DataMember.DataMemberType Property

Gets or sets the data member type.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v24.2.dll

NuGet Package: DevExpress.Charts

Declaration

C#

public ChartDataMemberType DataMemberType { get; set; }

VB.NET

Public Property DataMemberType As ChartDataMemberType

Property Value

Type	Description
ChartDataMemberType	The data member type.

Available values:

Show 23 items

Name	Description
Argument	The data member contains point arguments.
Value	The data member contains point values.
Series	The data member contains values that identify series and are used as series names when a SeriesTemplateAdapter or SeriesTemplateSummaryAdapter generates series.
Color	The data member contains colors that point colorizers apply to series points.
ToolTipHint	The data member contains additional information that can be displayed in the point tooltip. Use the {HINT} placeholder in the ToolTipPointPattern format string to display the hint information.
Open	The data member contains open values of financial series.
High	The data member contains high values of financial series.
Low	The data member contains low values of financial series.
Close	The data member contains close values of financial series.
Weight	The data member contains weight values of Bubble series.
Value_1	The data member contains first point values of series that require two values per point (for example, Range Bar series).
Value_2	The data member contains second point values of series that require two values per point (for example, Range Bar series).
BoxPlotMin	The data member contains minimum values of Box Plot points.
BoxPlotQuartile_1	The data member contains first quartile values of Box Plot points.
BoxPlotMedian	The data member contains median values of Box Plot points.
BoxPlotQuartile_3	The data member contains third quartile values of Box Plot points.
BoxPlotMax	The data member contains maximum values of Box Plot points.
BoxPlotMean	The data member contains mean values of Box Plot points.
BoxPlotOutliers	The data member contains outlier values of Box Plot points.
ErrorBarsNegativeError	For internal use.
ErrorBarsPositiveError	For internal use.
SeriesKey	For internal use.
SeriesColor	For internal use.

Example

This example shows how to create a series that requires one value per argument and populate it with data.

• Create a DataSourceAdapter object.
• Define the adapter DataSourceAdapter.DataSource property.
• Populate the adapter DataSourceAdapterBase.DataMembers collection. You should specify data members that contain arguments and values.
• Use the Series.DataAdapter property to assign the adapter to the series.

C#

using DevExpress.Utils;
using DevExpress.XtraCharts;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

namespace ChartDataAdapters {
    public partial class Form1 : Form {
        readonly TemperatureData temperatureData = new TemperatureData(new Random(9));
        public Form1() {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e) {
            // Create a series.
            Series series = new Series("Temperature", ViewType.Spline);

            // Create a data adapter.
            DataSourceAdapter dataAdapter = new DataSourceAdapter();

            // Specify the data source.
            dataAdapter.DataSource = temperatureData.Points;

            // Create a data member that defines arguments.
            dataAdapter.DataMembers.Add(new DataMember {
                DataMemberType = ChartDataMemberType.Argument,
                ColumnName = "TimeStamp",
                ScaleType = ScaleType.TimeSpan
            });
            // Create a data member that defines values.
            dataAdapter.DataMembers.Add(new DataMember {
                DataMemberType = ChartDataMemberType.Value,
                ColumnName = "Temperature",
                ScaleType = ScaleType.Numerical
            });

            // Assign the data adapter to the series.
            series.DataAdapter = dataAdapter;
        }
    }
    class TemperatureData {
        const int PointsCount = 250;
        readonly TemperaturePoint maxTemperaturePoint = new TemperaturePoint(TimeSpan.Zero, double.MinValue);
        readonly TemperaturePoint minTemperaturePoint = new TemperaturePoint(TimeSpan.MaxValue, double.MaxValue);
        readonly List<TemperaturePoint> points = new List<TemperaturePoint>(PointsCount);
        internal TemperaturePoint MaxTemperaturePoint {
            get { return maxTemperaturePoint; }
        }
        internal TemperaturePoint MinTemperaturePoint {
            get { return minTemperaturePoint; }
        }
        internal double OptimalTemperature {
            get { return 53; }
        }
        internal List<TemperaturePoint> Points {
            get { return points; }
        }
        internal TemperatureData(Random random) {
            double preTemperature = 50;
            for (int i = 0; i < PointsCount; i++) {
                TimeSpan time = TimeSpan.FromSeconds(i);
                double temperature = preTemperature + (random.NextDouble() - 0.5) * 10;
                if (temperature > 90)
                    temperature -= 20;
                if (temperature < 20)
                    temperature += 10;
                TemperaturePoint temperaturePoint = new TemperaturePoint(time, temperature);
                if (temperature < minTemperaturePoint.Temperature)
                    minTemperaturePoint = temperaturePoint;
                if (temperature > maxTemperaturePoint.Temperature)
                    maxTemperaturePoint = temperaturePoint;
                points.Add(temperaturePoint);
                preTemperature = temperature;
            }
        }
    }
    public class TemperaturePoint {
        public TimeSpan TimeStamp { get; private set; }
        public double Temperature { get; private set; }

