How do I exclude raster layers from legend? (Silverlight, ArcGIS Server)

Question

I'm trying to adjust my Print Widget so that raster layers do not show up in the legend. My thinking was that I could test for a layer type and not add the item to the legend if it is a raster.

Something like:

Foreach (layer in List<Layers>)
    If layer is a raster:
        do nothing;
    Else: 
        Add it to the legend;

I know there's a LayerInfo thing out there but I'm not really sure how to use it. Incidentally, I'm new to C#/Silverlight/ArcGIS for Server so this simple task is a bit challenging for me. I did notice there was a GetType() method(?) that I might be able to use but I'm not sure if how if that is indeed the answer. The foreach legend item code already exists and such -- I'm looking to wrap some conditions around the legendItems.Add bit. I found the following resources, but not sure how to use them if they are helpful... http://help.arcgis.com/en/webapi/sil...o_members.html --> the "Type" property, perhaps?

Alternatively, if I'm going about this in a difficult/wrong way, feel free to point that out! I'm a new intern with no prior C#/ArcGIS Server/Silverlight experience so it's all a bit overwhelming.

Thanks in advance!

Thread on arcgis forums: http://forums.arcgis.com/threads/83788-How-do-I-retrieve-layer-type

additional thoughts: -- I'll somehow have to create a list of all the layers, too >_<.

Answer 1

The code below is taken from the Legend With Templates sample under the Toolkit Controls section. Notice how the legend item named "states" gets removed. You could do the same thing for your raster layer, but instead of checking its label, check to see if layerItemVM.Layer is ArcGISImageServiceLayer See documentation on the is operator for more explanation.

using System.Windows.Controls;
using ESRI.ArcGIS.Client.Toolkit;
using ESRI.ArcGIS.Client.Toolkit.Primitives;

namespace ArcGISSilverlightSDK
{
    public partial class LegendWithTemplates : UserControl
    {
        public LegendWithTemplates()
        {
            InitializeComponent();
        }

        private void Legend_Refreshed(object sender, Legend.RefreshedEventArgs e)
        {
            LayerItemViewModel removeLayerItemVM = null;

            if (e.LayerItem.LayerItems != null)
            {
                foreach (LayerItemViewModel layerItemVM in e.LayerItem.LayerItems)
                {
                    if (layerItemVM.IsExpanded)
                        layerItemVM.IsExpanded = false;

                    if (layerItemVM.Label == "states")
                        removeLayerItemVM = layerItemVM;
                }

                if (removeLayerItemVM != null)
                    e.LayerItem.LayerItems.Remove(removeLayerItemVM);
            }
            else
            {
                e.LayerItem.IsExpanded = false;
            }
        }
    }
}