Feature Layer - Class Break Renderer - Join To Table

JonDicken

Hi,

Is it possible to join a Feature Layer to an in memory table or graphics layer in code and use the attributes from the resulting join for thematically styling the Feature Layer using a class break renderer for example?

This would allow a user to bring their own local data in and have it used to style an existing Feature Layer using new attributes.

So the steps would be:

- Existing Feature Layer

- User selects a local database file and imports the data in to a new table or layer

- Join the new table or layer to the existing Feature Layer

- Create renderer for the Feature Layer based on attributes from the new table or layer

Regards,

AnttiKajanus1

You need to use GraphicsOverlay or GraphicsLayer and use that to contains joined data. The reason behind is that FeatureLayers uses defined Schema where GraphicsOverlay/Layer works with dynamic schema.

Steps could be something like this:

- Create source FeatureLayer with FeatureTable

- User selects geodatabase and open that in GeodatabaseFeatureTable

- Create temporary graphics overlay / layer for visualization

- Join needed data from source FeatureLayer (tip, convert features to graphics) to the dynamically created GeodatabaseFeatureTable to GraphicsCollection / List<Graphic>

- Set combined list of graphics to the temporary visualization layer

- Dynamically create renderer for the temporary visualization layer

This approach also gives you an option to delete the layer/overlay when it's not needed anymore easily.