// Handle a new selected comment record in the table view.
private async void CommentsTableSource_ServiceRequestCommentSelected(object sender, ServiceRequestCommentSelectedEventArgs e)
{
// Clear selected features from the graphics overlay.
_selectedFeaturesOverlay.Graphics.Clear();
// Get the map image layer that contains the service request sublayer and the service request comments table.
ArcGISMapImageLayer serviceRequestsMapImageLayer = (ArcGISMapImageLayer)_myMapView.Map.OperationalLayers[0];
// Get the (non-spatial) table that contains the service request comments.
ServiceFeatureTable commentsTable = serviceRequestsMapImageLayer.Tables[0];
// Get the relationship that defines related service request features for features in the comments table (this is the first and only relationship).
RelationshipInfo commentsRelationshipInfo = commentsTable.LayerInfo.RelationshipInfos.FirstOrDefault();
// Create query parameters to get the related service request for features in the comments table.
RelatedQueryParameters relatedQueryParams = new RelatedQueryParameters(commentsRelationshipInfo)
{
ReturnGeometry = true
};
try
{
// Query the comments table to get the related service request feature for the selected comment.
IReadOnlyList <RelatedFeatureQueryResult> relatedRequestsResult = await commentsTable.QueryRelatedFeaturesAsync(e.SelectedComment, relatedQueryParams);
// Get the first result.
RelatedFeatureQueryResult result = relatedRequestsResult.FirstOrDefault();
// Get the first feature from the result. If it's null, warn the user and return.
ArcGISFeature serviceRequestFeature = result.FirstOrDefault() as ArcGISFeature;
if (serviceRequestFeature == null)
{
UIAlertController alert = UIAlertController.Create("No Feature", "Related feature not found.", UIAlertControllerStyle.Alert);
alert.AddAction(UIAlertAction.Create("OK", UIAlertActionStyle.Default, null));
PresentViewController(alert, true, null);
return;
}
// Load the related service request feature (so its geometry is available).
await serviceRequestFeature.LoadAsync();
// Get the service request geometry (point).
MapPoint serviceRequestPoint = serviceRequestFeature.Geometry as MapPoint;
// Create a cyan marker symbol to display the related feature.
Symbol selectedRequestSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, Color.Cyan, 14);
// Create a graphic using the service request point and marker symbol.
Graphic requestGraphic = new Graphic(serviceRequestPoint, selectedRequestSymbol);
// Add the graphic to the graphics overlay and zoom the map view to its extent.
_selectedFeaturesOverlay.Graphics.Add(requestGraphic);
await _myMapView.SetViewpointCenterAsync(serviceRequestPoint, 150000);
}
catch (Exception ex)
{
new UIAlertView("Error", ex.ToString(), (IUIAlertViewDelegate)null, "OK", null).Show();
}
}
// Handle a new selected comment record in the table view.
private async void CommentsListBox_SelectionChanged(object sender, System.Windows.Controls.SelectionChangedEventArgs e)
{
// Clear selected features from the graphics overlay.
_selectedFeaturesOverlay.Graphics.Clear();
// Get the selected comment feature. If there is no selection, return.
ArcGISFeature selectedComment = e.AddedItems[0] as ArcGISFeature;
if (selectedComment == null)
{
return;
}
// Get the map image layer that contains the service request sublayer and the service request comments table.
ArcGISMapImageLayer serviceRequestsMapImageLayer = MyMapView.Map.OperationalLayers[0] as ArcGISMapImageLayer;
// Get the (non-spatial) table that contains the service request comments.
ServiceFeatureTable commentsTable = serviceRequestsMapImageLayer.Tables[0];
// Get the relationship that defines related service request features for features in the comments table (this is the first and only relationship).
RelationshipInfo commentsRelationshipInfo = commentsTable.LayerInfo.RelationshipInfos.FirstOrDefault();
// Create query parameters to get the related service request for features in the comments table.
RelatedQueryParameters relatedQueryParams = new RelatedQueryParameters(commentsRelationshipInfo)
{
ReturnGeometry = true
};
// Query the comments table to get the related service request feature for the selected comment.
