在Winforms中使用iTextSharp进行PDF合并

Question

我有我的pdf合并应用程序的代码，但我需要有关如何使其全部工作的帮助。我需要有关winforms设计的帮助。显然，它现在只是一个没有设计的空白屏幕。

在下面，您将看到我的表单代码，分别标记为form1.cs和下方的program.cs

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }
    }
}

form1.cs

using System;
using System.IO;
using System.Windows.Forms;
using iTextSharp.text;
using iTextSharp.text.pdf;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            //Folder that we'll work from
            string workingFolder = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
            string pdf1 = Path.Combine(workingFolder, "pdf1.pdf");//PDF with solid red background color
            string pdf2 = Path.Combine(workingFolder, "pdf2.pdf");//PDF with text
            string pdf3 = Path.Combine(workingFolder, "pdf3.pdf");//Merged PDF

            //Create a basic PDF filled with red, nothing special
            using (FileStream fs = new FileStream(pdf1, FileMode.Create, FileAccess.Write, FileShare.None))
            {
                using (Document doc = new Document(PageSize.LETTER))
                {
                    using (PdfWriter writer = PdfWriter.GetInstance(doc, fs))
                    {
                        doc.Open();
                        PdfContentByte cb = writer.DirectContent;
                        cb.SetColorFill(BaseColor.RED);
                        cb.Rectangle(0, 0, doc.PageSize.Width, doc.PageSize.Height);
                        cb.Fill();
                        doc.Close();
                    }
                }
            }

            //Create a basic PDF with a single line of text, nothing special
            using (FileStream fs = new FileStream(pdf2, FileMode.Create, FileAccess.Write, FileShare.None))
            {
                using (Document doc = new Document(PageSize.LETTER))
                {
                    using (PdfWriter writer = PdfWriter.GetInstance(doc, fs))
                    {
                        doc.Open();
                        doc.Add(new Paragraph("This is a test"));
                        doc.Close();
                    }
                }
            }

            //Create a basic PDF
            using (FileStream fs = new FileStream(pdf3, FileMode.Create, FileAccess.Write, FileShare.None))
            {
                using (Document doc = new Document(PageSize.LETTER))
                {
                    using (PdfWriter writer = PdfWriter.GetInstance(doc, fs))
                    {
                        doc.Open();

                        //Get page 1 of the first file
                        PdfImportedPage imp1 = writer.GetImportedPage(new PdfReader(pdf1), 1);
                        //Get page 2 of the second file
                        PdfImportedPage imp2 = writer.GetImportedPage(new PdfReader(pdf2), 1);
                        //Add the first file to coordinates 0,0
                        writer.DirectContent.AddTemplate(imp1, 0, 0);
                        //Since we don't call NewPage the next call will operate on the same page
                        writer.DirectContent.AddTemplate(imp2, 0, 0);
                        doc.Close();
                    }
                }
            }

            this.Close();
        }

        private void Form1_Load_1(object sender, EventArgs e)
        {

        }
    }
}

我希望输出是可以正常工作的Pdf合并/合并，其中有两个按钮要求为父pdf上载哪个文件，然后为子pdf另一个按钮，然后显示子pdf的内容合并到父pdf中