Series.Trendlines Property

Provides access to a collection of trendlines for the series.

Namespace: DevExpress.Spreadsheet.Charts

Assembly: DevExpress.Spreadsheet.v18.2.Core.dll

Declaration

C#

TrendlineCollection Trendlines { get; }

VB.NET

ReadOnly Property Trendlines As TrendlineCollection

Property Value

Type	Description
TrendlineCollection	A TrendlineCollection object that is the collection of all the Trendline objects for the series.

Remarks

The following code uses the TrendlineCollection.Add method to display a trendline of the ChartTrendlineType.Polynomial type.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/spreadsheet-document-server-chart-api-t132724

TrendlineActions.cs

Worksheet worksheet = workbook.Worksheets["chartTask3"];
workbook.Worksheets.ActiveWorksheet = worksheet;

// Create a chart and specify its location.
Chart chart = worksheet.Charts.Add(ChartType.ColumnStacked);
chart.SelectData(worksheet["C2:F3"], ChartDataDirection.Row);
chart.TopLeftCell = worksheet.Cells["H2"];
chart.BottomRightCell = worksheet.Cells["N14"];

// Show data labels.
chart.Views[0].DataLabels.ShowValue = true;

// Display a polynomial trendline.
chart.Series[0].Trendlines.Add(ChartTrendlineType.Polynomial);

TrendlineActions.vb

Dim worksheet As Worksheet = workbook.Worksheets("chartTask3")
workbook.Worksheets.ActiveWorksheet = worksheet

' Create a chart and specify its location.
Dim chart As Chart = worksheet.Charts.Add(ChartType.ColumnStacked)
chart.SelectData(worksheet("C2:F3"), ChartDataDirection.Row)
chart.TopLeftCell = worksheet.Cells("H2")
chart.BottomRightCell = worksheet.Cells("N14")

' Show data labels.
chart.Views(0).DataLabels.ShowValue = True

' Display a polynomial trendline.
chart.Series(0).Trendlines.Add(ChartTrendlineType.Polynomial)

The resulting chart is shown in the following picture.