Public ReadOnly Property Attributes As IDictionary(Of String,Object)

public IDictionary<string,object> Attributes {get;}

<Grid x:Name="LayoutRoot">
  
  <!-- 
  Add a Map control with an ArcGISTiledMapServiceLayer. Set the Map.Extent to that of the Continental United 
  States using the Spatial Reference WKT of 102100 coordinate values.
  -->
  <esri:Map Background="White" HorizontalAlignment="Left" Margin="12,136,0,0" Name="Map1" 
            VerticalAlignment="Top" Height="318" Width="518" 
            Extent="-14319453,2145784,-6782898,6772471">
    <esri:ArcGISTiledMapServiceLayer ID="PhysicalTiledLayer"
                   Url="http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer" />
  </esri:Map>
  
  <!-- Provide the instructions on how to use the sample code. -->
  <TextBlock Height="72" HorizontalAlignment="Left" Name="TextBlock1" VerticalAlignment="Top" Width="503" 
             TextWrapping="Wrap" Margin="12,29,0,0" 
             Text="Click the button to perform a QueryTask web service. The function will iterate over the 
             resulting FeatureSet from the web service to symbolize the Graphics based upon Attribute
             values. States populations will be displayed in Red (high), Yellow (medium) and Blue (low)." />
  
  <!-- Add a Button to perform the work. Note the Click Event handler is wired-up to use code-behind. -->
  <Button Content="Draw Graphics symbolized based upon Attribute values from a FeatureData Service" 
          Height="23" HorizontalAlignment="Left" Margin="12,107,0,0" Name="Button2" 
          VerticalAlignment="Top" Width="518" Click="Button2_Click"/>
  
</Grid>

private void Button2_Click(object sender, System.Windows.RoutedEventArgs e)
{
  // This function will execute a QueryTask Asynchronously to obtain all of the US States from an ArcGIS Server 
  // web service.
  
  // When performing a ESRI.ArcGIS.Client.Tasks.Query use the Query.Geometry Property for the  web service that 
  // corresponds to the dataset being queried 
  // (i.e. http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5).
  // In this example, the web service is based upon Spatial Reference WKT of 4269 which uses standard latitude 
  // longitude spherical coordinates (i.e. -180 to 180). 
  // The Query.OutSpatialReference Property defines what the returned FeatureSet from the web service will be in. 
  // In this example the data will be projected to Spatial Reference WKT of 102100 which uses a Web Mercator 
  // Auxiliary Sphere.
  ESRI.ArcGIS.Client.Tasks.Query query = new ESRI.ArcGIS.Client.Tasks.Query() With;
  { 
    .Geometry = new ESRI.ArcGIS.Client.Geometry.Envelope(-180, 0, 0, 90), 
    .OutSpatialReference == Map1.SpatialReference 
  };
  
  // Specify that all of the Attributes from the web service FeatureSet will be returned.
  query.OutFields.Add("*");
  
  // Define the QueryTask by specifying the URL of the FeatureLayer to be queried.
  ESRI.ArcGIS.Client.Tasks.QueryTask queryTask = new ESRI.ArcGIS.Client.Tasks.QueryTask("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5");
  
  // Wire up an Event Handler that will execute when the Query Task is completed from the web service. 
  queryTask.ExecuteCompleted += StatesGraphicsLayerQueryTask_ExecuteCompleted;
  
  // Execute the QueryTask Asymchronously.
  queryTask.ExecuteAsync(query);
}
            
private void StatesGraphicsLayerQueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs queryArgs)
{
  // This function executes after the QueryTask has completed. If there is a valid FeatureSet returned then 
  // symbolize the US States based upon the Attribute of "POP2007" (i.e. Population count for the year 2007).
  
  // Check to ensure we have valid return results.
  if (queryArgs.FeatureSet == null)
  {
  return;
  }
  
  // Obtain a FeatureSet from the queryArgs returned from the web service.
  ESRI.ArcGIS.Client.Tasks.FeatureSet resultFeatureSet = queryArgs.FeatureSet;
  
  // Create three different SimpleFillSymbols to visually display what US States have High, Medium, and
  // Low populations.
  ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol aSimpleFillSymbol_High = new ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol();
  System.Windows.Media.SolidColorBrush aSolidColorBrush_Red = new System.Windows.Media.SolidColorBrush(Colors.Red);
  aSolidColorBrush_Red.Opacity = 0.5;
  aSimpleFillSymbol_High.Fill = aSolidColorBrush_Red;
  
  ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol aSimpleFillSymbol_Medium = new ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol();
  System.Windows.Media.SolidColorBrush aSolidColorBrush_Yellow = new System.Windows.Media.SolidColorBrush(Colors.Yellow);
  aSolidColorBrush_Yellow.Opacity = 0.5;
  aSimpleFillSymbol_Medium.Fill = aSolidColorBrush_Yellow;
  
  ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol aSimpleFillSymbol_Low = new ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol();
  System.Windows.Media.SolidColorBrush aSolidColorBrush_Blue = new System.Windows.Media.SolidColorBrush(Colors.Blue);
  aSolidColorBrush_Blue.Opacity = 0.5;
  aSimpleFillSymbol_Low.Fill = aSolidColorBrush_Blue;
  
  // Create a new GraphicsLayer to add to the Map Control. The individual Graphic objects will come
  // from the returned FeatureSet.
  ESRI.ArcGIS.Client.GraphicsLayer myGraphicsLayer = new ESRI.ArcGIS.Client.GraphicsLayer();
  
  // Ensure the we have a FeatureSet with data.
  if (resultFeatureSet != null & resultFeatureSet.Features.Count > 0)
  {
    // Iterate over each feature (which is a Graphic object) in the FeatureSet.
    foreach (ESRI.ArcGIS.Client.Graphic graphicFeature in resultFeatureSet.Features)
    {
      // Determine which US State based upon their Attribute "POP2007" value will be assigned a specific 
      // SimpleFillSymbol. 
      if (graphicFeature.Attributes["POP2007"] > 15000000)
      {
        graphicFeature.Symbol = aSimpleFillSymbol_High as ESRI.ArcGIS.Client.Symbols.Symbol;
      }
      else if (graphicFeature.Attributes["POP2007"] > 5000000)
      {
        graphicFeature.Symbol = aSimpleFillSymbol_Medium as ESRI.ArcGIS.Client.Symbols.Symbol;
      }
      else
      {
        graphicFeature.Symbol = aSimpleFillSymbol_Low as ESRI.ArcGIS.Client.Symbols.Symbol;
      }
      
      // // Note: there are numerous graphicFeature.Attribute items that can be used for symbolization.
      // // As an experiment try uncommenting the next few lines of code to see all of the different 
      // // types of attribute information available.
      //Text.StringBuilder myStringBuilderDisplayText = new Text.StringBuilder();
      //System.Collections.Generic.IDictionary<string, object> allAttributes = graphicFeature.Attributes;
      //foreach (string oneKey in allAttributes.Keys)
      //{
      //  object theValue = allAttributes[oneKey];
      //  myStringBuilderDisplayText.Append(oneKey + ": " + theValue.ToString() + Environment.NewLine);
      //}
      //MessageBox.Show(myStringBuilderDisplayText.ToString());
      
      // Add the Graphic to the GraphicsLayer
      myGraphicsLayer.Graphics.Add(graphicFeature);
    }
  }
  
  // Add the GraphicsLayer to the Map. It will automatically draw, there is not a need for a refresh.
  Map1.Layers.Add(myGraphicsLayer);
}

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
  
  ' This function will execute a QueryTask Asynchronously to obtain all of the US States from an ArcGIS Server 
  ' web service.
  
  ' When performing a ESRI.ArcGIS.Client.Tasks.Query use the Query.Geometry Property for the  web service that 
  ' corresponds to the dataset being queried 
  ' (i.e. http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5).
  ' In this example, the web service is based upon Spatial Reference WKT of 4269 which uses standard latitude 
  ' longitude spherical coordinates (i.e. -180 to 180). 
  ' The Query.OutSpatialReference Property defines what the returned FeatureSet from the web service will be in. 
  ' In this example the data will be projected to Spatial Reference WKT of 102100 which uses a Web Mercator 
  ' Auxiliary Sphere.
  Dim query As New ESRI.ArcGIS.Client.Tasks.Query() With
  {
    .Geometry = New ESRI.ArcGIS.Client.Geometry.Envelope(-180, 0, 0, 90),
    .OutSpatialReference = Map1.SpatialReference
  }
  
  ' Specify that all of the Attributes from the web service FeatureSet will be returned.
  query.OutFields.Add("*")
  
  ' Define the QueryTask by specifying the URL of the FeatureLayer to be queried.
  Dim queryTask As New ESRI.ArcGIS.Client.Tasks.QueryTask("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5")
  
  ' Wire up an Event Handler that will execute when the Query Task is completed from the web service. 
  AddHandler queryTask.ExecuteCompleted, AddressOf StatesGraphicsLayerQueryTask_ExecuteCompleted
  
  ' Execute the QueryTask Asymchronously.
  queryTask.ExecuteAsync(query)
End Sub
  
Private Sub StatesGraphicsLayerQueryTask_ExecuteCompleted(ByVal sender As Object, ByVal queryArgs As ESRI.ArcGIS.Client.Tasks.QueryEventArgs)
  
  ' This function executes after the QueryTask has completed. If there is a valid FeatureSet returned then 
  ' symbolize the US States based upon the Attribute of "POP2007" (i.e. Population count for the year 2007).
  
