Find features in a sublayer based on attributes and location.
Sublayers of an ArcGISMapImageLayer may expose a ServiceFeatureTable through a table property. This allows you to perform the same queries available when working with a table from a FeatureLayer: attribute query, spatial query, statistics query, query for related features, etc. An image layer with a sublayer of counties can be queried by population to only show those above a minimum population.
Specify a minimum population in the input field (values under 1810000 will produce a selection in all layers) and tap the query button to query the sublayers in the current view extent. After a short time, the results for each sublayer will appear as graphics.
- Create an
ArcGISMapImageLayerobject using the URL of an image service. - After loading the layer, get the sublayer you want to query with
(ArcGISMapImageSublayer) layer.Sublayers[index]. - Load the sublayer, and then get its
ServiceFeatureTablewithsublayer.getTable(). - Create
QueryParameters. You can setqueryParameters.WhereClauseto query against a table attribute and/or setqueryParameters.Geometryto limit the results to an area of the map. - Call
sublayerTable.QueryFeaturesAsync(queryParameters)to get aFeatureQueryResultwith features matching the query. The result is an iterable of features.
- ArcGISMapImageLayer
- ArcGISMapImageSublayer
- QueryParameters
- ServiceFeatureTable
The ArcGISMapImageLayer in the map uses the "USA" map service as its data source. This service is hosted by ArcGIS Online, and is composed of four sublayers: "states", "counties", "cities", and "highways".
Since the cities, counties, and states tables all have a POP2000 field, they can all execute a query against that attribute and a map extent.
search and query