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GeoJsonFileDataAdapter Class

A data adapter that loads data from GeoJSON files, and displays it on vector layers.

Namespace: DevExpress.Xpf.Map

Assembly: DevExpress.Xpf.Map.v20.1.dll

Declaration

public class GeoJsonFileDataAdapter :
    MapGeoDataAdapter
Public Class GeoJsonFileDataAdapter
    Inherits MapGeoDataAdapter

Remarks

The Map Control allows you to display data from GeoJSON files that store geographical objects in the JSON format.

The following table lists supported GeoJSON elements and corresponding map items:

GeoJSON element

Map item

Point

MapDot

MultiPoint

A list of MapDot objects

LineString

MapPolyline

MultiLineString

MapPath

Polygon, MultiPolygon

MapPath

GeometryCollection

MapDot, MapDot, MapPath

Follow the steps below to load data from a .GeoJSON file:

  1. Add a VectorLayer object to the MapControl.Layers collection.
  2. Create a GeoJsonFileDataAdapter object.
  3. Specify the path to a GeoJSON file via the MapGeoDataAdapter.FileUri property.
  4. Assign the GeoJsonFileDataAdapter to the VectorLayer.Data property.
  5. Optionally, you can customize generated items in the MapGeoDataAdapter.ShapesLoaded event handler.
<Window xmlns:dxm="http://schemas.devexpress.com/winfx/2008/xaml/map"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:FileDataAdapters"
        x:Class="FileDataAdapters.MainWindow"
        xmlns:sys="clr-namespace:System;assembly=System"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <dxm:MapControl x:Name="mapControl">
            <dxm:ImageLayer>
                <dxm:BingMapDataProvider Kind="Road" 
                                         BingKey="Your-BingKey-here"/>
            </dxm:ImageLayer>
            <dxm:VectorLayer x:Name="vectorLayer" DataLoaded="OnVectorLayerDataLoaded">
                <dxm:VectorLayer.Data>
                    <dxm:GeoJsonFileDataAdapter ShapesLoaded="OnDataAdapterShapesLoaded">
                        <dxm:GeoJsonFileDataAdapter.FileUri>
                            <sys:Uri>pack://application:,,,/FileDataAdapters;component/Data/subway-entrances.geojson</sys:Uri>
                        </dxm:GeoJsonFileDataAdapter.FileUri>
                    </dxm:GeoJsonFileDataAdapter>
                </dxm:VectorLayer.Data>
            </dxm:VectorLayer>
        </dxm:MapControl>
    </Grid>
</Window>

Note: In the example above, the GeoJson file's Build Action is set to Resource.

See Also