ArcGISRuntimeXamarin.Samples.FeatureLayerQuery.FeatureLayerQuery.QueryStateFeature C# (CSharp) Méthode

        private async Task QueryStateFeature(string stateName)
        {
            // Create dialog to display alert information
            var alert = new AlertDialog.Builder(this);

            try
            {
                // Create a query parameters that will be used to Query the feature table  
                QueryParameters queryParams = new QueryParameters();

                // Construct and assign the where clause that will be used to query the feature table 
                queryParams.WhereClause = "upper(STATE_NAME) LIKE '%" + (stateName.ToUpper()) + "%'";

                // Query the feature table 
                FeatureQueryResult queryResult = await _featureTable.QueryFeaturesAsync(queryParams);

                // Cast the QueryResult to a List so the results can be interrogated
                var features = queryResult.ToList();

                if (features.Any())
                {
                    // Get the first feature returned in the Query result 
                    Feature feature = features[0];

                    // Add the returned feature to the collection of currently selected features
                    _featureLayer.SelectFeature(feature);

                    // Zoom to the extent of the newly selected feature
                    await _myMapView.SetViewpointGeometryAsync(feature.Geometry.Extent);
                }
                else
                {
                    alert.SetTitle("State Not Found!");
                    alert.SetMessage("Add a valid state name.");
                    alert.Show();
                }
            }
            catch (Exception ex)
            {
                alert.SetTitle("Sample Error");
                alert.SetMessage(ex.Message);
                alert.Show();
            }                   
        }