I'm having some trouble with ServiceFeatureTable.QueryFeaturesAsync().
Basically, it seems to produce very inconsistent results on iOS. Sometimes it returns features, but mostly it doesn't. I've tried on a few different services and layers and get the same behavior.
My code looks like this:
var queryParams = new QueryParameters()
ReturnGeometry = true,
SpatialRelationship = SpatialRelationship.EnvelopeIntersects,
Geometry = // a polygon obtained from user in spatial ref wkid 3857 (web mercator)
var features = await featureTable.QueryFeaturesAsync(queryParams, Esri.ArcGISRuntime.Data.QueryFeatureFields.Minimum, options.CancellationToken);
The service is also in 3857.
The problem is that no features are returned even though there clearly are features at the given location.
I looked at the request using the Charles web proxy (similar to Fiddler, but works on a Mac), and ArcGIS Server is responding with http 304 (not modified). If I repeat the request with caching disabled in Charles, then ArcGIS Server does return results to me.
It seems like a bug to me. Is this a known issue? Are there any workarounds or solutions?
It works fine on Android and Windows UWP.