        internal TemperaturePoint(TimeSpan time, double temperature) {
            this.TimeStamp = time;
            this.Temperature = temperature;
        }
    }
}

VB.NET

Imports DevExpress.Utils
Imports DevExpress.XtraCharts
Imports System
Imports System.Collections.Generic
Imports System.Windows.Forms

Namespace ChartDataAdapters
    Public Partial Class Form1
        Inherits Form

        Private ReadOnly temperatureData As TemperatureData = New TemperatureData(New Random(9))

        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
            ' Create a series.
            Dim series As Series = New Series("Temperature", ViewType.Spline)

            ' Create a data adapter.
            Dim dataAdapter As DataSourceAdapter = New DataSourceAdapter()

            ' Specify the data source.
            dataAdapter.DataSource = temperatureData.Points

            ' Create a data member that defines arguments.
            dataAdapter.DataMembers.Add(New DataMember With {
                .DataMemberType = ChartDataMemberType.Argument,
                .ColumnName = "TimeStamp",
                .ScaleType = ScaleType.TimeSpan
            })
            ' Create a data member that defines values.
            dataAdapter.DataMembers.Add(New DataMember With {
                .DataMemberType = ChartDataMemberType.Value,
                .ColumnName = "Temperature",
                .ScaleType = ScaleType.Numerical
            })

            ' Assign the data adapter to the series.
            series.DataAdapter = dataAdapter
        End Sub
    End Class

    Friend Class TemperatureData
        Const PointsCount As Integer = 250
        Private ReadOnly maxTemperaturePointField As TemperaturePoint = New TemperaturePoint(TimeSpan.Zero, Double.MinValue)
        Private ReadOnly minTemperaturePointField As TemperaturePoint = New TemperaturePoint(TimeSpan.MaxValue, Double.MaxValue)
        Private ReadOnly pointsField As List(Of TemperaturePoint) = New List(Of TemperaturePoint)(PointsCount)

        Friend ReadOnly Property MaxTemperaturePoint As TemperaturePoint
            Get
                Return maxTemperaturePointField
            End Get
        End Property

        Friend ReadOnly Property MinTemperaturePoint As TemperaturePoint
            Get
                Return minTemperaturePointField
            End Get
        End Property

        Friend ReadOnly Property OptimalTemperature As Double
            Get
                Return 53
            End Get
        End Property

        Friend ReadOnly Property Points As List(Of TemperaturePoint)
            Get
                Return pointsField
            End Get
        End Property

        Friend Sub New(ByVal random As Random)
            Dim preTemperature As Double = 50

            For i As Integer = 0 To PointsCount - 1
                Dim time As TimeSpan = TimeSpan.FromSeconds(i)
                Dim temperature As Double = preTemperature + (random.NextDouble() - 0.5) * 10
                If temperature > 90 Then temperature -= 20
                If temperature < 20 Then temperature += 10
                Dim temperaturePoint As TemperaturePoint = New TemperaturePoint(time, temperature)
                If temperature < minTemperaturePointField.Temperature Then minTemperaturePointField = temperaturePoint
                If temperature > maxTemperaturePointField.Temperature Then maxTemperaturePointField = temperaturePoint
                pointsField.Add(temperaturePoint)
                preTemperature = temperature
            Next
        End Sub
    End Class

    Public Class TemperaturePoint
        Private _TimeStamp As System.TimeSpan, _Temperature As Double

        Public Property TimeStamp As TimeSpan
            Get
                Return _TimeStamp
            End Get
            Private Set(ByVal value As TimeSpan)
                _TimeStamp = value
            End Set
        End Property

        Public Property Temperature As Double
            Get
                Return _Temperature
            End Get
            Private Set(ByVal value As Double)
                _Temperature = value
            End Set
        End Property

        Friend Sub New(ByVal time As TimeSpan, ByVal temperature As Double)
            TimeStamp = time
            Me.Temperature = temperature
        End Sub
    End Class
End Namespace