Problem consuming Annotation Layer: "invalid response"

[PhilScovis]

I'm trying to learn how to consume an "Annotation Layer" from the UWP Runtime.  My first thought was to use the AnnotationLayer object in the same way that I had used "FeatureLayer" before.  

Uri uri = new Uri(_AnnotationUri.ToString() + "/" + _AnnotationLayerId.ToString());
_AnnotationLayer = new AnnotationLayer(uri);
_AnnotationLayer.IsVisible = true;
_MapView.Map.OperationalLayers.Add(_AnnotationLayer);

await _AnnotationLayer.LoadAsync();

However, this gives an error "invalid response" on the last line, with no further information.  Am I doing this correctly?

I watched the traffic in Fiddler, and it seems that it is dropping off the layer id in the request uri.  The response looks like a description of all the layers on the service, not just the one I was after.  This would account for the "invalid response".  But what is the correct way to load and display an Annotation Layer then?  

Thanks for any help.

[MichaelBranscomb]

Hi,

Can you share an example of the URI string you're providing?

Cheers

Mike

[PhilScovis]

Sure.  This is not public, but you can see what it looks like:

https://usalvwdgis1.infor.com:6443/arcgis/rest/services/WALTERS/Sacramento_AnnoTest/MapServer 

My code is adding on a /0 to the end. 

https://usalvwdgis1.infor.com:6443/arcgis/rest/services/WALTERS/Sacramento_AnnoTest/MapServer/0 

But as I said, the layer id is being stripped off in the actual request.

The response to the runtime looks like this:

{"currentVersion":10.51,"serviceDescription":"","mapName":"Layers","description":"","copyrightText":"","supportsDynamicLayers":true,"layers":[{"id":0,"name":"ParcelsAnno2","parentLayerId":-1,"defaultVisibility":true,"subLayerIds":[1,2,3],"minScale":20000,"maxScale":0}, ... and so on.

which, of course, is not going to the specific layer I wanted.

Going through a browser, and including the layer id, I would get this:

{"currentVersion":10.51,"id":0,"name":"ParcelsAnno2","type":"Annotation Layer","description":"","geometryType":"esriGeometryPolygon","sourceSpatialReference":{"wkid":102642,"latestWkid":2226},"copyrightText":"","parentLayer":null,"subLayers":[{"id":1,"name":"Default"},{"id":2,"name":"GT37065"}, ...

So the problem seems to be in how I am initializing or using the AnnotationLayer object.

[MichaelBranscomb]

Hi,

Annotation is currently only supported from the `.../FeatureServer/... endpoint so your code just needs to be updated to:

`https://usalvwdgis1.infor.com:6443/arcgis/rest/services/WALTERS/Sacramento_AnnoTest/FeatureServer/0`

Cheers

Mike