private async void MyMapView_GeoViewTapped(object sender, GeoViewInputEventArgs e)
{
// Clear any existing feature selection and results list.
_myFeatureLayer.ClearSelection();
_tableView.Source = null;
_tableView.ReloadData();
try
{
// Identify the tapped feature.
IdentifyLayerResult results = await _myMapView.IdentifyLayerAsync(_myFeatureLayer, e.Position, 10, false);
// Return if there are no results.
if (results.GeoElements.Count < 1)
{
return;
}
// Get the first result.
ArcGISFeature myFeature = (ArcGISFeature)results.GeoElements.First();
// Select the feature.
_myFeatureLayer.SelectFeature(myFeature);
// Get the feature table for the feature.
ArcGISFeatureTable myFeatureTable = (ArcGISFeatureTable)myFeature.FeatureTable;
// Query related features.
IReadOnlyList <RelatedFeatureQueryResult> relatedFeaturesResult = await myFeatureTable.QueryRelatedFeaturesAsync(myFeature);
// Create a list to hold the formatted results of the query.
List <string> queryResultsForUi = new List <string>();
// For each query result.
foreach (RelatedFeatureQueryResult result in relatedFeaturesResult)
{
// And then for each feature in the result.
foreach (Feature resultFeature in result)
{
// Get a reference to the feature's table.
ArcGISFeatureTable relatedTable = (ArcGISFeatureTable)resultFeature.FeatureTable;
// Get the display field name - this is the name of the field that is intended for display.
string displayFieldName = relatedTable.LayerInfo.DisplayFieldName;
// Get the name of the feature's table.
string tableName = relatedTable.TableName;
// Get the display name for the feature.
string featureDisplayName = resultFeature.Attributes[displayFieldName].ToString();
// Create a formatted result string.
string formattedResult = $"{tableName} - {featureDisplayName}";
// Add the result to the list.
queryResultsForUi.Add(formattedResult);
}
}
// Create the source for the display list.
_layerListSource = new LayerListSource(queryResultsForUi);
// Assign the source to the display view.
_tableView.Source = _layerListSource;
// Force the table view to refresh its data.
_tableView.ReloadData();
}
catch (Exception ex)
{
new UIAlertView("Error", ex.ToString(), (IUIAlertViewDelegate)null, "OK", null).Show();
}
}
private async void MyMapViewOnGeoViewTapped(object sender, GeoViewInputEventArgs e)
{
// Clear any existing feature selection and results list
_myFeatureLayer.ClearSelection();
_myDisplayList.Source = null;
_myDisplayList.ReloadData();
// Identify the tapped feature
IdentifyLayerResult results = await _myMapView.IdentifyLayerAsync(_myFeatureLayer, e.Position, 10, false);
// Return if there are no results
if (results.GeoElements.Count < 1)
{
return;
}
// Get the first result
ArcGISFeature myFeature = (ArcGISFeature)results.GeoElements.First();
// Select the feature
_myFeatureLayer.SelectFeature(myFeature);
// Get the feature table for the feature
ArcGISFeatureTable myFeatureTable = (ArcGISFeatureTable)myFeature.FeatureTable;
// Query related features
IReadOnlyList <RelatedFeatureQueryResult> relatedFeaturesResult = await myFeatureTable.QueryRelatedFeaturesAsync(myFeature);
// Create a list to hold the formatted results of the query
List <String> queryResultsForUi = new List <string>();
// For each query result
foreach (RelatedFeatureQueryResult result in relatedFeaturesResult)
{
// And then for each feature in the result
foreach (Feature resultFeature in result)
{
// Get a reference to the feature's table
ArcGISFeatureTable relatedTable = (ArcGISFeatureTable)resultFeature.FeatureTable;
// Get the display field name - this is the name of the field that is intended for display
string displayFieldName = relatedTable.LayerInfo.DisplayFieldName;
// Get the name of the feature's table
string tableName = relatedTable.TableName;
// Get the display name for the feature
string featureDisplayname = resultFeature.Attributes[displayFieldName].ToString();
// Create a formatted result string
string formattedResult = String.Format("{0} - {1}", tableName, featureDisplayname);
// Add the result to the list
queryResultsForUi.Add(formattedResult);
}
}
// Create the source for the display list
_layerListSource = new LayerListSource(queryResultsForUi);
// Assign the source to the display view
_myDisplayList.Source = _layerListSource;
// Force the table view to refresh its data
_myDisplayList.ReloadData();
}
