topic Re: Address locator issue in search result envelope zooming in ArcGIS API for Silverlight Questions

Address locator issue in search result envelope zooming

shariqueabdul — Thu, 08 Nov 2012 07:44:43 GMT

Hi All

I m getting null exception error in this following code

Private Sub QueryTaskZoomSearch_ExecuteCompleted(ByVal sender As Object, ByVal args As ESRI.ArcGIS.Client.Tasks.QueryEventArgs)
        Dim featureSet1 As FeatureSet = args.FeatureSet


        Dim graphicsLayer As GraphicsLayer = TryCast(MyMap.Layers("MyGraphicsLayer"), GraphicsLayer)
        graphicsLayer.ClearGraphics()

        If featureSet1 IsNot Nothing AndAlso featureSet1.Features.Count > 0 Then


            Dim selectedFeature As Graphic = New Graphic
            selectedFeature = featureSet1.Features(1)


            Select Case featureSet1.GeometryType
                Case GeometryType.Point : selectedFeature.Symbol = DefaultMarkerSymbol
                Case GeometryType.Polygon : selectedFeature.Symbol = DefaultFillSymbol
                Case GeometryType.Polyline : selectedFeature.Symbol = DefaultLineSymbol
                Case GeometryType.Envelope : selectedFeature.Symbol = DefaultMarkerSymbol   // here it shows nothing in envelope
            End Select
            'selectedFeature.Symbol = DefaultFillSymbol

            graphicsLayer.Graphics.Add(selectedFeature)

            ' Zoom to selected feature (define expand percentage)
            Dim selectedFeatureExtent As ESRI.ArcGIS.Client.Geometry.Envelope = selectedFeature.Geometry.Extent

getting error in underline text .... object refernce is not set to an instance of an object

plz help

Re: Address locator issue in search result envelope zooming

DominiqueBroux — Thu, 08 Nov 2012 09:44:57 GMT

May be your featureset has only one feature so you should use

selectedFeature = featureSet1.Features(0)

Re: Address locator issue in search result envelope zooming

shariqueabdul — Thu, 08 Nov 2012 11:09:18 GMT

May be your featureset has only one feature so you should use
selectedFeature = featureSet1.Features(0)

Thanx dbroux for prompt reply

i checked with selectedFeature = featureSet1.Features(0) but still same error

plz help
thank you

Re: Address locator issue in search result envelope zooming

deleted-user-ATjHIWsdQYmT — Fri, 09 Nov 2012 12:34:21 GMT

Is the selected feature's geometry a point? if so then the geometry has no extent. It's just a point. If it is a point, try using selectedFeature.Geometry.Extent.Expand(10). You might need to adjust the expand ratio to your liking.