如何将 itextsharp Html 中的标题图像应用到 pdf 转换器

Question

请给我任何解决方案；我正在使用此代码：

 HeaderFooter header = new HeaderFooter(new Phrase("This is a header"), false);
 document.Header = header;

但是发生了这个错误：

CS0246：
找不到类型或命名空间名称“HeaderFooter”（您是 缺少 using 指令或程序集引用？

Answer 1

那个代码是deprecated and removed many years ago，但不幸的是仍然存在于源代码中的 cmets 中。

您要做的是继承iTextSharp.text.pdf.PdfPageEventHelper 类并处理OnEndPage 方法，该方法将为文档中的每一页调用一次：

public class MyPageEventHandler : iTextSharp.text.pdf.PdfPageEventHelper {
    public override void OnEndPage(PdfWriter writer, Document document) {
        //Create a simple ColumnText object
        var CT = new ColumnText(writer.DirectContent);
        //Bind it to the top of the document but take up the entire page width
        CT.SetSimpleColumn(0, document.PageSize.Height - 20, document.PageSize.Width, document.PageSize.Height);
        //Add some text
        CT.AddText(new Phrase("This is a test"));
        //Draw our ColumnText object
        CT.Go();
    }
}

要使用它，您只需将它的一个新实例绑定到您的 PdfWriter 的 PageEvent 属性：

writer.PageEvent = new MyPageEventHandler();

以下是针对 iTextSharp 5.1.2.0 的完整工作 C# 2010 WinForms 应用程序，它显示了这一点：

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) {
            //Test file to create
            string outputFile = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Test.pdf");
            //Standard PDF file stream creation
            using (FileStream output = new FileStream(outputFile, FileMode.Create,FileAccess.Write,FileShare.None)){
                using (Document document = new Document(PageSize.LETTER)) {
                    using (PdfWriter writer = PdfWriter.GetInstance(document, output)) {

                        //Bind our custom event handler to the PdfWriter
                        writer.PageEvent = new MyPageEventHandler();
                        //Open our PDF for writing
                        document.Open();

                        //Add some text to page 1
                        document.Add(new Paragraph("This is page 1"));
                        //Add a new page
                        document.NewPage();
                        //Add some text to page 2
                        document.Add(new Paragraph("This is page 2"));

                        //Close the PDF
                        document.Close();
                    }
                }
            }

            this.Close();
        }
    }
    public class MyPageEventHandler : iTextSharp.text.pdf.PdfPageEventHelper {
        public override void OnEndPage(PdfWriter writer, Document document) {
            //Create a simple ColumnText object
            var CT = new ColumnText(writer.DirectContent);
            //Bind it to the top of the document but take up the entire page width
            CT.SetSimpleColumn(0, document.PageSize.Height - 20, document.PageSize.Width, document.PageSize.Height);
            //Add some text
            CT.AddText(new Phrase("This is a test"));
            //Draw our ColumnText object
            CT.Go();
        }
    }
}