Generate charts, graphs in PDF using iTextSharp in ASP.NET Core - asp.net-core

Question

I need to generate a PDF document at the server side of a ASP.NET Core 3.1. I am using iTextSharp to generate PDF. I am able to create data tables in PDF using iTextSharp. However I am not able to find a solution to add charts or graphs into the PDF using the same library.
I have used ChartJS and other similar packages but none of them let me create a chart at the backend and create it as an image to be embedded in the PDF.

Answer 1

UPDATE 8/12/2020
Create excel then convert to pdf.
Essential XlsIO is a native .NET class librry that can be used to create and modify Microsoft Excel files.
XlsIO allows you to convert an entire workbook or a single worksheet into PDF document.
[Route("/chart")]
public IActionResult CreateChart()
{
using (ExcelEngine excelEngine = new ExcelEngine())
{
IApplication application = excelEngine.Excel;
application.DefaultVersion = ExcelVersion.Excel2013;
IWorkbook workbook = application.Workbooks.Create(1);
IWorksheet sheet = workbook.Worksheets[0];
//Inserts the sample data for the chart
sheet.Range["A1"].Text = "Month";
sheet.Range["B1"].Text = "Product A";
sheet.Range["C1"].Text = "Product B";
//Months
sheet.Range["A2"].Text = "Jan";
sheet.Range["A3"].Text = "Feb";
sheet.Range["A4"].Text = "Mar";
sheet.Range["A5"].Text = "Apr";
sheet.Range["A6"].Text = "May";
//Create a random Data
Random r = new Random();
for (int i = 2; i <= 6; i++)
{
for (int j = 2; j <= 3; j++)
{
sheet.Range[i, j].Number = r.Next(0, 500);
}
}
IChartShape chart = sheet.Charts.Add();
//Set chart type
chart.ChartType = ExcelChartType.Line;
//Set Chart Title
chart.ChartTitle = "Product Sales comparison";
//Set first serie
IChartSerie productA = chart.Series.Add("ProductA");
productA.Values = sheet.Range["B2:B6"];
productA.CategoryLabels = sheet.Range["A2:A6"];
//Set second serie
IChartSerie productB = chart.Series.Add("ProductB");
productB.Values = sheet.Range["C2:C6"];
productB.CategoryLabels = sheet.Range["A2:A6"];
//Saving the workbook as stream
//FileStream stream = new FileStream("Chart.xlsx", FileMode.Create, FileAccess.ReadWrite);
//workbook.SaveAs(stream);
//Initialize XlsIO renderer.
XlsIORenderer renderer = new XlsIORenderer();
//Convert Excel document into PDF document
Syncfusion.Pdf.PdfDocument pdfDocument = renderer.ConvertToPDF(sheet);
MemoryStream stream = new MemoryStream();
pdfDocument.Save(stream);
stream.Flush(); //Always catches me out
stream.Position = 0; //Not sure if this is required
//stream.Dispose();
return File(stream, "application/pdf", "chart.pdf");
}
}
Generate PDF with Image by using iTextsharp in ASPNET Core 3.1
Here are the codes of action.
[Route("/pdf")]
public FileStreamResult GeneratePDFwithImage()
{
var imagepath = System.IO.Path.Combine(_env.WebRootPath, "/images") + "/test.png";
Document doc = new Document();
MemoryStream stream = new MemoryStream();
PdfWriter pdfWriter = PdfWriter.GetInstance(doc, stream);
pdfWriter.CloseStream = false;
doc.Open();
doc.Add(new Paragraph("Hello World"));
Image png = Image.GetInstance(imagepath);
doc.Add(png);
doc.Close();
stream.Flush(); //Always catches me out
stream.Position = 0; //Not sure if this is required
return File(stream, "application/pdf", "HelloWorld.pdf");
}
Test of result