C# 将HTML转换为PDF

		private void btn_toPDF_Click(object sender, EventArgs e)
        {
            ConvertToImg();
        }

        WebBrowser webBrowser = null;
        
		/// <summary>
        /// 拼接HTML代码
        /// </summary>
        /// <returns></returns>
        public StringBuilder AppendStr()
        {
            StringBuilder str = new StringBuilder();
            str.Append("<table border=\"1\" cellspacing=\"0\">");
            str.Append("<tr>");
            str.Append("<th>姓名</th>");
            str.Append("<th>年龄</th>");
            str.Append("<th>性别</th>");
            str.Append("<th>职业</th>");
            str.Append("<th>爱好</th>");
            str.Append("<th>住址</th>");
            str.Append("</tr>");
            str.Append("<tr>");
            str.Append("<td>张三</td>");
            str.Append("<td>24</td>");
            str.Append("<td>男</td>");
            str.Append("<td>程序员</td>");
            str.Append("<td>无</td>");
            str.Append("<td>黄埔区</td>");
            str.Append("</tr>");
            str.Append("<tr>");
            str.Append("<td>李四</td>");
            str.Append("<td>23</td>");
            str.Append("<td>女</td>");
            str.Append("<td>程序员</td>");
            str.Append("<td>肖战</td>");
            str.Append("<td>天河区</td>");
            str.Append("</tr>");
            str.Append("</table>");
            return str;
        }
        public void ConvertToImg()
        {
            StringBuilder html = AppendStr();

            webBrowser = new WebBrowser();
            //是否显式滚动条
            webBrowser.ScrollBarsEnabled = false;
            //加载 html
            webBrowser.DocumentText =Convert.ToString(html);
            //页面加载完成执行事件
            webBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(webBrowser_DocumentCompleted);
        }

        private void webBrowser_DocumentCompleted(object sender, EventArgs e)//这个就是当网页载入完毕后要进行的操作
        {
            //获取解析后HTML的大小
            System.Drawing.Rectangle rectangle = webBrowser.Document.Body.ScrollRectangle;
            int width = rectangle.Width;//rectangle.Width
            int height = rectangle.Height;//rectangle.Height

            //设置解析后HTML的可视区域
            webBrowser.Width = width;
            webBrowser.Height = height;
            Bitmap bitmap = new Bitmap(width, height);
            webBrowser.DrawToBitmap(bitmap, new System.Drawing.Rectangle(0, 0, width, height));

            //设置图片文件保存路径和图片格式，格式可以自定义
            string filePath = AppDomain.CurrentDomain.BaseDirectory + "../../../SaveFile/" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".png";
            bitmap.Save(filePath, System.Drawing.Imaging.ImageFormat.Png);

            //创建PDF
            FileStream fileStream = new FileStream(AppDomain.CurrentDomain.BaseDirectory + "../../../SaveFile/" + DateTime.Now.ToString("yyyyMMddHHmmssfff") + ".pdf", FileMode.Create);

            byte[] result = CreatePDF(bitmap, width, height);
            fileStream.Write(result, 0, result.Length);
            fileStream.Close();
            fileStream.Dispose();
        }

        public byte[] CreatePDF(Bitmap bitmap, int width, int height)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                Document doc = new Document(new iTextSharp.text.Rectangle(0, 0, width, height), 3, 3, 3, 3);    // 左右上下
                PdfWriter writer = PdfWriter.GetInstance(doc, ms);
                writer.CloseStream = false;
                doc.Open();
                iTextSharp.text.Image img = iTextSharp.text.Image.GetInstance(bitmap, System.Drawing.Imaging.ImageFormat.Png);
                img.ScalePercent(100);      // 放缩比例
                doc.Add(img);       // 添加图片对像
                doc.Close();
                return ms.ToArray();
            }
        }

原文地址：https://blog.youkuaiyun.com/slowlifes/article/details/72940116?locationNum=4&fps=1