QueryRelatedFeaturesAsync returns zero results

MattH — Fri, 18 Mar 2022 16:34:58 GMT

I've been trying to call QueryRelatedFeaturesAsync to get related features from a feature service, but it's returning zero results. If I call queryRelatedRecords using Rest with the same ObjectID, I correctly get 38 results.

I was actually getting related features returned at some point last week, but it looks like I'm missing something now.

I've tried a few things:

IdentifyLayerResult results = await esriMap.IdentifyLayerAsync(_myFeatureLayer, e.Position, 10, false); //correct feature is loaded ArcGISFeature myFeature; = (ArcGISFeature)results.GeoElements[0]; //returns zero results IReadOnlyList<RelatedFeatureQueryResult> relatedFeaturesResult = await myFeatureTable.QueryRelatedFeaturesAsync(myFeature);

I tried adding query parameters:

ArcGISFeatureTable myFeatureTable = ArcGISFeatureTable)myFeature.FeatureTable; //returns the correct relationship info RelationshipInfo commentsRelationshipInfo = myFeatureTable.LayerInfo.RelationshipInfos.FirstOrDefault(); RelatedQueryParameters relatedQueryParams = new RelatedQueryParameters(commentsRelationshipInfo) { ReturnGeometry = true }; //returns zero results IReadOnlyList<RelatedFeatureQueryResult> relatedFeaturesResult = await myFeatureTable.QueryRelatedFeaturesAsync(myFeature, relatedQueryParams);

I also tried force loading the feature table:

await myFeature.LoadAsync(); await myFeature.FeatureTable.LoadAsync(); ArcGISFeatureTable myFeatureTable = ArcGISFeatureTable)myFeature.FeatureTable; //returns the correct relationship info RelationshipInfo commentsRelationshipInfo = myFeatureTable.LayerInfo.RelationshipInfos.FirstOrDefault(); RelatedQueryParameters relatedQueryParams = new RelatedQueryParameters(commentsRelationshipInfo) { ReturnGeometry = true }; //returns zero results IReadOnlyList<RelatedFeatureQueryResult> relatedFeaturesResult = await myFeatureTable.QueryRelatedFeaturesAsync(myFeature, relatedQueryParams);

Re: QueryRelatedFeaturesAsync returns zero results

JoeHershman — Fri, 18 Mar 2022 19:29:12 GMT

I've only ever done with offline tables, but you could try to explicitly load the related tables and see if that helps

var relatedTables = myFeatureTable .GetRelatedTables(); foreach (var relatedTable in relatedTables) { await relatedTable.LoadAsync(); } var relatedFeaturesResult = await myFeatureTable.QueryRelatedFeaturesAsync(myFeature);

Re: QueryRelatedFeaturesAsync returns zero results

MattH — Mon, 21 Mar 2022 15:17:32 GMT

Thank you.

That didn't work directly, but it got me to look in the right place.

At some point, I removed my reference to the related feature layer from the map. I didn't realize that the feature table had to be explicitly added to the map to be found by .QueryRelatedFeaturesAsync()

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QueryRelatedFeaturesAsync returns zero results

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