How to create WinForms XlsIO doughnut chart in C#, VB.NET?
This article explains how to create a doughnut chart in Excel using the Syncfusion Excel (XlsIO) library.
What is a doughnut chart?
Just like a pie chart, a doughnut chart shows the relationship of parts to a whole, but a doughnut chart can contain more than one data series. Each data series that you plot in a doughnut chart adds a ring to the chart. The first data series is displayed in the center of the chart.
Doughnut Chart
To create a doughnut chart in Excel using XlsIO, you need to do the following steps.
Steps to create doughnut chart:
Step 1: Initialize chart
Create a chart object by calling the worksheet.Charts.Add method and specify the chart type to ExcelChartType.Doughnut enum value.
C#
// Create the chart IChartShape chart = worksheet.Charts.Add(); // Set chart type to Doughnut chart.ChartType = ExcelChartType.Doughnut;
Step 2: Assign data
Set a range of data from the worksheet to the chart’s DataRange property. To plot the series values in the column and categories in the row, set the chart’s IsSeriesInRows property to false.
C#
// Set region of Chart data chart.DataRange = worksheet["A2:C7"]; // 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.
- ChartTitle of chart object.
- Set DataLabels via DefaultDataPoint.
- Set TRUE to the chart’s HasLegend property, to show the legend.
C#
// Apply chart elements // Set Chart Title chart.ChartTitle = "Doughnut Chart"; // Set Legend chart.HasLegend = true; chart.Legend.Position = ExcelLegendPosition.Bottom; // Set DataLabels IChartSerie serie1 = chart.Series[0]; IChartSerie serie2 = chart.Series[1]; serie1.DataPoints.DefaultDataPoint.DataLabels.IsValue = true; serie2.DataPoints.DefaultDataPoint.DataLabels.IsValue = true;
Applicable Properties of doughnut chart
Below is the list of other properties that are applicable for a doughnut chart.
- Percent (Doughnut Explosion)
- First Slice Angle
- DoughnutHoleSize
- IsVaryColor (All slices are represented with the same color if IsVaryColor is FALSE)Note:
Applying properties apart from the mentioned list might throw an exception or the changes will not be reflected in the output document because those properties are not related to the doughnut chart.
To know more about creating charts with various settings using the Syncfusion® Excel (XlsIO) library, please refer to the documentation.
The following C#/ VB.NET complete code snippet shows the creation of a doughnut chart 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.Doughnut; // Assign data chart.DataRange = worksheet["A2:C7"]; chart.IsSeriesInRows = false; // Apply chart elements // Set Chart Title chart.ChartTitle = "Doughnut Chart"; // Set Legend chart.HasLegend = true; chart.Legend.Position = ExcelLegendPosition.Bottom; // Set DataLabels IChartSerie serie1 = chart.Series[0]; IChartSerie serie2 = chart.Series[1]; serie1.DataPoints.DefaultDataPoint.DataLabels.IsValue = true; serie2.DataPoints.DefaultDataPoint.DataLabels.IsValue = true; // 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.Doughnut 'Assign data chart.DataRange = worksheet("A2:C7") chart.IsSeriesInRows = False 'Apply chart elements 'Set Chart Title chart.ChartTitle = "Doughnut Chart" 'Set Legend chart.HasLegend = True chart.Legend.Position = ExcelLegendPosition.Bottom 'Set DataLabels IChartSerie serie1 = chart.Series[0] IChartSerie serie2 = chart.Series[1] serie1.DataPoints.DefaultDataPoint.DataLabels.IsValue = True serie2.DataPoints.DefaultDataPoint.DataLabels.IsValue = True 'Positioning 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 Using End Sub End Class End Namespace
Take a moment to peruse the documentation where you can find basic Excel document processing options along with the features like import and export data, chart, formulas, conditional formatting, data validation, tables, pivot tables and, protect the Excel documents, and most importantly, the PDF, CSV and Image conversions with code examples.
Conclusion
I hope you enjoyed learning about how to create WinForms XlsIO doughnut chart in C#, VB.NET.
You can refer to our XIsIO’s feature tour page to learn about its other groundbreaking features. Explore our UG documentation and online demos to understand how to manipulate data in Excel documents.
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