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V24.1

DataMember Class

A data member that supplies data used to create series points.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v24.1.dll

NuGet Package: DevExpress.Charts

Declaration

[TypeConverter(typeof(LocalizableExpandableObjectTypeConverter))]
public class DataMember :
    INotifyPropertyChanged

Example

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

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;
        }
    }
}

Inheritance

Object
DataMember
See Also