topic Re: Specify Map Service layers to draw in ArcGIS API for Silverlight Questions

Specify Map Service layers to draw

JayKappy — Thu, 09 Dec 2010 14:09:10 GMT

WMS I did this

XAML:

<esri:WmsLayer ID="AGSWMSLayer" 
Url="http://serverapps.esri.com/ArcGIS/services/California/MapServer/WMSServer"
Initialized="WmsLayer_Initialized"/>

VB:

Private Sub WmsLayer_Initialized(ByVal sender As System.Object, ByVal e As System.EventArgs)
    Dim myWmsLayer As ESRI.ArcGIS.Client.Toolkit.DataSources.WmsLayer
    myWmsLayer = TryCast(MyMap.Layers("AGSWMSLayer"), ESRI.ArcGIS.Client.Toolkit.DataSources.WmsLayer)
    ' You can control the visibility of which WMS layers are displayed by adding the
    ' sub-LayerID's to the String Array. 
    Dim myVisibleWmsLayers() As String = {"0", "1", "2", "3", "4", "5", "6", "7", "8"}
    myWmsLayer.Layers = myVisibleWmsLayers
End Sub

But now I have a ArcGISDynamicMapServiceLayer.....

I cant figure out how to specify which layer draws....this below line has to change...how do I DIM the DynamicMapSerive Layer....As its not a GeoRSSLayer, HeatMapLayer, OpenStreetMapLayer, or WMS Layer

    Dim myWmsLayer As ESRI.ArcGIS.Client.Toolkit.DataSources.WmsLayer

Any thoughts on how to specify individual layers in the Map Service to draw?

Thanks

Re: Specify Map Service layers to draw

JayKappy — Thu, 09 Dec 2010 14:11:24 GMT

I tried this but all three layers drew anyway....
Trying to specify the First layer with the 0

<esri:ArcGISDynamicMapServiceLayer ID="MyLOGISLayer"
Url="http://gis.logis.org/arcgis/rest/services/SOMESERVER/MapServer/0"/>

Re: Specify Map Service layers to draw

DominiqueBroux — Thu, 09 Dec 2010 15:42:25 GMT

<esri:ArcGISDynamicMapServiceLayer ID="MyLOGISLayer"
Url="http://gis.logis.org/arcgis/rest/services/SOMESERVER/MapServer/0"/>

Due to the trailing '/0', http://gis.logis.org/arcgis/rest/services/SOMESERVER/MapServer/0 is not a map service end point but a feature layer end point. So it can't work.

Try:
<esri:ArcGISDynamicMapServiceLayer ID="MyLOGISLayer"
Url="http://gis.logis.org/arcgis/rest/services/SOMESERVER/MapServer" />

Then if your service is not cached, you can set the property VisibleLayers to filter the visible layers.

Re: Specify Map Service layers to draw

JenniferNery — Thu, 09 Dec 2010 15:43:56 GMT

When working with ArcGISDynamicMapServiceLayer, there is a VisibleLayers property that can identify which layers need to be drawn.
API Reference: http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer~VisibleLayers.html
SDK Sample: http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#SubLayerList

Re: Specify Map Service layers to draw

JayKappy — Sun, 12 Dec 2021 02:50:17 GMT

Bit confused because I am getting two completly different exmaples here...the second one shows how to display all the layers as selectable....
The first gives you a filter...more of what I am looking for...LOOKING at this example you gave me
http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer~VisibleLayers.html

Although Notice the begining of the vb code
' The myArcGISDynamicMapServiceLayer (an ArcGISDynamicServiceLayer object) and TextBlock_VisibleLayers
' (a TextBlock object) were defined previously in the XAML or code-behind.
So how am I to know whats going on there? If I cannot see it...
I want to specify individual layers so I uncommented the two lines to specify which layers to include

Of course I error out:
TextBlock_VisibleLayers

This is obviously being set in the xaml, of which I cannot see in the example???????

XAML

<esri:ArcGISDynamicMapServiceLayer ID="MyLOGISLayer"
 Url="http://gis.logis.org/arcgis/rest/services/SomeServer/MapServer"
 Initialized="LOGIS_Initialized"/>

    Private Sub LOGIS_Initialized(ByVal sender As System.Object, ByVal e As System.EventArgs)

        ' The myArcGISDynamicMapServiceLayer (an ArcGISDynamicServiceLayer object) and TextBlock_VisibleLayers 
        ' (a TextBlock object) were defined previously in the XAML or code-behind.

        ' Get the first layer in the LayerInfo collection. 
        Dim myArcGISDynamicMapServiceLayer As ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer = MyMap.Layers.Item(0)

        ' VisibleLayers (Read/Write)
        ' ==========================

        ' In this example there are three sub-layers (0, 1, 2) that are turned on by default for the 
        ' myArcGISDynamicMapServiceLayer. 

