topic Re: Adding a feature layer via Geodatabase in ArcGIS Pro SDK Questions

Adding a feature layer via Geodatabase

MarkGumban — Sun, 12 Dec 2021 10:01:47 GMT

I'm using the following code to open a connection to a feature server and adding a feature layer to the current map:

var serviceUrl = @"http://url-of-feature-server/FeatureServer";
var layerId = "0";
var map = MapView.Active.Map;

using (var geoDb = new Geodatabase(new ServiceConnectionProperties(new Uri(serviceUrl)))
{
  var defNames = geoDb.GetDefinitions<FeatureClassDefinition>()
    .Select(def => def.GetName()).ToArray();
  var id = int.Parse(layerId);
  Debug.Assert(defNames.Length > id);
  if (defNames.Length > id)
  {
    using (var featureClass = geoDb.OpenDataset<FeatureClass>(defNames[id]))
    {
      featureLayer = LayerFactory.Instance.CreateFeatureLayer(featureClass, map);
      featureLayer.SetDisplayCacheType(DisplayCacheType.None);
      featureLayer.SetDisplayCacheMaxAge(TimeSpan.Zero);
    }
  }
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

This works fine the 1st time this code gets executed. If the feature server has N feature layers then defNames gets N definitions.

If the feature server gains a new layer, one would expect that the next time this code gets executed defNames would have N + 1 items. However it still returns N definitions. Using Fiddler, I can see that ArcGIS performs HTTP requests (to get feature definitions, metadata, etc.) the 1st time the Geodatabase object is created. Subsequent creations of new Geodatabase objects (using the same service URL) does not make any other HTTP requests, even when geoDb object was disposed via "using", as if it was being cached by ArcGIS.

I would like to ensure that every time I create a new Geodatabase object that it has the most recent feature definitions and ArcGIS doesn't cache anything. How would one do that?

Additionally, I've noticed that SetDisplayCacheType(DisplayCacheType.None) does not seem to apply or update the layer's properties (checking via Layer->Properties->Cache).

Re: Adding a feature layer via Geodatabase

CharlesMacleod — Wed, 16 May 2018 16:40:47 GMT

Thanks Mark. We've added this as an issue for our next release after 2.2.

Re: Adding a feature layer via Geodatabase

JamesKerr — Thu, 17 May 2018 01:38:40 GMT

Thanks Charles. Do you have any recommendations for work arounds in the meantime? Is there any way to force Pro to refresh the available layers in a service? Are there any flags that we could set in the service/layer metadata?

Re: Adding a feature layer via Geodatabase

CharlesMacleod — Thu, 17 May 2018 17:09:32 GMT

Hi James, unfortunately, there is no workaround.

Re: Adding a feature layer via Geodatabase

JamesKerr — Tue, 16 Oct 2018 10:01:13 GMT

Hey Charles. I'm just checking up on this to see if you have any update on a fix for this.

Thanks,

-James

Re: Adding a feature layer via Geodatabase

RichRuh — Tue, 16 Oct 2018 15:43:19 GMT

James,

This will be fixed in Pro 2.3, expected early 2019.

--Rich

Re: Adding a feature layer via Geodatabase

JamesKerr — Tue, 16 Oct 2018 15:46:10 GMT

Thanks Rich.

Re: Adding a feature layer via Geodatabase

JeffRogholt — Mon, 13 Sep 2021 16:02:54 GMT

When the cache type is set in code, is the Cache property tab supposed to update? When I set cache type to None (or any other value), the UI has "Clear cache when the session ends" selected. Also, ArcGIS Pro doesn't seem to use the value set via code, instead it's using the value seen in the UI.

ArcGIS Pro 2.7.3 is being used.

featureLayer.SetDisplayCacheType(ArcGIS.Core.CIM.DisplayCacheType.None);