Layer doesn't come in particular areas

TahaSözgen — Fri, 21 Feb 2014 08:48:16 GMT

Hi There;
I would like to salutate all users of arcgis in my first thread. I am implementing some codes of the Arcgis api for silverlight, and I've encountered a problem. In the project, map of USA appear on the screen. Assumed scenerio is prints US state name when user clicks inside USA, prints coordinates when user clicks outside of the USA. However when I clicked outside of the country, there is no graphics comes. How can I handle the problem? Thanks in advance.

Here is the content of the xaml:
[HTML]
    <Grid x:Name="LayoutRoot">

        <Grid.Resources>

            <esri:SimpleRenderer x:Key="MySimpleRenderer">

                <esri:SimpleRenderer.Symbol>
                    <esri:SimpleFillSymbol Fill="#01FFFFFF" BorderBrush="#88000000" BorderThickness="2" />
                </esri:SimpleRenderer.Symbol>
            </esri:SimpleRenderer>

            
            <DataTemplate x:Key="LocationInfoWindowTemplate">
                <StackPanel Margin="2">
                    <TextBlock Text="Location:" />
                    <TextBlock Text="{Binding X, StringFormat=X\=\{0:0.000\}}" />
                    <TextBlock Text="{Binding Y, StringFormat=Y\=\{0:0.000\}}" />
                </StackPanel>
            </DataTemplate>

            
            <DataTemplate x:Key="MyFeatureLayerInfoWindowTemplate">
                <TextBlock Text="{Binding [STATE_NAME]}" Foreground="Black" FontSize="12" />
            </DataTemplate>
        </Grid.Resources>

        <esri:Map x:Name="MyMap" WrapAround="False" Extent="-15000000,2000000,-7000000,8000000" MouseClick="MyMap_MouseClick">
            <esri:ArcGISTiledMapServiceLayer ID="Street Map"
                    Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer"/>

            <esri:FeatureLayer ID="MyFeatureLayer"
                               Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5"
                               OutFields="STATE_NAME,POP2007"
                               Renderer="{StaticResource MySimpleRenderer}"
                                />
        </esri:Map>

        
        <esri:InfoWindow x:Name="MyInfoWindow"
                         Padding="2"
                         CornerRadius="20"
                         Background="LightSalmon"
                         Map="{Binding ElementName=MyMap}"
                         ContentTemplate="{StaticResource MyFeatureLayerInfoWindowTemplate}"
                         MouseLeftButtonUp="MyInfoWindow_MouseLeftButtonUp" />
    </Grid>
[/HTML]

here is the code behind:

   private void MyMap_MouseClick(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e)         {             FeatureLayer featureLayer = (FeatureLayer) MyMap.Layers["MyFeatureLayer"];             System.Windows.Point screenPnt = MyMap.MapToScreen(e.MapPoint);              GeneralTransform generalTransform = MyMap.TransformToVisual(Application.Current.RootVisual);              System.Windows.Point transformScreenPnt = generalTransform.Transform(screenPnt);              IEnumerable<Graphic> selected = featureLayer.FindGraphicsInHostCoordinates(transformScreenPnt);             //Here is the actual error point. When user clicks outside of the USA selected is null.             foreach (Graphic g in selected)             {                  MyInfoWindow.Anchor = e.MapPoint;                 MyInfoWindow.IsOpen = true;                 //Since a ContentTemplate is defined, Content will define the DataContext for the ContentTemplate                 MyInfoWindow.Content = g.Attributes;                 return;             }                      }

Re: Layer doesn't come in particular areas

AhmedEl-Sisi — Sun, 23 Feb 2014 05:26:04 GMT

You should check graphics count and then switch between your Info Window content templates.

Something like this:

   private void MyMap_MouseClick(object sender, ESRI.ArcGIS.Client.Map.MouseEventArgs e)         {                          FeatureLayer featureLayer = (FeatureLayer)MyMap.Layers["MyFeatureLayer"];             System.Windows.Point screenPnt = MyMap.MapToScreen(e.MapPoint);              GeneralTransform generalTransform = MyMap.TransformToVisual(Application.Current.RootVisual);              System.Windows.Point transformScreenPnt = generalTransform.Transform(screenPnt);              IEnumerable<Graphic> selected = featureLayer.FindGraphicsInHostCoordinates(transformScreenPnt);              //Here is the actual error point. When user clicks outside of the USA selected is null.            var selectionEnum= selected.GetEnumerator();            if (!selectionEnum.MoveNext())            {                MyInfoWindow.ContentTemplate = LayoutRoot.Resources["LocationInfoWindowTemplate"] as DataTemplate;                 MyInfoWindow.Anchor = e.MapPoint;                 MyInfoWindow.IsOpen = true;                 //Since a ContentTemplate is defined, Content will define the DataContext for the ContentTemplate                 MyInfoWindow.Content = e.MapPoint;                 return;            }             foreach (Graphic g in selected)             {                 MyInfoWindow.ContentTemplate = LayoutRoot.Resources["MyFeatureLayerInfoWindowTemplate"] as DataTemplate;                 MyInfoWindow.Anchor = e.MapPoint;                 MyInfoWindow.IsOpen = true;                 //Since a ContentTemplate is defined, Content will define the DataContext for the ContentTemplate                 MyInfoWindow.Content = g.Attributes;                 return;             }          }

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Layer doesn't come in particular areas

Re: Layer doesn't come in particular areas