I am getting an "Object reference not set to an instance of an object." exception at StackTrace " at ESRI.ArcGIS.Client.DrawingSurface..ctor(Single dpi)\r\n at ESRI.ArcGIS.Client.AcceleratedDisplayLayers.Initialize() stringas reported in the InitializationFailed handler for my AcceleratedDisplayLayers group.A sample xaml is provided below. Basically the example below works perfectly fine when I move the local feature layer outside of the AcceleratedDisplayLayers group. If I keep it in the accelerated layers I get the exception. It should also be noted that my base application is a WinForms app so I have my map in a WPF control that is hosted in my form using ElementHost. I can take the markup below and set it up in a new WPF application and it seems to work as is? Very strange... Hopefully someone else has run into this and has some insight!Edit: I have now referenced the project containing the WPF control that is giving me the exception to my WPF test project and can load up the control just fine in a WPF window with no initialization exception. Accelerated layers support doesn't seem to like being hosted in a WinForm via ElementHost. <Grid x:Name="LayoutRoot" Background="#FFE6E6E6" HorizontalAlignment="Stretch"> <Grid.Resources> <esri:LocalFeatureService x:Key="FeatureService" Path="USCitiesStates.mpk" MaxRecords="30000" /> <esri:SimpleRenderer x:Key="MySimplePolygonRenderer"> <esri:SimpleRenderer.Symbol> <esri:SimpleFillSymbol Fill="#440000FF" /> </esri:SimpleRenderer.Symbol> </esri:SimpleRenderer> </Grid.Resources> <esri:Map x:Name="arcMap" Background="#FFE3E3E3" MinimumResolution="0.1"> <esri:AcceleratedDisplayLayers InitializationFailed="AcceleratedDisplayLayers_InitializationFailed"> <esri:ArcGISLocalFeatureLayer ID="States" Service="{StaticResource FeatureService}" LayerName="States" IsHitTestVisible="False" Renderer="{StaticResource MySimplePolygonRenderer}" OutFields="*"/> </esri:AcceleratedDisplayLayers> </esri:Map> </Grid>
