private async Task GenerateRenderer(GenerateRendererParameters rendererParam)
{
GenerateRendererResult result = await generateRendererTask.GenerateRendererAsync(rendererParam);
LayerDrawingOptions layerDrawingOptions = null;
LayerDrawingOptionCollection options = null;
// If this is the first execution of this sample create a new LayerDrawingOptionsCollection
if (((ArcGISDynamicMapServiceLayer)map.Layers["USA"]).LayerDrawingOptions == null)
{
options = new LayerDrawingOptionCollection();
// Add a new LayerDrawingOptions for layer ID 2 using the generated renderer
options.Add(new LayerDrawingOptions()
{
LayerID = 2, Renderer = result.Renderer
});
}
else
{
// Otherwise the layer will have an existing LayerDrawingOptionsCollection from a previous button click
options = ((ArcGISDynamicMapServiceLayer)map.Layers["USA"]).LayerDrawingOptions;
// Iterate over the LayerDrawingOptionsCollection.
// For layer ID 2 get the existing LayerDrawingOptions object and apply the newly generated renderer
foreach (LayerDrawingOptions drawOption in options)
{
if (drawOption.LayerID == 2)
{
layerDrawingOptions = drawOption;
drawOption.Renderer = result.Renderer;
}
}
}
// Retrieve the GenerateRendererParameters Where clause and create a new LayerDefinition for layer ID 2
if (!string.IsNullOrEmpty(rendererParam.Where))
{
LayerDefinition layerDefinition = new LayerDefinition()
{
LayerID = 2,
Definition = rendererParam.Where
};
((ArcGISDynamicMapServiceLayer)map.Layers["USA"]).LayerDefinitions =
new ObservableCollection <LayerDefinition>()
{
layerDefinition
};
}
// Apply the updated LayerDrawingOptionsCollection to the LayerDrawingOptions property on the layer
((ArcGISDynamicMapServiceLayer)map.Layers["USA"]).LayerDrawingOptions = options;
}
void generateRendererTask_ExecuteCompleted(object sender, GenerateRendererResultEventArgs e)
{
GenerateRendererResult rendererResult = e.GenerateRendererResult;
LayerDrawingOptionsCollection options = (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).LayerDrawingOptions != null
? (MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).LayerDrawingOptions : new LayerDrawingOptionsCollection();
LayerDrawingOptions layerDrawingOptionsParcels = null;
foreach (LayerDrawingOptions drawOption in options)
{
if (drawOption.LayerID == 2)
{
layerDrawingOptionsParcels = drawOption;
drawOption.Renderer = rendererResult.Renderer;
}
}
if (e.UserState != null)
{
LayerDefinition layerDefinition = new LayerDefinition()
{
LayerID = 2,
Definition = e.UserState as string
};
(MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).LayerDefinitions =
new System.Collections.ObjectModel.ObservableCollection <LayerDefinition>()
{
layerDefinition
};
}
else
{
(MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).LayerDefinitions = null;
}
if (layerDrawingOptionsParcels == null)
{
options.Add(new LayerDrawingOptions()
{
LayerID = 2, Renderer = rendererResult.Renderer
});
}
(MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).LayerDrawingOptions = options;
(MyMap.Layers["USA"] as ArcGISDynamicMapServiceLayer).Refresh();
}
