topic Re: Get Layer type in DynamicMapService in ArcGIS API for Silverlight Questions

Get Layer type in DynamicMapService

deleted-user-ATjHIWsdQYmT — Sun, 18 Sep 2011 20:50:06 GMT

Is there a way to determine the type of layer(s) in a map service? When looping through all the layers in my map service I would like to know what kind of layers they are. I thought maybe there would be a property in the LayerInfo class but there is not. Any Ideas?

Re: Get Layer type in DynamicMapService

DominiqueBroux — Mon, 19 Sep 2011 06:56:59 GMT

You can query the 'layers' resource of the map service and deserialize the response by yourself:
- documentation : http://help.arcgis.com/en/arcgisserv...st/layers.html
- sample : http://services.arcgisonline.com/Arc...layers?f=pjson

The type field is giving you the type of layer (Feature Layer, Raster, Group Layer, ....)

Re: Get Layer type in DynamicMapService

deleted-user-ATjHIWsdQYmT — Sat, 11 Dec 2021 13:28:17 GMT

Do you think you could help me along a little more. What I am looking to do is loop through all the layers in my Dynamic Map Service and build a list of layers that are visible. If the Layer is visible and is an annotation sublayer I don't want to add it to my list (since anno sublayers should always be checked/visible). I'm not 100% sure how to query json but that sounds like what I need to do.
Here is my code as it stands now.

 Public Function VisibleLayerList(ByVal MapService As ArcGISDynamicMapServiceLayer) As String
            Dim LayList As String
            For Each ly As LayerInfo In MapService.Layers
                If MapService.GetLayerVisibility(ly.ID) = True Then
                    LayList += (ly.ID) & ","
                End If
            Next
            If LayList.EndsWith(",") Then
                LayList = LayList.Substring(0, LayList.Length - 1)
            End If
            Return LayList
        End Function

Re: Get Layer type in DynamicMapService

GarimaVyas — Tue, 20 Sep 2011 12:48:15 GMT

If you just want to check whether a layer is visible or not, you could work with ArcGISDynamicMapServiceLayer's VisibleLayers property. This returns an integer array, cast it to IList and use Contains() method to figure out if a specific layer is visible.

Re: Get Layer type in DynamicMapService

deleted-user-ATjHIWsdQYmT — Wed, 21 Sep 2011 14:06:36 GMT

If you just want to check whether a layer is visible or not, you could work with ArcGISDynamicMapServiceLayer's VisibleLayers property. This returns an integer array, cast it to IList and use Contains() method to figure out if a specific layer is visible.

Well, that is what I am doing now, but what I want to know is that if the layer is visible, what kind of layer it is i.e. Annotation Layer, Feature Layer, Group Layer, etc.

It looks like layerinfo tells if it's visible or not, but doesn't tell what kind of layer it is. It'd be nice to get layer type from layerinfo. Any more pointers?

Re: Get Layer type in DynamicMapService

DominiqueBroux — Sat, 11 Dec 2021 13:28:20 GMT

To get the layer type by quering the 'layers' REST resource.

1) Get the JsonReader util class I attached
2) Define the datacontracts corresponding to the 'layers' end point:

 
namespace DataContracts
{
  [DataContract]
  public class LayersData
  {
    [DataMember(Name = "layers")]
    public IEnumerable<LayerData> Layers { get; set; }
  }
 
  [DataContract]
  public class LayerData // Only data for the sample -> to complete if needed
  {
    [DataMember(Name = "id")]
    public int Id { get; set; }
    [DataMember(Name = "type")]
    public String Type { get; set; }
    [DataMember(Name = "defaultVisibility")]
    public bool DefaultVisibility { get; set; }
  }
}

3) Get asynchronously the layer infos with code like:

 
void GetLayersAsync()
{
  var json = new JsonReader<LayersData>();
  json.OnCompleted += json_OnCompleted;
  json.GetData("http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/layers?f=json");
}
void json_OnCompleted(object sender, CompletedEventsArg<LayersData> e)
{
  var layers = e.Result.Layers;
  if (layers != null)
 {
    // For sample : create an array with visible layers of type "Feature Layer"
    int[] visibleFeatureLayers = layers.Where(layer => layer.DefaultVisibility && layer.Type == "Feature Layer").Select(layer => layer.Id).ToArray();
    .........
  }
}