topic Re: How to get parent from SubtypeSublayer in .NET Maps SDK Questions

How to get parent from SubtypeSublayer

EricLiu — Thu, 11 Sep 2025 17:26:29 GMT

Hi, since SubtypeSublayer cannot be queried, Esri suggested querying the parent SubtypeFeatureLayer in answer . Is there a way to get the SubtypeSublayer's parent SubtypeFeatureLayer from the SubtypeSublayer ? SubtypeSublayers in the JavaScript SDK has a parent property doc . But I couldn't find a similar property in the .NET Maps SDK.

Thanks.

Re: How to get parent from SubtypeSublayer

JenniferNery — Thu, 11 Sep 2025 18:22:44 GMT

The query operations are on the FeatureLayer.featureTable property. ArcGISFeatureTable, you can use the Sublayer's subtype code as additional filter in your where clause or use SubtypeSubtable.

Whether you're getting SubtypeFeatureLayer from web map or table that supports subtype, you can try the following code. Notice that for "Service Station" subtype (code: 21) on a Pipeline Device there's only 1 feature of this subtype out of 31411 features.

Hm, there is no back-reference to the parent layer from SubtypeSublayer though. Can you describe your workflow, how you have access to the sublayer only but not have access to the layer?

Re: How to get parent from SubtypeSublayer

EricLiu — Thu, 11 Sep 2025 18:25:12 GMT

Thank you for the quick response @JenniferNery !

In your snippet I see the code has a reference to both the SubtypeSublayer and the SubtypeFeatureLayer. If I only have a reference to the SubtypeSublayer, is it not possible to obtain the SubtypeFeatureLayer it belongs to via a 'parent' property ?

Also comparing to the web SDK. I notice in web, SubtypeSublayer's Id field is a unique string, and a number like '2' as the subtype code. But in the .NET SDK, the Id property is just the subtype code '2'.

I'm trying to either access the SubtypeFeatureLayer through the SubtypeSublayer, or for the SubtypeSublayer to have an unique enough Id for the to search for in the Map.

Re: How to get parent from SubtypeSublayer

JenniferNery — Thu, 11 Sep 2025 20:30:55 GMT

There is currently no way from SubtypeSublayer to get to its parent layer. But if you have a feature from an identify or query, this feature has reference to the table, and the table has reference to the layer it comes from.

As for the SubtypeSublayer.Id, in the Native SDKs this is meant to match the Subtype.code property. If you are using search.layer | Web Map Specification | Esri Developer, I think there's an optional subLayer property that will match SubtypeSublayer.Id.

The "id" on this search is a string so it will not match the sublayer. There is however, a SubtypeSublayer.unsupportedJSON property that is deprecated and will be removed in the next release that contains the "id" string. JSON on the left can be web/mobile map, watch window on the right is from map loaded in Native SDK for .NET.