实现在C#程序中实现自定义图例功能

 //public void Addtuli(ESRI.ArcGIS.Carto.IPageLayout pageLayout, ESRI.ArcGIS.Carto.IMap map, IPoint pPoint)
        //{
        //    if (pageLayout == null || map == null)
        //    {
        //        return;
        //    }
        //    IActiveView activeView = pageLayout as IActiveView;
        //    //定义图例UID对象
        //    UID uid = new UID();
        //    uid.Value = "esriCore.Legend";
        //    //设置图例存放的坐标位置
        //    //定义单位
        //    pageLayout.Page.Units = esriUnits.esriCentimeters;
        //    //得到草图容器对象
        //    IGraphicsContainer container = pageLayout as IGraphicsContainer;
        //    //得到当前地图的框架
        //    IMapFrame frameElement = container.FindFrame(activeView.FocusMap) as IMapFrame;
        //    IElement mapElement = frameElement as IElement;
        //    IEnvelope mapEnv = mapElement.Geometry.Envelope;
        //    IEnvelope envelope = new EnvelopeClass();
        //    //通过当前地图框架得到相对位置
        //    envelope.PutCoords(mapEnv.XMin, mapEnv.XMin, mapEnv.XMin + 6.5, mapEnv.YMin + 0.8);
        //    IMapSurroundFrame frame = frameElement.CreateSurroundFrame(uid, null);
        //    ILegend legend = frame.MapSurround as ILegend;           
        //    ILegendFormat format = new LegendFormatClass();
        //    format.TitlePosition = esriRectanglePosition.esriTopSide;
        //    format.LayerNameGap = 0.0;
        //    format.TextGap = 0.0;
        //    format.TitleGap = 15;
        //    format.HeadingGap = 5;