DataSourceAdapterBase.DataSource Property

Specifies the data source to provide data for a data adapter.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v24.1.dll

NuGet Package: DevExpress.Win.Map

Declaration

C#

[DefaultValue(null)]
public object DataSource { get; set; }

VB.NET

<DefaultValue(Nothing)>
Public Property DataSource As Object

Property Value

Type	Default	Description
Object	null	A Object.

Example

This example demonstrates how to generate bubble charts for a map control. Do the following:

• Create a VectorItemsLayer object and add it to the map control.
• Create a BubbleChartDataAdapter object and assign it to the VectorItemsLayer.Data property.
• Generate a data source with data for bubble charts and assign it to the DataSourceAdapterBase.DataSource property.
• Specify the mappings for bubble chart properties to corresponding columns in a datasource (a MapBubbleMappingInfo object that can be accessed using the BubbleChartDataAdapter.Mappings property).
• Specify the attribute mappings that are used to provide additional information about the map item to a map control.(an MapItemAttributeCollection object that can be accessed using the BubbleChartDataAdapter.Mappings property).

Form1.cs

    // Specify data for the bubble layer.
    BubbleLayer.Data = CreateData();
private IMapDataAdapter CreateData() {
    BubbleChartDataAdapter adapter = new BubbleChartDataAdapter() {
        DataSource = LoadData(),
        MeasureRules = CreateMeasureRules(),
        ItemMaxSize = 60,
        ItemMinSize = 10
    };

    #region #Mappings
    // Map the properties of chart items to the appropriate fields in the data source.
    adapter.Mappings.Latitude = "glat";
    adapter.Mappings.Longitude = "glon";
    adapter.Mappings.Value = "mag";
    #endregion #Mappings

    // Create attribute mappings to provide additional information about map items to the map.
    adapter.AttributeMappings.Add(new MapItemAttributeMapping("Magnitude", "mag"));
    adapter.AttributeMappings.Add(new MapItemAttributeMapping("Year", "yr"));
    adapter.AttributeMappings.Add(new MapItemAttributeMapping("Month", "mon"));
    adapter.AttributeMappings.Add(new MapItemAttributeMapping("Day", "day"));
    adapter.AttributeMappings.Add(new MapItemAttributeMapping("Depth", "dep"));

    return adapter;
}

private DataTable LoadData() {
    DataSet ds = new DataSet();
    ds.ReadXml(dataPath);
    DataTable dt = ds.Tables[0];
    dt.DefaultView.RowFilter = string.Format(CultureInfo.InvariantCulture, "(mag >= {0}) AND (mag <= {1})", minMagnitude, maxMagnitude);

    return ds.Tables[0];
}

private MeasureRules CreateMeasureRules() {
    MeasureRules measureRules = new MeasureRules();

    measureRules.ApproximateValues = true;
    measureRules.RangeDistribution = new LinearRangeDistribution();

    for (int i = minMagnitude; i < maxMagnitude; i++) {
        measureRules.RangeStops.Add(i);
    }

    return measureRules;
}

Form1.vb

    ' Specify data for the bubble layer.
    BubbleLayer.Data = CreateData()
Private Function CreateData() As IMapDataAdapter
    Dim adapter As New BubbleChartDataAdapter() With {.DataSource = LoadData(), .MeasureRules = CreateMeasureRules(), .ItemMaxSize = 60, .ItemMinSize = 10}

    '            #Region "#Mappings"
    ' Map the properties of chart items to the appropriate fields in the data source.
    adapter.Mappings.Latitude = "glat"
    adapter.Mappings.Longitude = "glon"
    adapter.Mappings.Value = "mag"

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the DataSource property.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

winforms-map-bind-to-xml-data/CS/WinForms_MapControl_ListAdapter/Form1.cs#L52

adapter.DataSource = source;

winforms-map-aggregate-vector-items-using-a-clusterer/CS/ClustererSample/Form1.cs#L19

private void Form1_Load(object sender, EventArgs e) {
    DataAdapter.DataSource = LoadData();
    DistanceBasedClusterer clusterer = new DistanceBasedClusterer {

winforms-map-customize-mini-map-layers/CS/MiniMapLayers/Form1.cs#L94

ListSourceDataAdapter adapter = new ListSourceDataAdapter();
adapter.DataSource = data;
adapter.Mappings.Latitude = "Latitude";

VB.NET

winforms-map-bind-to-xml-data/VB/WinForms_MapControl_ListAdapter/Form1.vb#L39

Dim adapter As ListSourceDataAdapter = New ListSourceDataAdapter()
adapter.DataSource = source
adapter.Mappings.Latitude = "Latitude"

winforms-map-aggregate-vector-items-using-a-clusterer/VB/ClustererSample/Form1.vb#L31

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
    DataAdapter.DataSource = LoadData()
    Dim clusterer As DistanceBasedClusterer = New DistanceBasedClusterer With {.ItemMaxSize = 60, .ItemMinSize = 14, .GroupProvider = New AttributeGroupProvider With {.AttributeName = "LocationName"}}

winforms-map-customize-mini-map-layers/VB/MiniMapLayers/Form1.vb#L70

Dim adapter As DevExpress.XtraMap.ListSourceDataAdapter = New DevExpress.XtraMap.ListSourceDataAdapter()
adapter.DataSource = data
adapter.Mappings.Latitude = "Latitude"