c# 如何实现web打印插件

          /// <summary>
          /// ConnAndListen
          /// </summary>
          public static void ConnAndListen()
          {              // 监听本地 45000端口
              var server = new WebSocketServer($"ws://127.0.0.1:45000");
              server.Start(socket =>
             {
                 socket.OnOpen = () =>
                 {
                     // 连接成功
                     socket.Send("socket通讯已连接");
                 };
                 socket.OnClose = () =>
                 {
                     // 关闭连接
                     socket.Send("socket通讯已关闭连接");
                     socket.Close();
                 };
                 socket.OnMessage = message =>
                 {
                     // TODO...
                 };
             });
         }

/// <summary>
        /// GetBitmap
        /// </summary>
        /// <returns></returns>
        public Bitmap GetBitmap()
        {
            WebPageBitmap Shot = new WebPageBitmap("html", "页面宽度", "页面高度");
            Shot.GetIt();
            Bitmap Pic = Shot.DrawBitmap("图片高度", "图片宽度");
            // 设置图片分辨率
            Pic.SetResolution(203.0F, 203.0F);
            return Pic;
        }

/// <summary>
    /// 图片打印
    /// </summary>
    public class PrintDirectClass
    {
        private PaperSize paperSize = null;
        // 多页打印
        private int printNum = 0;
        // 单个图片文件
        private string imageFile = ".....";
        // 多个图片文件
        private ArrayList imageList = new ArrayList();

        /// <summary>
        /// 打印预览
        /// </summary>
        public void PrintPreview()
        {
            // 打印机对象
            PrintDocument imgToPrint = new PrintDocument();

            #region 打印机相关设置
            var pageSize = imgToPrint.PrinterSettings.PaperSizes;
            paperSize = pageSize[pageSize.Count - 1];

            // 打印方向设置
            //imgToPrint.DefaultPageSettings.Landscape = false;
            // 打印纸张大小设置
            //imgToPrint.DefaultPageSettings.PaperSize = paperSize;
            // 打印分辨率设置
            //imgToPrint.DefaultPageSettings.PrinterResolution.Kind = PrinterResolutionKind.High;
            // 打印边距设置
            //imgToPrint.DefaultPageSettings.Margins = new Margins(40, 40, 40, 40);

            // 打印开始事件
            imgToPrint.BeginPrint += new PrintEventHandler(this.imgToPrint_BeginPrint);
            // 打印结束事件
            imgToPrint.EndPrint += new PrintEventHandler(this.imgToPrint_EndPrint);
            // 打印内容设置
            imgToPrint.PrintPage += new PrintPageEventHandler(this.imgToPrint_PrintPage);
            #endregion

            // 直接打印
            //imgToPrint.Print();

            // 打印弹框确认
            //PrintDialog printDialog = new PrintDialog();
            //printDialog.AllowSomePages = true;
            //printDialog.ShowHelp = true;
            //printDialog.Document = imgToPrint;
            //if (printDialog.ShowDialog() == DialogResult.OK)
            //{
            //    imgToPrint.Print();
            //}

            // 预览打印
            //PrintPreviewDialog pvDialog = new PrintPreviewDialog();
            //pvDialog.Document = imgToPrint;
            //pvDialog.ShowDialog();
        }

        /// <summary>
        /// 打印开始事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void imgToPrint_BeginPrint(object sender, PrintEventArgs e)
        {
            if (imageList.Count == 0)
                imageList.Add(imageFile);
        }

        /// <summary>
        /// 打印结束事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void imgToPrint_EndPrint(object sender, PrintEventArgs e)
        {

        }

        /// <summary>
        /// 设置打印内容
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void imgToPrint_PrintPage(object sender, PrintPageEventArgs e)
        {
            // 图片文本质量
            e.Graphics.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
            // 图片插值质量
            e.Graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
            // 图片合成质量
            e.Graphics.CompositingQuality = CompositingQuality.HighQuality;
            // 图片抗锯齿
            e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
            // 设置缩放比例
            e.Graphics.PageScale = 0.3F;
            using (Stream fs = new FileStream(imageList[printNum].ToString().Trim(), FileMode.Open, FileAccess.Read))
            {
                System.Drawing.Image image = System.Drawing.Image.FromStream(fs);
                int w = image.Width;
                int h = image.Height;
                // 绘制Image
                e.Graphics.DrawImage(image, 40, 40, 410, 600);
                if (printNum < imageList.Count - 1)
                {
                    printNum++;
                    // HasMorePages为true则再次运行PrintPage事件
                    e.HasMorePages = true;
                    return;
                }
                e.HasMorePages = false;
            }
            // 设置打印内容的边距
            //e.PageSettings.Margins = new Margins(40, 40, 40, 40);
            // 设置是否横向打印
            e.PageSettings.Landscape = false;
            // 设置纸张大小
            e.PageSettings.PaperSize = paperSize;
            // 设置打印分辨率
            e.PageSettings.PrinterResolution.Kind = PrinterResolutionKind.High;
        }
    }

WebBrowser wb = new WebBrowser();
            // 直接打印
            wb.Print();
            // 确认打印
            wb.ShowPrintDialog();
            // 预览打印
            wb.ShowPrintPreviewDialog();

//转到某个网址
webBrowser.Navigate("");
//直接打印
 webBrowser.Print();
 //预览
 webBrowser.ShowPrintPreviewDialog();
 //打印
 webBrowser.ShowPrintDialog();