Question

Datasets datasets = m_datasource.Datasets;
                DatasetVectorInfo vectorInfo = new DatasetVectorInfo();
                vectorInfo.Name = datasetName;
                vectorInfo.Type = DatasetType.Region;
                //添加数据集
                DatasetVector dv = datasets.Create(vectorInfo);
                //给面数据集添加点集合
                Recordset re = dv.Query("1=1", CursorType.Static);
                GeoRegion geo = re.GetGeometry() as GeoRegion;
                Point2Ds d = new Point2Ds();
                d.Add(new Point2D(10, 10));
                geo.AddPart(d);

最后 geo.AddPart(的时候报错，我这是先创建了个面数据集 然后在面数据集中添加组成面的点的信息；为什么到最后报错呢？