        ' Uncomment the next two lines of code to set only the 2nd and 3rd sub-layers to be visible.
        Dim myVisibleLayers2() As Integer = {1}
        myArcGISDynamicMapServiceLayer.VisibleLayers = myVisibleLayers2

        ' Display which sub-layers (via their index number) are visible in a TextBlock.
        Dim myVisibleLayers() As Integer = myArcGISDynamicMapServiceLayer.VisibleLayers
        If myVisibleLayers IsNot Nothing Then
            Dim myVisibleLayersText As String = "Number VisibleLayers: " + myVisibleLayers.Length.ToString
            Dim myVisibleLayersText2 As String = ""
            Dim I2 As Integer
            For I2 = 0 To myVisibleLayers.Length - 1
                myVisibleLayersText2 = myVisibleLayersText2 + " " + myVisibleLayers(I2).ToString
            Next
            TextBlock_VisibleLayers.Text = myVisibleLayersText + ". VisibleLayers ID's: " + myVisibleLayersText2
        Else
            TextBlock_VisibleLayers.Text = "[VisibleLayers not set - Meaning all layers are visible.]"
        End If

    End Sub

Re: Specify Map Service layers to draw

JayKappy — Thu, 09 Dec 2010 16:27:30 GMT

.......................................................................

Re: Specify Map Service layers to draw

JayKappy — Sun, 12 Dec 2021 02:50:19 GMT

Let me scratch the last two entries...

I was able to get this one working...
http://help.arcgis.com/en/webapi/silverlight/samples/start.htm#SubLayerList
1. I created another selection box to turn on and off
2. I could not figure out how to get them into my existing layer list box
3. I NEED TO Figure out how to get them in my existing Layer List

This example:
http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer~VisibleLayers.html
1. Was confusing because it was referencing things I could not see. Including objects on the XAML page. If you cant see them set up its very hard as a novice to visualize that.
2. I like this option but cant figure out the TextBlock thing that it is referencing....AGAIN I woudl like to push these two my existing layer list...

So with all that I am still looking....I woudl love to get both examples workign as a learning tool for myself...any other thoughts you could provide would be much appreciated...

Thanks

I see that my Layer path to include in the box is not the same as the example
<ListBox x:Name="MyList" ItemsSource="{Binding ElementName=MyMap, Path=Layers}">
vs
<ListBox Margin="0,5,0,0" ItemsSource="{Binding ElementName=MyMap, Path=Layers.[DynamicLayerCalifornia].Layers}"
Is there a way to combine them to give the simple list and then the breakdown of individual layers in the DynamicLayerCalifornia?

CURRENT LAYER LIST TO DISPLAY LAYERS IN MAP

            <!-- LAYER LIST  -->
            <Grid>
                <Border Background="#996495ED" BorderThickness="1" CornerRadius="5"
            HorizontalAlignment="right"  VerticalAlignment="bottom"
            Margin="10,10,10,10" Padding="5" BorderBrush="red" >

                    <ListBox x:Name="MyList" ItemsSource="{Binding ElementName=MyMap, Path=Layers}">
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                                <StackPanel Orientation="Horizontal">
                                    <!--Layer visibility checkbox-->
                                    <CheckBox IsChecked="{Binding Visible, Mode=TwoWay}" />
                                    <!--Opacity slider-->
                                    <Slider Margin="-5,0,0,0" Minimum="0" Maximum="1" Width="30" 
                                Value="{Binding Opacity, Mode=TwoWay}" Height="18" />
                                    <!--Layer name-->
                                    <TextBlock Text="{Binding ID, Mode=OneWay}" Margin="5,0,0,0" > 
                            <!-- Tooltip on hover-->
                                <ToolTipService.ToolTip>
                                    <StackPanel MaxWidth="400">
                                      <!--  <TextBlock FontWeight="Bold" Text="{Binding CopyrightText}" TextWrapping="Wrap" />
                                        <TextBlock Text="{Binding Description}" TextWrapping="Wrap" />  -->
                                        <TextBlock FontWeight="Bold" Text="HUH" TextWrapping="Wrap" />
                                        <TextBlock Text="WOW" TextWrapping="Wrap" />
                                    </StackPanel>
                                </ToolTipService.ToolTip>
                            </TextBlock>
                                </StackPanel>
                            </DataTemplate>
                        </ListBox.ItemTemplate>
                    </ListBox>
                    
                </Border>
            </Grid>

Re: Specify Map Service layers to draw

JenniferNery — Thu, 09 Dec 2010 17:43:05 GMT

The two examples are actually the same in that they both affect the VisibleLayers property.

In the SDK Sample, all sub layers are by default visible until you uncheck them as is done in the CheckBox_Click event handler.

In the API Reference sample, it simply demonstrates how VisibleLayers property can be set.
For example, for a map service with 3 sub layers (ID's 0, 1, 2), you can turn off visibility of ID=0

If you do the following:

MyArcGISDynamicMapServiceLayer.VisibleLayers = New Integer() {1, 2}

Re: Specify Map Service layers to draw

JayKappy — Sun, 12 Dec 2021 02:50:22 GMT

Can we start with the API example:
In the API example I get errors because I dont have an Textblock object...so the line errors out on TextBlock_VisibleLayers.Text
If I remove that part of it where it shows the sub layers and the textblock as seen below it still draws all three layers.

