topic Re: Silverlight, Identify Task, Map Service in ArcGIS API for Silverlight Questions

Silverlight, Identify Task, Map Service

DavidRoberts1 — Tue, 26 Oct 2010 13:06:11 GMT

I recently implemented an identify tool using the example on the Resource Center (http://resources.esri.com/help/9.3/arcgisserver/apis/silverlight/samples/start.htm#Identify). The tool was working but I am now having a problem with the following code:

foreach (IdentifyResult result in identifyArgs.IdentifyResults)
{
Graphic graphic = AddGraphicToLayer(MyMap.Layers[CUSTOM_GRAPHICS_LAYER_ID] as GraphicsLayer, result.Feature, GetResultsSymbolForGeometry(result.Feature.Geometry),result.LayerName); //ResultsFillSymbol);
}

The foreach loop (taken from the ESRI example) never gets executed because identifyArgs.IdentifyResults is empty.

The only difference between my code and the ESRI code is that I am pulling in my own dynamic map service. I am confident the map service is set up correctly because the layers appear in the application; i.e. can be turned on and off. However, the service does not seem to be working for the identify tool. The line of code used to access the service was taken from the ESRI example.

IdentifyTask identifyTask = new IdentifyTask("http://pc231/example/rest/services/hou/MapServer");

Re: Silverlight, Identify Task, Map Service

AliMirzabeigi — Tue, 26 Oct 2010 16:33:13 GMT

David,

To make sure that your service is behaving correctly I suggest you invoke the Identify task directly from your map service. To do this open your browser and navigate to http://pc231/example/rest/services/hou/MapServer and at the end of the page click on "Identify" link, then pass the parameters like the input you see in Fiddler (passed from your application).

Re: Silverlight, Identify Task, Map Service

DavidRoberts1 — Tue, 26 Oct 2010 18:45:09 GMT

Thanks for the reply. The issue is my service has a different spatial reference than the ESRI map service that I am using for my base layer. Would it be easier to change the spatial reference of my service or convert the Geometry Parameters on Identify to the correct units?

Re: Silverlight, Identify Task, Map Service

DavidRoberts1 — Tue, 26 Oct 2010 19:51:07 GMT

I was able to correct this by stating the spatial reference of the esri map service in code, i.e., "SpatialReferenceWKID=4326"

Thanks again for the help.

Re: Silverlight, Identify Task, Map Service

TerryGiles — Fri, 29 Oct 2010 12:30:06 GMT

Any chance either of you can help with my Identify issue that I described here?

Basically similar sitiuation to David's - running an identify against a layer with a different projection than the map but args.Identify results is NULL even though a) the spatial reference is set for the IdentifyTask and b) I can see correct results coming back in Fiddler. Thanks, Terry