如何使用 Itext7 C#.net 在 pdf 上创建复选框

Question

I am very new to c# and trying to implement a check-box inside a pdf using itext7. I am trying to use the documentation but keep getting error that "PdfButtonFormField in explicit interface declaration is not an interface"

virtual iText.Forms.Fields.PdfButtonFormField iText.Forms.Fields.PdfButtonFormField.SetRadiosInUnison   (bool radiosInUnison)

anyone can help me please to understand how to create the checkbox? thank you

Answer 1

Use the PdfFormField class to get a checkbox

PdfButtonFormField checkBox = PdfFormField.CreateCheckBox(pdf, new Rectangle(524, 600, 16, 16), "UsersNo", "Off", PdfFormField.TYPE_CHECK);

Full implementation to create a PDF file with just a single checkbox:

using iText.Forms;
using iText.Forms.Fields;
using iText.Kernel.Geom;
using iText.Kernel.Pdf;
using iText.Layout;

PdfWriter writer = new PdfWriter("demo.pdf");
PdfDocument pdf = new PdfDocument(writer);
Document document = new Document(pdf);

PdfButtonFormField checkBox = PdfFormField.CreateCheckBox(pdf, new Rectangle(524, 600, 16, 16), "UsersNo", "Off", PdfFormField.TYPE_CHECK);
var form = PdfAcroForm.GetAcroForm(pdf, true);
form.AddField(checkBox);
document.Close();