ChartIndicatorBase.Value Property

Specifies the measure data item that is used to calculate the trend indicator.

Namespace: DevExpress.DashboardCommon

Assembly: DevExpress.Dashboard.v23.1.Core.dll

NuGet Packages: DevExpress.Dashboard.Core, DevExpress.Win.Dashboard.Design

Declaration

C#

[DefaultValue(null)]
public string Value { get; set; }

VB.NET

<DefaultValue(Nothing)>
Public Property Value As String

Property Value

Type	Default	Description
String	null	A data item’s ID that specifies the measure used to calculate the trend indicator.

Remarks

Use the DataItem.UniqueId property to get the data item’s ID.

The following example shows how to create a trend line at runtime:

C#

using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using DevExpress.DashboardCommon;

namespace WinForm {
    public partial class FormDesigner : Form {
        public FormDesigner() {
            InitializeComponent();
            var dashboard = new Dashboard1();
            ChartDashboardItem chartItem = dashboard.Items.First(x => x.ComponentName == "chartDashboardItem1") as ChartDashboardItem;
            ChartTrendLine trendline = new ChartTrendLine();
            SimpleSeries simpleSeries = chartItem.Panes[0].Series[0] as SimpleSeries;
            if (simpleSeries != null) {
                trendLine.Value = simpleSeries.Value.UniqueId;
            }
            trendline.Name = "Trend Indicator";
            trendline.ValueLevel = DevExpress.XtraCharts.ValueLevel.Value;
            trendline.LegendText = "Sales Trend";
            trendline.ShowInLegend = true;
            trendline.Color = Color.DarkGreen;

            chartItem.Indicators.Add(trendline);
            dashboardDesigner.Dashboard = dashboard;
            dashboardDesigner.CreateRibbon();
            dashboardDesigner.CreateCustomItemBars();
        }
    }   
} 

VB.NET

Imports System.Drawing
Imports System.Linq
Imports System.Windows.Forms
Imports DevExpress.DashboardCommon

Namespace WinForm
    Partial Public Class FormDesigner
        Inherits Form

        Public Sub New()
            InitializeComponent()
            Dim dashboard = New Dashboard1()
            Dim chartItem As ChartDashboardItem = TryCast(dashboard.Items.First(Function(x) x.ComponentName = "chartDashboardItem1"), ChartDashboardItem)
            Dim trendline As New ChartTrendLine()
            Dim simpleSeries As SimpleSeries = TryCast(chartItem.Panes(0).Series(0), SimpleSeries)
            If simpleSeries IsNot Nothing Then
                trendLine.Value = simpleSeries.Value.UniqueId
            End If
            trendline.Name = "Trend Indicator"
            trendline.ValueLevel = DevExpress.XtraCharts.ValueLevel.Value
            trendline.LegendText = "Sales Trend"
            trendline.ShowInLegend = True
            trendline.Color = Color.DarkGreen

            chartItem.Indicators.Add(trendline)
            dashboardDesigner.Dashboard = dashboard
            dashboardDesigner.CreateRibbon()
            dashboardDesigner.CreateCustomItemBars()
        End Sub
    End Class
End Namespace