public void GetFeatureTest(Workspace workspace)
{
    // 获取数据集
    DatasetVector dataset = workspace.Datasources[0].Datasets["World"] as DatasetVector;

    // 得到“World”中 SmID=1 的记录
    Recordset recordset = dataset.Query("SmID=1", CursorType.Static);

    // 获取特征要素 feature
    Feature feature = recordset.GetFeature();

    // 获取特征要素对应的几何对象
    Geometry geometry = feature.GetGeometry();

    // 关闭记录集，释放几何对象、特征要素和记录集
    recordset.Close();
    geometry.Dispose();
    feature.Dispose();
    recordset.Dispose();
}