFDOGraphicsLayer;
                    IElementCollection pElementColl = new ElementCollectionClass();
                    pFDOGLayer.BeginAddElements();
            ////每新增100个提交下，最后再提交下。防止过多转换失败
            if ((pElementColl != null) && (pElementColl.Count == 100))
            {
                pFDOGLayer.DoAddElements(pElementColl, 0);
                pFDOGLayer.EndAddElements();
                pElementColl.Clear();
                pTransactions.CommitTransaction();
                pTransactions.StartTransaction();
                pFDOGLayer.BeginAddElements();
            }
                    if (pElementColl.Count > 0)
                        pFDOGLayer.DoAddElements(pElementColl, 0);
                    pFDOGLayer.EndAddElements();
                    pElementColl.Clear();
                    pTransactions.CommitTransaction();