I really appreciate your help here....very apprecaited....

Remove this code block...including this

TextBlock_VisibleLayers.Text = myVisibleLayersText + ". VisibleLayers ID's: " + myVisibleLayersText2

XAML

<esri:ArcGISDynamicMapServiceLayer ID="Logis Layers" 
 Url="http://gis.logis.org/arcgis/rest/services/Something/MapServer"
 Initialized="LOGIS_Initialized"/>

    Private Sub LOGIS_Initialized(ByVal sender As System.Object, ByVal e As System.EventArgs)

        ' Get the first layer in the LayerInfo collection. 
        Dim myArcGISDynamicMapServiceLayer As ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer = MyMap.Layers.Item(0)

        ' Uncomment the next two lines of code to set only the 2nd and 3rd sub-layers to be visible.
        Dim myVisibleLayers2() As Integer = {1}
        myArcGISDynamicMapServiceLayer.VisibleLayers = myVisibleLayers2
End Sub

Re: Specify Map Service layers to draw

JenniferNery — Sun, 12 Dec 2021 02:50:25 GMT

Take the following for example:
XAML-code:

    <esri:Map x:Name="MyMap" >
            <esri:ArcGISDynamicMapServiceLayer ID="MyLayer" Initialized="ArcGISDynamicMapServiceLayer_Initialized"
                Url="http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer" />
    </esri:Map>

Code-behind:

Private Sub ArcGISDynamicMapServiceLayer_Initialized(sender As Object, e As System.EventArgs)
 Dim l As ArcGISDynamicMapServiceLayer = TryCast(sender, ArcGISDynamicMapServiceLayer)
 l.VisibleLayers = New Integer() {0}
End Sub

If all 3 sub layers were visible, it would look like this:
http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Specialty/ESRI_StateCityHighway_USA/MapServer/export?bbox=-127.893138091003,5.39213971511016,-63.555347026621,70.5993603884707

But since in the Initialized event handler, I specified that only sub layer ID=0 is visible, the rest of the layers were not drawn.

I have no idea why this does not work for you because I don't have access to your map service and I'm not sure if the first layer on your map is the ArcGISDynamicMapServiceLayer.

If you intend to get the layer by index it is:

Dim l As ArcGISDynamicMapServiceLayer =  TryCast(Me.MyMap.Layers(0), ArcGISDynamicMapServiceLayer)

But a better practice for retrieving the layer is to get them by ID.

Dim l As ArcGISDynamicMapServiceLayer = TryCast(Me.MyMap.Layers("MyLayer"), ArcGISDynamicMapServiceLayer)

Re: Specify Map Service layers to draw

JayKappy — Sun, 12 Dec 2021 02:50:27 GMT

FIRST OFF WHERE DID YOU FIND THAT EXAMPLE...IT WAS NOT IN ANY EXAMPLE YOU GAVE ME....I qwas going off of what you gave me:
http://help.arcgis.com/en/webapi/silverlight/apiref/ESRI.ArcGIS.Client~ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer~VisibleLayers.html
THATS ALL I WAS LOOKING FOR...
Now that makes sense...I was referencing the online example from the API...the one you pointed me to...It did not look anything like what you just sent...and much more complex...all of that to simply define what layers you want to see....Was it more involved to push to a textblock????
Your example should be on the API site!!!

I was trying to break that example down into this: The first few lines but it was not working...

        '' Get the first layer in the LayerInfo collection. 
        Dim myArcGISDynamicMapServiceLayer As ESRI.ArcGIS.Client.ArcGISDynamicMapServiceLayer = MyMap.Layers.Item(0)

        '' Uncomment the next two lines of code to set only the 2nd and 3rd sub-layers to be visible.
        Dim myVisibleLayers2() As Integer = {1}
        myArcGISDynamicMapServiceLayer.VisibleLayers = myVisibleLayers2

BUT I REALLY do apprecaite the help...its greatly appreciated....

So in your example would you do this?

        Dim l As ArcGISDynamicMapServiceLayer = TryCast(Me.MyMap.Layers(1), ArcGISDynamicMapServiceLayer)
        l.VisibleLayers = New Integer() {0}

        Dim l As ArcGISDynamicMapServiceLayer = TryCast(Me.MyMap.Layers("MyLayer"), ArcGISDynamicMapServiceLayer)
        l.VisibleLayers = New Integer() {0}

THANK YOU

Re: Specify Map Service layers to draw

JenniferNery — Thu, 09 Dec 2010 20:54:25 GMT

The API Reference I linked you to is one that demonstrates how you can retrieve the current value of VisibleLayers property and display on a TextBlock.

The SDK Sample I linked you to is one that gets and sets the VisibleLayers property dynamically based on checked sub layers.

They are both valid examples.

The code snippet in Post #10 is no different from our SDK sample. It is just simpler because I hardcoded the sub layer ID I want visible.

To answer your other question, it is preferrable to get the layer by ID as I have already mentioned in my previous post. The reason is that you may be adding/removing layers or change the order of your layers later on. While the layer index may change in these scenarios, the ID will not.