Feature layer query

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Find features in a feature table which match an SQL query.

Image of feature layer query

Use case

Query expressions can be used in ArcGIS to select a subset of features from a feature table. This is most useful in large or complicated data sets. A possible use case might be on a feature table marking the location of street furniture through a city. A user may wish to query by a TYPE column to return "benches". In this sample, we query a U.S. state by STATE_NAME from a feature table containing all U.S. states.

How to use the sample

Input the name of a U.S. state into the text field. When you click the button, a query is performed and the matching features are highlighted or an error is returned.

How it works

  1. Create a ServiceFeatureTable using the URL of a feature service.
  2. Create a QueryParameters with a where clause specified using the WhereClause property.
  3. Perform the query using QueryFeaturesAsync(query) on the service feature table.
  4. When complete, the query will return a FeatureQueryResult which can be iterated over to get the matching features.

Relevant API

  • FeatureLayer
  • FeatureQueryResult
  • QueryParameters
  • ServiceFeatureTable

About the data

This sample uses U.S. State polygon features from the USA 2016 Daytime Population feature service.

Tags

search, query

Sample Code

FeatureLayerQuery.xamlFeatureLayerQuery.xaml.cs
                     
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<UserControl
    x:Class="ArcGISRuntime.UWP.Samples.FeatureLayerQuery.FeatureLayerQuery"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:esriUI="using:Esri.ArcGISRuntime.UI.Controls">
    <Grid>
        <esriUI:MapView x:Name="MyMapView" />
        <Border Style="{StaticResource BorderStyle}">
            <StackPanel>
                <TextBlock Text="Enter a state name and press 🔎 to search."
                           TextAlignment="Center" FontWeight="SemiBold"
                           IsColorFontEnabled="False"
                           Margin="0,0,0,5" />
                <AutoSuggestBox Text="New York"
                                QueryIcon="Find"
                                HorizontalAlignment="Stretch"
                                QuerySubmitted="QueryEntry_QuerySubmitted" />
            </StackPanel>
        </Border>
    </Grid>
</UserControl>

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