performance at arcgis silverlight api

Question

I am using GraphicsLayer for road symbology with SimpleLineSymbol. my code is same with below code:

    for (int i = 0; i < 200000; i++)
    {
        myGraphicsLayer.Graphics[i].Symbol = mySimpleLineSymbol;
    }

this code run fast but draw linesymbol on map is very slow.(Approximately 6 sec). please help me for increase symbology performance.

Answer 1

I collect all geometry into one polyline and create one graphic for that. then i create symbol and display.It takes one second for rendering and display on map.

        var myPolyline = new ESRI.ArcGIS.Client.Geometry.Polyline();

        for (int i = 0; i < 200000; i++)
        {
            myPolyline.Paths.Add(((ESRI.ArcGIS.Client.Geometry.Polyline)myGraphicsLayer.Graphics[i].Geometry).Paths[0]);
        }

        Graphic myGraph = new Graphic();

        myGraph.Geometry = myPolyline;

        ESRI.ArcGIS.Client.Symbols.SimpleLineSymbol sym = new ESRI.ArcGIS.Client.Symbols.SimpleLineSymbol();

        sym.Color = new SolidColorBrush(Colors.Red);

        sym.Width = 2;

        myGraph.Symbol = sym;

        myGraphicsLayer.Graphics.Add(myGraph);