How to create Excel treemap chart in C#, VB.NET?

6 mins read

This article explains how to create a treemap chart in Excel using Excel (XlsIO) library.

What is a treemap chart?

Treemap provides a hierarchical view of data as clustered rectangle with a specific weighted attribute determining the size of the rectangle.

Create Treemap Chart in Excel

Treemap Chart

To create a treemap chart in Excel using XlsIO, you need to do the following steps.

Steps to create treemap chart:

Step 1: Initialize chart

Create a chart object by calling the worksheet.Charts.Add method and specify the chart type to ExcelChartType.TreeMap enum value.

            //Create the chart
            IChartShape chart = worksheet.Charts.Add();
 
            //Set chart type to TreeMap
            chart.ChartType = ExcelChartType.TreeMap;

Step 2: Assign data

Set a range of data from the worksheet to chart’s DataRange property. To plot the series values in column and categories in row, set chart’s IsSeriesInRows property to false.

            //Set region of Chart data
            chart.DataRange = worksheet["A2:C11"];
 
            //Set chart series in column for assigned data region
            chart.IsSeriesInRows = false;

Step 3: Apply basic chart elements

Add the basic elements like chart title, data labels and legend with the below list of properties.

ChartTitle of chart object.
Set DataLabels via DefaultDataPoint.
Set TRUE to chart’s HasLegend property, to show the legend.

              //Apply chart elements
              //Set Chart Title
              chart.ChartTitle = "Treemap Chart";
 
              //Set Legend
              chart.HasLegend = false;
              
              //Set Datalabels
              IChartSerie serie1 = chart.Series[0];
              serie1.DataPoints.DefaultDataPoint.DataLabels.IsCategoryName = true;

Applicable properties of treemap chart

Other property that is applicable for a treemap chart.

TreemapLabelOption (Datalabel values cannot be added to a treemap chart)
Note:
1)Applying other properties unrelated to this chart might throw exception or the changes will not be reflected in the output document because those properties are not related to treemap chart.

2)As treemap chart is introduced in MS Excel 2016, it can’t be viewed in MS Excel 2013 and its earlier versions.

Change the series fill color

The following code snippet explains how to change the fill color for a data point in the series.

//Change fill color for a data point
IChartSerie serie1 = chart.Series[0];
serie1.DataPoints[0].DataFormat.Fill.ForeColor = Color.Green;

The following code snippet explains how to change the fill color for entire series.

//Change fill color for entire series
IChartSerie serie1 = chart.Series[0];
serie1.SerieFormat.Fill.ForeColor = Color.Green;

Download Complete Sample

Download input file with data

To know more about creating charts with various settings using Syncfusion Excel (XlsIO) library, please refer the documentation.

The following C#/ VB.NET complete code snippet shows the creation of treemap chart using XlsIO.

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.TreeMap;
 
                //Assign data
                chart.DataRange = worksheet["A2:C11"];
                chart.IsSeriesInRows = false;
 
                //Apply chart elements
                //Set Chart Title
                chart.ChartTitle = "Treemap Chart";
 
                //Set Datalabels
                IChartSerie serie1 = chart.Series[0];
                serie1.DataPoints.DefaultDataPoint.DataLabels.IsCategoryName = true;
                serie1.SerieFormat.TreeMapLabelOption = ExcelTreeMapLabelOption.Overlapping;
 
                //Set Legend
                chart.HasLegend = false;
 
                //Positioning the chart in the worksheet
                chart.TopRow = 8;
                chart.LeftColumn = 1;
                chart.BottomRow = 23;
                chart.RightColumn = 8;
 
                //Saving and closing the workbook
                Stream stream = File.Create("Output.xlsx");
                workbook.SaveAs(stream);
            }
        }
    }
}

VB.NET

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.Treemap
 
            'Assign data
            chart.DataRange = worksheet("A2:C11")
            chart.IsSeriesInRows = False
 
            'Apply chart elements
            'Set Chart Title
            chart.ChartTitle = "Treemap Chart"
            'Set Datalabels
            Dim serie1 As IChartSerie = chart.Series(0)
            serie1.DataPoints.DefaultDataPoint.DataLabels.IsCategoryName = True
            serie1.SerieFormat.TreeMapLabelOption = ExcelTreeMapLabelOption.Overlapping
 
            'Set Legend
            chart.HasLegend = False
 
            'Positioning the chart in the worksheet
            chart.TopRow = 8
            chart.LeftColumn = 1
            chart.BottomRow = 23
            chart.RightColumn = 8
 
            'Saving and closing the workbook
            Dim stream As Stream = File.Create("Output.xlsx")
            workbook.SaveAs(stream)
        End Sub
    End Class
End Namespace

Conclusion

I hope you enjoyed learning about how to create Excel treemap chart in C#, VB.NET.

You can refer to our WinForms XIsIO’s feature tour page to know about its other groundbreaking feature representations. You can also explore our WinForms XIsIO documentation to understand how to present and manipulate data.

For current customers, you can check out our WinForms components from the License and Downloads page. If you are new to Syncfusion, you can try our 30-day free trial to check out our WinForms XIsIO and other WinForms components.

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