ValueMap Class

Contains a measure that provides data to color a map in the ChoroplethMapDashboardItem.

Namespace: DevExpress.DashboardCommon

Assembly: DevExpress.Dashboard.v22.1.Core.dll

Declaration

C#

public class ValueMap :
    ChoroplethMap

VB.NET

Public Class ValueMap
    Inherits ChoroplethMap

Example

The following example demonstrates how to bind a Choropleth Map dashboard item to data in code.

View Example

Form1.cs

using System.Windows.Forms;
using DevExpress.DashboardCommon;
using DevExpress.DataAccess.ConnectionParameters;
using DevExpress.DataAccess.Sql;

namespace Dashboard_CreateChoroplethMap {
    public partial class Form1 : DevExpress.XtraEditors.XtraForm
    {
        public Form1() {
            InitializeComponent();

            Dashboard dashboard = new Dashboard();

            DashboardSqlDataSource dataSource = new DashboardSqlDataSource();
            CustomSqlQuery sqlQuery = new CustomSqlQuery("Countries", "select * from Countries");
            dataSource.ConnectionParameters = new Access97ConnectionParameters(@"..\..\Data\countriesDB.mdb", "", "");
            dataSource.Queries.Add(sqlQuery);

            ChoroplethMapDashboardItem choroplethMap = new ChoroplethMapDashboardItem();
            choroplethMap.DataSource = dataSource;
            choroplethMap.DataMember = "Countries";

            choroplethMap.Area = ShapefileArea.WorldCountries;

            choroplethMap.AttributeName = "NAME";
            choroplethMap.AttributeDimension = new Dimension("Country");

            ValueMap populationMap = new ValueMap(new Measure("Population"));
            choroplethMap.Maps.Add(populationMap);

            dashboard.Items.Add(choroplethMap);
            dashboardViewer1.Dashboard = dashboard;
        }
    }
}

Form1.vb

Imports System.Windows.Forms
Imports DevExpress.DashboardCommon
Imports DevExpress.DataAccess.ConnectionParameters
Imports DevExpress.DataAccess.Sql

Namespace Dashboard_CreateChoroplethMap
    Partial Public Class Form1
        Inherits DevExpress.XtraEditors.XtraForm

        Public Sub New()
            InitializeComponent()

            Dim dashboard As New Dashboard()

            Dim dataSource As New DashboardSqlDataSource()
            Dim sqlQuery As New CustomSqlQuery("Countries", "select * from Countries")
            dataSource.ConnectionParameters = New Access97ConnectionParameters("..\..\Data\countriesDB.mdb", "", "")
            dataSource.Queries.Add(sqlQuery)

            Dim choroplethMap As New ChoroplethMapDashboardItem()
            choroplethMap.DataSource = dataSource
            choroplethMap.DataMember = "Countries"

            choroplethMap.Area = ShapefileArea.WorldCountries

            choroplethMap.AttributeName = "NAME"
            choroplethMap.AttributeDimension = New Dimension("Country")

            Dim populationMap As New ValueMap(New Measure("Population"))
            choroplethMap.Maps.Add(populationMap)

            dashboard.Items.Add(choroplethMap)
            dashboardViewer1.Dashboard = dashboard
        End Sub
    End Class
End Namespace

Related GitHub Examples

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

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#

how-to-customize-a-palette-of-the-choropleth-map-e5108/CS/Dashboard_ChoroplethMapCustomPalette/Form1.cs#L16

ChoroplethMapDashboardItem map = (ChoroplethMapDashboardItem)dashboard.Items[0];
ValueMap populationMap = (ValueMap)map.Maps[0];

how-to-bind-a-choropleth-map-dashboard-item-to-data-in-code-e5010/CS/Dashboard_CreateChoroplethMap/Form1.cs#L28

ValueMap populationMap = new ValueMap(new Measure("Population"));
choroplethMap.Maps.Add(populationMap);

win-viewer-map-custom-shape-file/CS/WindowsFormsMapCustomShape/Form1.cs#L31

map.AttributeDimension = new Dimension("State");
ValueMap revenueYTDMap = new ValueMap(new Measure("RevenueYTD (Sum)"));
map.Maps.Add(revenueYTDMap);

VB.NET

how-to-customize-a-palette-of-the-choropleth-map-e5108/VB/Dashboard_ChoroplethMapCustomPalette/Form1.vb#L18

Dim map As ChoroplethMapDashboardItem = CType(dashboard.Items(0), ChoroplethMapDashboardItem)
Dim populationMap As ValueMap = CType(map.Maps(0), ValueMap)

how-to-bind-a-choropleth-map-dashboard-item-to-data-in-code-e5010/VB/Dashboard_CreateChoroplethMap/Form1.vb#L29

Dim populationMap As New ValueMap(New Measure("Population"))
choroplethMap.Maps.Add(populationMap)

win-viewer-map-custom-shape-file/VB/WindowsFormsMapCustomShape/Form1.vb#L31

map.AttributeDimension = New Dimension("State")
Dim revenueYTDMap As New ValueMap(New Measure("RevenueYTD (Sum)"))
map.Maps.Add(revenueYTDMap)

Implements

ICustomPropertyProvider

Inheritance

Object

DataItemContainer

NamedDataItemContainer

ChoroplethMap

ValueMap