public void SelectionExamples()
{

    //获取数据集，该数据集包含表示人口数量的Pop_1994 字段 
    DatasetVector datasetvector=workspace.Datasources[0].Datasets["World"] as DatasetVector;

    Layer layer = m_mapControl.Map.Layers.Add(datasetvector, true);

    //根据ID进行查询，返回查询结果记录集
    Recordset recordset=datasetvector.Query(new Int32[]{0,1,2,3,4,5,6,7,8,9,10,11,18,19},CursorType.Static);

    //从该记录集获取选择集
    Selection selection=new Selection();
    selection.FromRecordset(recordset);

    // 移除从序号1到10的几何对象
    selection.RemoveRange(1,10);

    //设置选择集的风格
    GeoStyle style=new GeoStyle();
    style.LineColor=Color.Cyan;
    style.LineWidth=3.0;
    selection.Style=style;

    layer.Selection = selection;
    m_mapControl.Map.Refresh();

    //将选择集转化为记录集
    Recordset recordset1=selection.ToRecordset();

    //统计人口最大值
    Double maxValue=recordset1.Statistic("Pop_1994",StatisticMode.Max);
    Console.WriteLine("人口最大值"+maxValue);


    //清空选择集
    selection.Clear();

    //释放资源
    recordset1.Dispose ();
    recordset.Dispose();
    selection.Dispose();      

}