topic Re: Query Attributes Tool No longer works with SL 2.0 and ArcGIS 10.0 REST in ArcGIS API for Silverlight Questions

Query Attributes Tool No longer works with SL 2.0 and ArcGIS 10.0 REST

BrockTerry — Mon, 23 Aug 2010 15:41:35 GMT

I've noticed that the "Query Attributes" tool is throwing an error when I tie the tool to a ArcGIS 10 REST service. If I point the code at a 9.3.1 REST service it works fine.

The project will build with no errors but when I use the tool and select an attribute it stops at this line of code in the .cs page:

// Zoom to selected feature (define expand percentage)
ESRI.ArcGIS.Client.Geometry.Envelope selectedFeatureExtent = selectedFeature.Geometry.Extent;

Re: Query Attributes Tool No longer works with SL 2.0 and ArcGIS 10.0 REST

BrockTerry — Mon, 23 Aug 2010 15:53:21 GMT

This is the error that I get:

System.NullReferenceException was unhandled by user code
Message=Object reference not set to an instance of an object.
StackTrace:
       at Standard.MainPage.QueryTask_ExecuteCompleted(Object sender, QueryEventArgs args)
       at ESRI.ArcGIS.Client.Tasks.QueryTask.OnExecuteCompleted(QueryEventArgs args)
       at ESRI.ArcGIS.Client.Tasks.QueryTask.request_Completed(Object sender, RequestEventArgs e)
       at ESRI.ArcGIS.Client.Tasks.TaskBase.request_Completed(Object sender, RequestEventArgs e)
       at ESRI.ArcGIS.Client.WebRequest.OnComplete(RequestEventArgs args)
       at ESRI.ArcGIS.Client.WebRequest.downloadStringCompleted(Object sender, DownloadStringCompletedEventArgs e)
       at System.Net.WebClient.OnDownloadStringCompleted(DownloadStringCompletedEventArgs e)
       at System.Net.WebClient.DownloadStringOperationCompleted(Object arg)
InnerException:

Re: Query Attributes Tool No longer works with SL 2.0 and ArcGIS 10.0 REST

BrianGustafson — Tue, 24 Aug 2010 18:09:41 GMT

Try explicitly setting the return geometry = true in your query parameters. Is your selected features geometry attribute null?

Re: Query Attributes Tool No longer works with SL 2.0 and ArcGIS 10.0 REST

BrockTerry — Wed, 25 Aug 2010 16:35:40 GMT

That did the trick!

Thanks so much.