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VectorItemsLayer.Data Property

Specifies the data source for the vector items layer.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v19.1.dll

Declaration

[DefaultValue(null)]
public IMapDataAdapter Data { get; set; }
<DefaultValue(Nothing)>
Public Property Data As IMapDataAdapter

Property Value

Type Default Description
IMapDataAdapter

null

An object implementing the IMapDataAdapter interface.

Remarks

For more examples of the Data property in use, refer to the Providing Data Examples topic.

Examples

The following example demonstrates how to create an array of vector items and display them on a map.

To show vector items on a map, do the following:

  1. Create a VectorItemsLayer and add it to the MapControl.Layers collection;
  2. Create a MapItemStorage object and assign it to the VectorItemsLayer.Data property;
  3. Generate an array of MapItem class descendants (e.g., MapCallout) and add this array to the MapItemStorage.Items property.

The code below illustrates how this can be done.

using System;
using System.Windows.Forms;
using DevExpress.XtraMap;

namespace AddItemsManually {

    public partial class Form1 : Form {

        public Form1() {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e) {
            // Create a map control with initial settings and add it to the form.
            MapControl map = new MapControl() 
                             { Dock = DockStyle.Fill, ZoomLevel = 4, CenterPoint = new GeoPoint(43, 15) };
            this.Controls.Add(map);

            // Create a layer to load image tiles from OpenStreetMap.
            ImageLayer tileLayer = new ImageLayer();
            tileLayer.DataProvider = new OpenStreetMapDataProvider();
            map.Layers.Add(tileLayer);

            // Create a layer to display vector items.
            VectorItemsLayer itemsLayer = new VectorItemsLayer();
            map.Layers.Add(itemsLayer);

            // Create a storage for map items and generate them.
            MapItemStorage storage = new MapItemStorage();
            MapItem[] capitals = GetCapitals();
            storage.Items.AddRange(capitals);
            itemsLayer.Data = storage;
        }

        // Create an array of callouts for 5 capital cities.
        MapItem[] GetCapitals() {
            return new MapItem[] { 
                new MapCallout() { Text = "London", Location = new GeoPoint(51.507222, -0.1275) },
                new MapCallout() { Text = "Rome", Location = new GeoPoint(41.9, 12.5) },
                new MapCallout() { Text = "Paris", Location = new GeoPoint(48.8567, 2.3508) },
                new MapCallout() { Text = "Berlin", Location = new GeoPoint(52.52, 13.38) },
                new MapCallout() { Text = "Madrid", Location = new GeoPoint(40.4, -3.68) }
            };
        }
    }

}
See Also