topic Re: Xamarin: Feature Layer not returning custom Attributes in .NET Maps SDK Questions

Xamarin: Feature Layer not returning custom Attributes

brianbullas — Sat, 11 Dec 2021 22:23:44 GMT

I am trying to Query a Feature Layer, but only the core ESRI attributes are being returned. How do i get all of the attributes? If i look at the Fields property of the feature layer (_featureLayer below) i am querying, it does list all the custom fields available, but they just aren't returning when i do a query. There isn't a "OutFields" property in the QueryParameters object that I can see...

Query code below.

var query = new QueryParameters
{
   Geometry = TreeMapView.VisibleArea,
   SpatialRelationship = SpatialRelationship.Contains,
   ReturnGeometry = true,
};

_featureLayer.ClearSelection();

var queryResult = await _featureTable.QueryFeaturesAsync(query);
var features = queryResult.ToList();
foreach (var item in features)
{
   //*** EACH item has only 7 attributes, and they are only the ESRI core ones
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Xamarin: Feature Layer not returning custom Attributes

JenniferNery — Tue, 25 Apr 2017 22:10:03 GMT

By custom attributes, do you mean the service does not define these fields?

Are you working with ServiceFeatureTable? If yes, there is a LoadAll that will return all fields defined by service, the other QueryFeatures method will return minimum set of attributes (i.e. objectIdField, typeIdField, fields used for rendering, etc.) https://developers.arcgis.com/net/latest/wpf/api-reference//html/T_Esri_ArcGISRuntime_Data_QueryFeatureFields.htm

Re: Xamarin: Feature Layer not returning custom Attributes

brianbullas — Tue, 25 Apr 2017 22:17:03 GMT

Aye, that's it thanks.

Yes, working with a ServiceFeatureTable. All 50 attributes now returning. Not sure how i missed that overload.

Cheers!

var queryResult = await _featureTable.QueryFeaturesAsync(query,QueryFeatureFields.LoadAll);‍

Re: Xamarin: Feature Layer not returning custom Attributes

DavidHaines — Fri, 08 Dec 2017 22:45:59 GMT

It would be helpful to include this option in the samples, as I think most people would expect LoadAll to be the default.

Re: Xamarin: Feature Layer not returning custom Attributes

DavidPeña1 — Fri, 18 May 2018 12:12:06 GMT

Hello,

Is there any similar method if I am working with FeatureLayer from mmpk?

Thanks

Re: Xamarin: Feature Layer not returning custom Attributes

AnttiKajanus1 — Mon, 21 May 2018 10:06:26 GMT

You should get all the properties directly since you are working with GeodatabaseFeatureTable. You can make sure that the features you use are loaded though.

Re: Xamarin: Feature Layer not returning custom Attributes

JenniferNery — Mon, 21 May 2018 16:49:27 GMT

While the overload with `QueryFeatureFields` is only on `ServiceFeatureTable`. As Antti noted, features must be loaded. `LoadAsync` on `ArcGISFeature` will do this as well, load all of feature attributes. This is available on features belonging to an `ArcGISFeatureTable` (i.e. ServiceFeatureTable, GeodatabaseFeatureTable).