public static async Task <IDictionary <Layer, IEnumerable <IdentifyFeature> > > Identify(MapViewController controller, Point tapPoint, MapPoint mapPoint, IEnumerable <Layer> layers = null, double toleranceInPixels = 5)
{
if (controller == null)
{
throw new ArgumentNullException("controller");
}
if (layers == null)
{
throw new ArgumentNullException("layers");
}
var identifyLayers = LayerCollection.EnumerateLeaves(layers);
var results = await Task.WhenAll((from l in identifyLayers where l.IsVisible select IdentifyLayer(controller, l, tapPoint, mapPoint)).Where((l => l != null)).ToArray()).ConfigureAwait(false);
IDictionary <Layer, IEnumerable <IdentifyFeature> > taskResults = null;
foreach (var result in results)
{
if (taskResults == null)
{
taskResults = new Dictionary <Layer, IEnumerable <IdentifyFeature> >();
}
if (!taskResults.ContainsKey(result.Key))
{
taskResults.Add(result);
}
}
return(taskResults);
}