DataDashboardItem.DataSource Property
Gets or sets a data source to which the dashboard item is bound.
Namespace: DevExpress.DashboardCommon
Assembly: DevExpress.Dashboard.v19.2.Core.dll
Declaration
Property Value
Type | Default | Description |
---|---|---|
IDashboardDataSource | *null* | An object implementing the IDashboardDataSource interface that specifies a data source to which the dashboard item is bound. |
Remarks
All data-aware dashboard items expose the DataSource property that specifies a data source to which this item is actually bound. The DataDashboardItem.DataMember property specifies the required data member in this data source.
To access the collection of existing dashboard data sources, use the Dashboard.DataSources property.
Note
For DashboardSqlDataSource or DashboardEFDataSource, specify the required data member using the DataDashboardItem.DataMember property.
Example
The following example demonstrates how to bind a Choropleth Map dashboard item to data in code.
Note
A complete sample project is available at https://github.com/DevExpress-Examples/how-to-bind-a-choropleth-map-dashboard-item-to-data-in-code-e5010.
Imports System.Windows.Forms
Imports DevExpress.DashboardCommon
Imports DevExpress.DataAccess.ConnectionParameters
Imports DevExpress.DataAccess.Sql
Namespace Dashboard_CreateChoroplethMap
Partial Public Class Form1
Inherits Form
Public Sub New()
InitializeComponent()
' Creates a new dashboard and a data source for this dashboard.
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)
' Creates a choropleth map dashboard item and specifies its data source.
Dim choroplethMap As New ChoroplethMapDashboardItem()
choroplethMap.DataSource = dataSource
choroplethMap.DataMember = "Countries"
' Loads the map of the world.
choroplethMap.Area = ShapefileArea.WorldCountries
' Specifies a binding between the required map attribute and the data source field.
choroplethMap.AttributeName = "NAME"
choroplethMap.AttributeDimension = New Dimension("Country")
' Creates a ValueMap object with a measure that provides data for color map shapes.
' Then, adds this object to the Maps collection of the choropleth map dashboard item.
Dim populationMap As New ValueMap(New Measure("Population"))
choroplethMap.Maps.Add(populationMap)
' Adds the choropleth map dashboard item to the dashboard and opens this
' dashboard in the Dashboard Viewer.
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 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.