topic Re: Problem with Graphics Layer in ArcGIS API for Silverlight Questions

Problem with Graphics Layer

JaredWhite — Fri, 18 May 2012 20:17:15 GMT

Hi,
I'm having a problem my graphicslayers not displaying any query results, drawing functions work just fine. I believe it's something server side because i've copied and pasted sample query code from the api samples, tested and run perfectly with the default map services, then tested and failed with my own map services. My map service is dynamic and running on server 10.1, also it works perfectly in every other aspect. What could possibly be causing this problem?

Re: Problem with Graphics Layer

JaredWhite — Fri, 18 May 2012 20:23:19 GMT

also, all layers on the service support both query and generate renderer operations.

Re: Problem with Graphics Layer

JenniferNery — Fri, 18 May 2012 23:57:31 GMT

In the ExecuteCompleted, do you get any Features in e.FeatureSet? If yes, did you have Query.ReturnGeometry = true and set Query.OutSpatialReference to your Map.SpatialReference? If yes, does your GraphicsLayer have Renderer defined and does the symbol match geometry (i.e. FillSymbol for Polygon, LineSymbol for Polyline, MarkerSymbol for MapPoint, etc)?

Re: Problem with Graphics Layer

JaredWhite — Mon, 21 May 2012 12:10:06 GMT

Yes to all of those things, I really believe this is server side, i just published another map service using the same data for a single layer from the problem map. renders just fine while if i throw too many of the layers together it doesn't render well at all. could the fact that the map service uses 12 layers be causing issues?

Re: Problem with Graphics Layer

JaredWhite — Mon, 21 May 2012 13:52:35 GMT

Somehow fixed it, I changed the symbology on map side of service and that did the trick for some reason. Not a good fix, but it's working now.

Re: Problem with Graphics Layer

JaredWhite — Mon, 21 May 2012 17:04:22 GMT

Ok, problem quickly returned, but atleast i have the debug telling me theres a problem now. I get this message in this location.
Keep in mind I'm using the eaxct same code from the samples gallery, except i'm using my service addresses instead of the default ones. If i remove the graphic renderer it runs just fine.
[ATTACH=CONFIG]14490[/ATTACH]
Any help would be greatly appreciated.

Re: Problem with Graphics Layer

JaredWhite — Sun, 12 Dec 2021 02:20:22 GMT

Solved
Changed code to

 private void FindDetails_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // Highlight the graphic feature associated with the selected row
            DataGrid dataGrid = sender as DataGrid;
            GraphicsLayer graphicsLayer = MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer;
            graphicsLayer.ClearGraphics();
            int selectedIndex = dataGrid.SelectedIndex;
            if (selectedIndex >= 0)
            {
                FindResult findResult = (FindResult)FindDetailsDataGrid.SelectedItem;
                Graphic graphic = findResult.Feature;
                {
                    graphic.Symbol = LayoutRoot.Resources["DefaultFillSymbol"] as FillSymbol;
                    graphicsLayer.Graphics.Insert(0, graphic);
                }

                
                graphicsLayer.Graphics.Add(graphic);

              
            }
        }

from original sample code. Don't know why the other code didn't work, but this works just fine.

Re: Problem with Graphics Layer

DominiqueBroux — Sun, 12 Dec 2021 02:20:25 GMT

                Graphic graphic = findResult.Feature;
                {
                    graphic.Symbol = LayoutRoot.Resources["DefaultFillSymbol"] as FillSymbol;
                    graphicsLayer.Graphics.Insert(0, graphic);
                }

                
                graphicsLayer.Graphics.Add(graphic);

Side remark : you are inserting twice the same graphic, not that important, but...