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How to set trendlines for Excel chart series in C#, VB.NET?

Platform: WinForms |
Control: XlsIO

This article explains how to set trendlines for chart series using .NET XlsIO.

How to set trendlines for chart series?

A trendline is always associated with a data series, but a trendline does not represent the data of that data series. Instead, a trendline is used to depict trends in your existing data or forecasts of future data.

Methods to add trendline for the chart series

Overloaded Method 1: Adding the trendline with no parameters. Default, trendline type is linear.

//Set trendlines for chart series
IChartTrendLine trendline = serie1.TrendLines.Add();
trendline.Type = ExcelTrendLineType.Polynomial;
trendline.Order = 3;

 

Overloaded Method 2: Adding the trendline with passing ExcelTrendlineType parameter.

//Set trendlines for chart series
IChartTrendLine trendline = serie1.TrendLines.Add(ExcelTrendLineType.Polynomial);
trendline.Order = 3;

 

To format the trendlines please refer the IChartTrendline trendline properties link.

Download Complete Sample

 

Download input file with data

 

To know more about creating charts with various settings using XlsIO, please refer the documentation.

 

The following C#/ VB.NET complete code snippet shows how to set trendline for chart series using XlsIO.

 

C#

 

using Syncfusion.XlsIO;
using System.Reflection;
using System.IO;
 
namespace ChartSample
{
    class Program
    {
        static void Main(string[] args)
        {
            using (ExcelEngine excelEngine = new ExcelEngine())
            {
                IApplication application = excelEngine.Excel;
                application.DefaultVersion = ExcelVersion.Excel2016;
 
                //Open existing workbook with data entered
                Assembly assembly = typeof(Program).GetTypeInfo().Assembly;
                Stream fileStream = assembly.GetManifestResourceStream("ChartSample.InputTemplate.xlsx");
                IWorkbook workbook = application.Workbooks.Open(fileStream);
                IWorksheet worksheet = workbook.Worksheets[0];
 
                //Initialize chart
                IChartShape chart = worksheet.Charts.Add();
                chart.ChartType = ExcelChartType.Column_Clustered;
 
                //Assign data
                chart.DataRange = worksheet["A1:D6"];
                chart.IsSeriesInRows = false;
 
                //Apply chart elements
                //Set chart title
                chart.ChartTitle = "Clustered Column Chart";
                
                //Set data labels
                IChartSerie serie1 = chart.Series[0];
                IChartSerie serie2 = chart.Series[1];
                IChartSerie serie3 = chart.Series[2];
 
                serie1.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
                serie2.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
                serie3.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
 
                //Set trendlines for chart series
                //Add trendline
                IChartTrendLine trendline = serie2.TrendLines.Add();
                //Set trendline type
                trendline.Type = ExcelTrendLineType.Polynomial;
                //Set order for trendline
                trendline.Order = 3;
 
                //Positioning the chart in the worksheet
                chart.TopRow = 8;
                chart.LeftColumn = 1;
                chart.BottomRow = 23;
                chart.RightColumn = 8;
 
                //Saving the workbook
                Stream stream = File.Create("Output.xlsx");
                workbook.SaveAs(stream);
            }
        }
    }
}

VB

Imports Syncfusion.XlsIO
Imports System.Reflection
Imports System.IO
 
Namespace ChartSample
 
    Class Program
 
        Public Shared Sub Main(ByVal args() As String)
            Using excelEngine As ExcelEngine = New ExcelEngine
                Dim application As IApplication = excelEngine.Excel
                application.DefaultVersion = ExcelVersion.Excel2016
 
                'Open existing workbook with data entered
                Dim assembly As Assembly = GetType(Program).GetTypeInfo.Assembly
                Dim fileStream As Stream = assembly.GetManifestResourceStream("ChartSample.InputTemplate.xlsx")
                Dim workbook As IWorkbook = application.Workbooks.Open(fileStream)
                Dim worksheet As IWorksheet = workbook.Worksheets(0)
 
                'Initialize chart
                Dim chart As IChartShape = worksheet.Charts.Add
                chart.ChartType = ExcelChartType.Column_Clustered
 
                'Assign data
                chart.DataRange = worksheet("A1:D6")
                chart.IsSeriesInRows = False
 
                'Apply chart elements
                'Set chart title
                chart.ChartTitle = "Clustered Column Chart"
 
                'Set data labels
                Dim serie1 As IChartSerie = chart.Series(0)
                Dim serie2 As IChartSerie = chart.Series(1)
                Dim serie3 As IChartSerie = chart.Series(2)
 
                serie1.DataPoints.DefaultDataPoint.DataLabels.IsValue = True
                serie2.DataPoints.DefaultDataPoint.DataLabels.IsValue = True
                serie3.DataPoints.DefaultDataPoint.DataLabels.IsValue = True
 
                'Set trendlines for chart series
                'Add trendline
                Dim trendline As IChartTrendLine = serie1.TrendLines.Add
                'Set trendline type
                trendline.Type = ExcelTrendLineType.Polynomial
                'Set trendline order
                trendline.Order = 3
 
                'Positioning the chart in the worksheet
                chart.TopRow = 8
                chart.LeftColumn = 1
                chart.BottomRow = 23
                chart.RightColumn = 8
 
                'Saving the workbook
                Dim stream As Stream = File.Create("Output.xlsx")
                workbook.SaveAs(stream)
            End Using
        End Sub
    End Class
End Namespace

 

Polynomial trendline with order 3 set to chart series using XlsIO

  Polynomial trendline with order 3 set to chart series using XlsIO

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