iTextSharp の利点が何であるかはわかりませんが、PDFSharp を使用してこれまで完全に機能しているソリューションを見つけました! ドキュメントはPDFSharpのライトサイドに少しあるように見えるので、このスレッドも非常に役立つことがわかりました...
これが誰かを助けるなら、ここに私のサンプルプログラムがあります:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using PdfSharp.Fonts;
using PdfSharp.Pdf;
using PdfSharp.Pdf.IO;
using PdfSharp.Pdf.AcroForms;
namespace PDFSharpTest
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void goButton_Click(object sender, EventArgs e)
{
//TestPDF(); //uncomment this to find out whether acroform will work correctly
//open file
PdfDocument pdf = PdfReader.Open(@"YOURFILEPATHandNAME", PdfDocumentOpenMode.Modify);
//fix some odd setting where filled fields don't always show SetupPDF(pdf);
//find and fill fields
PdfTextField txtEmployerName = (PdfTextField)(pdf.AcroForm.Fields["txtEmployerName"]);
txtEmployerName.Value = new PdfString("My Name");
PdfTextField txtEmployeeTitle = (PdfTextField)(pdf.AcroForm.Fields["txtEmployeeTitle"]);
txtEmployeeTitle.Value = new PdfString("Workin'");
PdfCheckBoxField chxAttached = (PdfCheckBoxField)(pdf.AcroForm.Fields["chxAttached"]);
chxAttached.Checked = true;
//save file
pdf.Save(@"NEWFILEPATHandNAMEHERE");
}
private void SetupPDF(PdfDocument pdf)
{
if (pdf.AcroForm.Elements.ContainsKey("/NeedAppearances") == false)
{
pdf.AcroForm.Elements.Add("/NeedAppearances", new PdfSharp.Pdf.PdfBoolean(true));
}
else
{
pdf.AcroForm.Elements["/NeedAppearances"] = new PdfSharp.Pdf.PdfBoolean(true);
}
}
private void PDFTest()
{
OpenFileDialog ofd = new OpenFileDialog();
if (ofd.ShowDialog() == DialogResult.OK)
{
PdfDocument _document = null;
try { _document = PdfReader.Open(ofd.FileName, PdfDocumentOpenMode.Modify); }
catch (Exception ex)
{
MessageBox.Show(ex.Message, "FATAL"); //do any cleanup and return
return;
}
if (_document != null)
{
if (_document.AcroForm != null)
{
MessageBox.Show("Acroform is object", "SUCCEEDED");
//pass acroform to some function for processing
_document.Save(@"C:\temp\newcopy.pdf");
}
else
{
MessageBox.Show("Acroform is null", "FAILED");
}
}
else
{
MessageBox.Show("Unknown error opening document", "FAILED");
}
}
}
}
}