WMS service catalog

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Connect to a WMS service and show the available layers and sublayers.

Image of WMS service catalog

Use case

WMS services often contain many layers and sublayers. Presenting the layers and sublayers in a UI allows you to explore what is available in the service and add individual layers to a map.

How to use the sample

  1. Open the sample. A hierarchical list of layers and sublayers will appear.
  2. Select a layer to enable it for display. If the layer has any children, the children will also be selected.

How it works

  1. A WmsService is created and loaded.
  2. WmsService has a ServiceInfo property, which is a WmsServiceInfo. WmsServiceInfo has a WmsLayerInfo object for each layer (excluding sublayers) in the LayerInfos collection.
  3. A method is called to recursively discover sublayers for each layer. Layers are wrapped in a view model and added to a list.

    • The view model has a Select method which recursively selects or deselects itself and sublayers.
    • The view model tracks the children and parent of each layer.
  4. Once the layer selection has been updated, another method is called to create a new WmsLayer from a list of selected WmsLayerInfo.

Relevant API

  • WmsLayer(List)
  • WmsLayerInfo
  • WmsService
  • WmsServiceInfo

About the data

This sample shows forecasts guidance warnings from an ArcGIS REST service produced by the U.S. National Weather Service. The map shows fronts, highs, and lows, as well as areas of forecast precipitation.

Tags

catalog, OGC, web map service, WMS

Sample Code

WmsServiceCatalog.xamlWmsServiceCatalog.xaml.cs
                       
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<?xml version="1.0" encoding="utf-8"?>

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Xamarin.Forms;assembly=Esri.ArcGISRuntime.Xamarin.Forms"
             x:Class="ArcGISRuntime.Samples.WmsServiceCatalog.WmsServiceCatalog">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto" />
            <RowDefinition Height="150" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Label Text="Select a WMS layer from the list for display:" Grid.Row="0" />
        <ListView x:Name="MyDisplayList" Grid.Row="1" ItemSelected="MyDisplayList_SelectionChanged">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <TextCell Text="{Binding Name}" />
                </DataTemplate>
            </ListView.ItemTemplate>
        </ListView>
        <esriUI:MapView x:Name="MyMapView" Grid.Row="2" />
    </Grid>
</ContentPage>

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