IReadOnlyList <RelatedFeatureQueryResult> relatedRequestsResult = await commentsTable.QueryRelatedFeaturesAsync(selectedComment, relatedQueryParams);
// Get the first result.
RelatedFeatureQueryResult result = relatedRequestsResult.FirstOrDefault();
// Get the first feature from the result. If it's null, warn the user and return.
ArcGISFeature serviceRequestFeature = result.FirstOrDefault() as ArcGISFeature;
if (serviceRequestFeature == null)
{
MessageBox.Show("Related feature not found.", "No Feature");
return;
}
// Load the related service request feature (so its geometry is available).
await serviceRequestFeature.LoadAsync();
// Get the service request geometry (point).
MapPoint serviceRequestPoint = serviceRequestFeature.Geometry as MapPoint;
// Create a cyan marker symbol to display the related feature.
Symbol selectedRequestSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, System.Drawing.Color.Cyan, 14);
// Create a graphic using the service request point and marker symbol.
Graphic requestGraphic = new Graphic(serviceRequestPoint, selectedRequestSymbol);
// Add the graphic to the graphics overlay and zoom the map view to its extent.
_selectedFeaturesOverlay.Graphics.Add(requestGraphic);
await MyMapView.SetViewpointCenterAsync(serviceRequestPoint, 150000);
}
// When a comment is clicked, get the related feature (service request) and select it on the map.
private async void CommentsListBox_ItemClick(object sender, AdapterView.ItemClickEventArgs e)
{
// Clear selected features from the graphics overlay.
_selectedFeaturesOverlay.Graphics.Clear();
// Get the clicked record (ArcGISFeature) using the list position. If one is not found, return.
ArcGISFeature selectedComment = _commentFeatures[e.Position] as ArcGISFeature;
if (selectedComment == null)
{
return;
}
// Get the map image layer that contains the service request sublayer and the service request comments table.
ArcGISMapImageLayer serviceRequestsMapImageLayer = _myMapView.Map.OperationalLayers[0] as ArcGISMapImageLayer;
// Get the (non-spatial) table that contains the service request comments.
ServiceFeatureTable commentsTable = serviceRequestsMapImageLayer.Tables[0];
// Get the relationship that defines related service request features to features in the comments table (this is the first and only relationship).
RelationshipInfo commentsRelationshipInfo = commentsTable.LayerInfo.RelationshipInfos.FirstOrDefault();
// Create query parameters to get the related service request for features in the comments table.
RelatedQueryParameters relatedQueryParams = new RelatedQueryParameters(commentsRelationshipInfo)
{
ReturnGeometry = true
};
// Query the comments table to get the related service request feature for the selected comment.
IReadOnlyList <RelatedFeatureQueryResult> relatedRequestsResult = await commentsTable.QueryRelatedFeaturesAsync(selectedComment, relatedQueryParams);
// Get the first result.
RelatedFeatureQueryResult result = relatedRequestsResult.FirstOrDefault();
// Get the first feature from the result. If it's null, warn the user and return.
ArcGISFeature serviceRequestFeature = result.FirstOrDefault() as ArcGISFeature;
if (serviceRequestFeature == null)
{
// Report to the user that a related feature was not found, then return.
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this);
AlertDialog alert = alertBuilder.Create();
alert.SetMessage("Related feature not found.");
alert.Show();
return;
}
// Load the related service request feature (so its geometry is available).
await serviceRequestFeature.LoadAsync();
// Get the service request geometry (point).
MapPoint serviceRequestPoint = serviceRequestFeature.Geometry as MapPoint;
// Create a cyan marker symbol to display the related feature.
Symbol selectedRequestSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, System.Drawing.Color.Cyan, 14);
// Create a graphic using the service request point and marker symbol.
Graphic requestGraphic = new Graphic(serviceRequestPoint, selectedRequestSymbol);
// Add the graphic to the graphics overlay and zoom the map view to its extent.
_selectedFeaturesOverlay.Graphics.Add(requestGraphic);
await _myMapView.SetViewpointCenterAsync(serviceRequestPoint, 150000);
}