将动态生成的pdf附加到电子邮件c# .net网页

using System;
using System.Net.Mail;
using iTextSharp.text;
using iTextSharp.text.pdf;

// 生成PDF
Document document = new Document();
PdfWriter writer = PdfWriter.GetInstance(document, new System.IO.FileStream("path/to/generated.pdf", System.IO.FileMode.Create));
document.Open();
document.Add(new Paragraph("Hello, World!"));
document.Close();

// 创建电子邮件
MailMessage mail = new MailMessage();
mail.From = new MailAddress("sender@example.com");
mail.To.Add("recipient@example.com");
mail.Subject = "PDF Attachment";
mail.Body = "Please find the attached PDF.";

// 添加PDF附件
Attachment attachment = new Attachment("path/to/generated.pdf", "application/pdf");
mail.Attachments.Add(attachment);

// 发送电子邮件
SmtpClient smtpClient = new SmtpClient("smtp.example.com", 25);
smtpClient.Credentials = new System.Net.NetworkCredential("username", "password");
smtpClient.Send(mail);