form_combo: Example code of Early Access iText-优快云博客

本文介绍如何使用iTextSharp库在C#中创建包含组合框的交互式PDF表单。通过实例展示了从创建文档到添加组合框字段的全过程，并将其保存为PDF文件。

using System;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.IO;
public class form_combo
{


    [STAThread]
    public static void  Main(string[] args)
    {
        Document document = new Document(PageSize.A4, 50, 50, 50, 50);
        try
        {
            // creation of the different writers
            PdfWriter writer = PdfWriter.GetInstance(document, new FileStream(@"e:\java\form_combo.Pdf", FileMode.Create));

            document.Open();
            PdfContentByte cb = writer.DirectContent;
            cb.MoveTo(0, 0);
            string[] options = new string[]{"Red", "Green", "Blue"};
            PdfFormField field = PdfFormField.CreateCombo(writer, true, options, 0);
            field.SetWidget(new Rectangle(100, 700, 180, 720), PdfAnnotation.HIGHLIGHT_INVERT);
            field.FieldName=("ACombo");
            field.ValueAsString=("Red");
            writer.AddAnnotation(field);
            document.Close();
            System.Console.Out.WriteLine("FIM.");
        }
        catch (System.Exception de)
        {
            System.Console.Error.WriteLine(de.Message);
        }
    }
}