Get the list of layers (in ArcGISDynamicMapServiceLayer) in the listbox at runtime.

SanjayRajput — Sun, 12 Dec 2021 16:09:52 GMT

I am trying to build a listbox of layers in the ArcGISDynamicMapServiceLayer. This listbox will be loaded initially with list of layers having checkbox beside it (to show and set the layer visibility). Is that possible first of all? Basically I building my own TOC. Below is the code snippet but on startup its throwing unknown exeception on this line : LayerVisibilityListBox.ItemsSource = visibleLayerList;

       <!-- Map-->
        <esri:Map x:Name="MyMap" Grid.Row="0" Grid.Column="1" >
            <esri:ArcGISDynamicMapServiceLayer ID="MyLayer" Initialized="DynamicLayer_Initialized" 
                Url="http://srajput/arcgis/rest/services/LCEC20/MapServer" />
        </esri:Map>

        <!-- Toggling Layer visibilty-->
        <Canvas x:Name="LayerListCanvas" HorizontalAlignment="Right" VerticalAlignment="Top" 
                Width="150" Height="180" Margin="0,10,10,0" Visibility="Visible" Grid.Row="0" Grid.Column="0">
            <Rectangle Canvas.Left="0" Canvas.Top="4" Width="150" Height="180"
                       RadiusX="10" RadiusY="10" Fill="#22000000" />
            <Rectangle Canvas.Left="0" Canvas.Top="0" Width="150" Height="180"
                       RadiusX="10" RadiusY="10" Fill="#775C90B2" Stroke="Gray" />
            <Rectangle Canvas.Left="10" Canvas.Top="17" Width="130" Height="165"
                       RadiusX="5" RadiusY="5" Fill="#FFFFFFFF" Stroke="DarkGray" />
            <TextBlock Text="Layer Visibility" Canvas.Left="15" Canvas.Top="2" Foreground="Black" />
            <ScrollViewer Grid.Row="2" Canvas.Left="10" Canvas.Top="15" Width="130" Height="165" 
                          HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Auto" >
                <ListBox x:Name="LayerVisibilityListBox" >
                    <ListBox.ItemTemplate>
                        <DataTemplate>
                            <CheckBox Margin="2" Name="{Binding LayerIndex}" Content="{Binding LayerName}" 
                                      Tag="{Binding ServiceName}" IsChecked="{Binding Visible}" 
                                      ClickMode="Press" Click="CheckBox_Click"   />
                        </DataTemplate>
                    </ListBox.ItemTemplate>
                </ListBox>
            </ScrollViewer>
        </Canvas>


AND THE CODE BEHIND IS:

void DynamicLayer_Initialized(object sender, EventArgs args)
        {
            ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer dynamicServiceLayer =
                sender as ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer;
            if (dynamicServiceLayer.VisibleLayers == null)
                dynamicServiceLayer.VisibleLayers = GetDefaultVisibleLayers(dynamicServiceLayer);
            UpdateLayerList(dynamicServiceLayer);
        }

        private int[] GetDefaultVisibleLayers(ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer dynamicService)
        {
            List<int> visibleLayerIDList = new List<int>();

            ESRI.ArcGIS.Client.LayerInfo[] layerInfoArray = dynamicService.Layers;

            for (int index = 0; index < layerInfoArray.Length; index++)
            {
                if (layerInfoArray[index].DefaultVisibility)
                    visibleLayerIDList.Add(index);
            }

            return visibleLayerIDList.ToArray();
        }


        private void UpdateLayerList(ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer dynamicServiceLayer)
        {
            int[] visibleLayerIDs = dynamicServiceLayer.VisibleLayers;

            if (visibleLayerIDs == null)
                visibleLayerIDs = GetDefaultVisibleLayers(dynamicServiceLayer);

            List<LayerListData> visibleLayerList = new List<LayerListData>();

            ESRI.ArcGIS.Client.LayerInfo[] layerInfoArray = dynamicServiceLayer.Layers;

            for (int index = 0; index < layerInfoArray.Length; index++)
            {
                visibleLayerList.Add(new LayerListData()
                {
                    Visible = visibleLayerIDs.Contains(index),
                    ServiceName = dynamicServiceLayer.ID,
                    LayerName = layerInfoArray[index].Name,
                    LayerIndex = index
                });
            }
            
            LayerVisibilityListBox.ItemsSource = visibleLayerList;        }


        void CheckBox_Click(object sender, RoutedEventArgs e)
        {
            CheckBox tickedCheckBox = sender as CheckBox;

            string serviceName = tickedCheckBox.Tag.ToString();
            bool visible = (bool)tickedCheckBox.IsChecked;

            int layerIndex = Int32.Parse(tickedCheckBox.Name);

            ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer dynamicServiceLayer = MyMap.Layers[serviceName] as
                ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer;

            List<int> visibleLayerList =
                dynamicServiceLayer.VisibleLayers != null
                ? dynamicServiceLayer.VisibleLayers.ToList() : new List<int>();

            if (visible)
            {
                if (!visibleLayerList.Contains(layerIndex))
                    visibleLayerList.Add(layerIndex);
            }
            else
            {
                if (visibleLayerList.Contains(layerIndex))
                    visibleLayerList.Remove(layerIndex);
            }

            dynamicServiceLayer.VisibleLayers = visibleLayerList.ToArray();

            if (visibleLayerList.Count < 1)
            {
                MyMap.Extent = MyMap.Extent;
            }
        }
 public class LayerListData
    {
        public bool Visible { get; set; }
        public string ServiceName { get; set; }
        public string LayerName { get; set; }
        public int LayerIndex { get; set; }
    }

Re: Get the list of layers (in ArcGISDynamicMapServiceLayer) in the listbox at runtim

DominiqueBroux — Sat, 11 Dec 2021 09:35:11 GMT

Is that possible first of all?

Sure : see sample http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#SubLayerList

 
<CheckBox Margin="2" Name="{Binding LayerIndex}" Content="{Binding LayerName}" 
        Tag="{Binding ServiceName}" IsChecked="{Binding Visible}" 
         ClickMode="Press" Click="CheckBox_Click"   />

From SL4, binding to the name property is no more working. The sample has been adapted in order not to use this binding.

Re: Get the list of layers (in ArcGISDynamicMapServiceLayer) in the listbox at runtim

KeithGanzenmuller — Thu, 27 Jan 2011 18:20:24 GMT

I am a little confused by the reply, can someone straighten me out.

Do the sub layers of a dynamic map service layer have a visible property?
The only one I have been able to use is the DefaultVisibilty which tells you if the sub-layer is visible when the layer is initialized.
Is that right?

Is there another way to turn sub-layers on and off other than to use the VisibleLayers property of the parent layer?

Keith

Re: Get the list of layers (in ArcGISDynamicMapServiceLayer) in the listbox at runtim

KirkKuykendall — Thu, 27 Jan 2011 19:03:10 GMT

One of the nice benefits of the legend is that LayerItemViewModel.IsVisible works for this. Sometimes it gets out of synch with the map though (when user zooms in really quick), so I ended up exposing a button that calls Legend.Refresh.

topic Get the list of layers (in ArcGISDynamicMapServiceLayer) in the listbox at runtime. in ArcGIS API for Silverlight Questions

Get the list of layers (in ArcGISDynamicMapServiceLayer) in the listbox at runtime.

Re: Get the list of layers (in ArcGISDynamicMapServiceLayer) in the listbox at runtim

Re: Get the list of layers (in ArcGISDynamicMapServiceLayer) in the listbox at runtim

Re: Get the list of layers (in ArcGISDynamicMapServiceLayer) in the listbox at runtim