  ' Check to ensure we have valid return results.
  If queryArgs.FeatureSet Is Nothing Then
    Return
  End If
  
  ' Obtain a FeatureSet from the queryArgs returned from the web service.
  Dim resultFeatureSet As ESRI.ArcGIS.Client.Tasks.FeatureSet = queryArgs.FeatureSet
  
  ' Create three different SimpleFillSymbols to visually display what US States have High, Medium, and
  ' Low populations.
  Dim aSimpleFillSymbol_High As New ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol
  Dim aSolidColorBrush_Red As New System.Windows.Media.SolidColorBrush(Colors.Red)
  aSolidColorBrush_Red.Opacity = 0.5
  aSimpleFillSymbol_High.Fill = aSolidColorBrush_Red
  
  Dim aSimpleFillSymbol_Medium As New ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol
  Dim aSolidColorBrush_Yellow As New System.Windows.Media.SolidColorBrush(Colors.Yellow)
  aSolidColorBrush_Yellow.Opacity = 0.5
  aSimpleFillSymbol_Medium.Fill = aSolidColorBrush_Yellow
  
  Dim aSimpleFillSymbol_Low As New ESRI.ArcGIS.Client.Symbols.SimpleFillSymbol
  Dim aSolidColorBrush_Blue As New System.Windows.Media.SolidColorBrush(Colors.Blue)
  aSolidColorBrush_Blue.Opacity = 0.5
  aSimpleFillSymbol_Low.Fill = aSolidColorBrush_Blue
  
  ' Create a new GraphicsLayer to add to the Map Control. The individual Graphic objects will come
  ' from the returned FeatureSet.
  Dim myGraphicsLayer As New ESRI.ArcGIS.Client.GraphicsLayer
  
  ' Ensure the we have a FeatureSet with data.
  If resultFeatureSet IsNot Nothing AndAlso resultFeatureSet.Features.Count > 0 Then
    
    ' Iterate over each feature (which is a Graphic object) in the FeatureSet.
    For Each graphicFeature As ESRI.ArcGIS.Client.Graphic In resultFeatureSet.Features
      
      ' Determine which US State based upon their Attribute "POP2007" value will be assigned a specific 
      ' SimpleFillSymbol. 
      If graphicFeature.Attributes.Item("POP2007") > 15000000 Then
        graphicFeature.Symbol = TryCast(aSimpleFillSymbol_High, ESRI.ArcGIS.Client.Symbols.Symbol)
      ElseIf graphicFeature.Attributes.Item("POP2007") > 5000000 Then
        graphicFeature.Symbol = TryCast(aSimpleFillSymbol_Medium, ESRI.ArcGIS.Client.Symbols.Symbol)
      Else
        graphicFeature.Symbol = TryCast(aSimpleFillSymbol_Low, ESRI.ArcGIS.Client.Symbols.Symbol)
      End If
      
      '' Note: there are numerous graphicFeature.Attribute items that can be used for symbolization.
      '' As an experiment try uncommenting the next few lines of code to see all of the different 
      '' types of attribute information available.
      'Dim myStringBuilderDisplayText As New Text.StringBuilder
      'Dim allAttributes As System.Collections.Generic.IDictionary(Of String, Object) = graphicFeature.Attributes
      'For Each oneKey As String In allAttributes.Keys
      '  Dim theValue As Object = allAttributes.Item(oneKey)
      '  myStringBuilderDisplayText.Append(oneKey + ": " + theValue.ToString + vbCrLf)
      'Next
      'MessageBox.Show(myStringBuilderDisplayText.ToString)
      
      ' Add the Graphic to the GraphicsLayer
      myGraphicsLayer.Graphics.Add(graphicFeature)
      
    Next graphicFeature
  End If
  
  ' Add the GraphicsLayer to the Map. It will automatically draw, there is not a need for a refresh.
  Map1.Layers.Add(myGraphicsLayer)
  
End Sub