public void GeoNorthArrowExample(Workspace workspace)
{
    //获取工作空间中的地图
    Map map = new Map(workspace);
    map.Open(workspace.Maps[0]);

    //构造二维几何对象，设置中心点（500，500），宽度（1000），高度（1000）
    GeoRectangle geoRectangle = new GeoRectangle(new Point2D(500, 500), 1000, 1000, 0);
    //通过name和二维几何对象构造地图几何对象
    GeoMap geoMap = new GeoMap();
    geoMap.MapName = map.Name;
    geoMap.Shape = geoRectangle;

    //将地图几何对象添加到布局元素集合中
    MapLayoutControl mapLayoutControl = new MapLayoutControl();
    MapLayout mapLayout = mapLayoutControl.MapLayout;
    mapLayout.Workspace = workspace;
    mapLayout.Elements.AddNew(geoMap);

    //通过地图几何对象的ID和矩形对象构造指北针对象
    Rectangle2D rectangle2D = new Rectangle2D(900, 900, 1000, 1000);
    Int32 id=mapLayout.Elements.GetID();
    GeoNorthArrow geoNorthArrow = new GeoNorthArrow(id, NorthArrowStyleType.FourDirectionWithCircle, rectangle2D);

    //将指北针几何对象添加到布局
    mapLayout.Elements.AddNew(geoNorthArrow);

    //显示布局窗口
    this.Controls.Add(mapLayoutControl);
    mapLayoutControl.Dock = DockStyle.Fill;
}