TrendlineCollection.Add

Add(TrendlineType)

Adds a Trendline object to this collection with specified type.

public int Add(TrendlineType type)
ParameterTypeDescription
typeTrendlineTypeTrendline type.

Return Value

Trendline object index.

Examples

using System;
using Aspose.Cells;
using Aspose.Cells.Charts;

namespace AsposeCellsExamples
{
    public class TrendlineCollectionMethodAddWithTrendlineTypeDemo
    {
        public static void Run()
        {
            // Create a new workbook
            Workbook workbook = new Workbook();
            Worksheet worksheet = workbook.Worksheets[0];

            // Add sample data for chart
            worksheet.Cells["A1"].PutValue("X");
            worksheet.Cells["A2"].PutValue(1);
            worksheet.Cells["A3"].PutValue(2);
            worksheet.Cells["A4"].PutValue(3);
            worksheet.Cells["B1"].PutValue("Y");
            worksheet.Cells["B2"].PutValue(2);
            worksheet.Cells["B3"].PutValue(4);
            worksheet.Cells["B4"].PutValue(8);

            // Add a chart
            int chartIndex = worksheet.Charts.Add(ChartType.Line, 5, 0, 20, 8);
            Chart chart = worksheet.Charts[chartIndex];

            // Add series data
            chart.NSeries.Add("B2:B4", true);
            chart.NSeries.CategoryData = "A2:A4";

            // Add exponential trendline to the first series
            chart.NSeries[0].TrendLines.Add(TrendlineType.Exponential);

            // Save the workbook
            workbook.Save("TrendlineCollectionMethodAddWithTrendlineTypeDemo.xlsx");
        }
    }
}

See Also

Add(TrendlineType, string)

Adds a Trendline object to this collection with specified type and name.

public int Add(TrendlineType type, string name)
ParameterTypeDescription
typeTrendlineTypeTrendline type.
nameStringTrendline name.

Return Value

Trendline object index.

Examples

using System;
using Aspose.Cells;
using Aspose.Cells.Charts;

namespace AsposeCellsExamples
{
    public class TrendlineCollectionMethodAddWithTrendlineTypeStringDemo
    {
        public static void Run()
        {
            Workbook workbook = new Workbook();
            Worksheet sheet = workbook.Worksheets[0];
            
            // Add sample data
            sheet.Cells["A1"].PutValue("X Values");
            sheet.Cells["B1"].PutValue("Y Values");
            for (int i = 2; i <= 10; i++)
            {
                sheet.Cells["A" + i].PutValue(i);
                sheet.Cells["B" + i].PutValue(i * 2);
            }

            // Create chart
            int chartIndex = sheet.Charts.Add(ChartType.Scatter, 5, 0, 20, 10);
            Chart chart = sheet.Charts[chartIndex];

            // Add series and set data
            chart.NSeries.Add("B2:B10", true);
            chart.NSeries[0].XValues = "A2:A10";
            chart.NSeries[0].Name = "Data Series";

            // Add trendline with TrendlineType and name
            chart.NSeries[0].TrendLines.Add(TrendlineType.Logarithmic, "Logarithmic Trend");
            
            // Set some trendline properties
            Trendline trendline = chart.NSeries[0].TrendLines[0];
            trendline.DisplayEquation = true;
            trendline.DisplayRSquared = true;
            
            workbook.Save("TrendlineDemo.xlsx");
        }
    }
}

See Also