根据浏览器截图

//读取网页生成IMG    public class WebSiteThumbnail    {        Bitmap m_Bitmap;        string m_Url;        int m_BrowserWidth, m_BrowserHeight, m_ThumbnailWidth, m_ThumbnailHeight;        public WebSiteThumbnail(string Url, int BrowserWidth, int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight)        {            m_Url = Url;            m_BrowserHeight = BrowserHeight;            m_BrowserWidth = BrowserWidth;            m_ThumbnailWidth = ThumbnailWidth;            m_ThumbnailHeight = ThumbnailHeight;        }        public static Bitmap GetWebSiteThumbnail(string Url, int BrowserWidth, int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight)        {            WebSiteThumbnail thumbnailGenerator = new WebSiteThumbnail(Url, BrowserWidth, BrowserHeight, ThumbnailWidth, ThumbnailHeight);            return thumbnailGenerator.GenerateWebSiteThumbnailImage();        }        public Bitmap GenerateWebSiteThumbnailImage()        {            Thread m_thread = new Thread(new ThreadStart(_GenerateWebSiteThumbnailImage));            m_thread.SetApartmentState(ApartmentState.STA);            m_thread.Start();            m_thread.Join();            return m_Bitmap;        }        private void _GenerateWebSiteThumbnailImage()        {            WebBrowser m_WebBrowser = new WebBrowser();            m_WebBrowser.ScrollBarsEnabled = false;            m_WebBrowser.Navigate(m_Url);            m_WebBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(WebBrowser_DocumentCompleted);            while (m_WebBrowser.ReadyState != WebBrowserReadyState.Complete)                Application.DoEvents();            m_WebBrowser.Dispose();        }        private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)        {            WebBrowser m_WebBrowser = (WebBrowser)sender;            m_WebBrowser.ClientSize = new Size(this.m_BrowserWidth, this.m_BrowserHeight);            m_WebBrowser.ScrollBarsEnabled = false;            m_Bitmap = new Bitmap(m_WebBrowser.Bounds.Width, m_WebBrowser.Bounds.Height);            m_WebBrowser.BringToFront();            m_WebBrowser.DrawToBitmap(m_Bitmap, m_WebBrowser.Bounds);            m_Bitmap = (Bitmap)m_Bitmap.GetThumbnailImage(m_ThumbnailWidth, m_ThumbnailHeight, null, IntPtr.Zero);        }//调用方法 public void HtmlToImage(string url,string savePath)    {        string nowDate = DateTime.Now.ToString("yyyyMMddhhmmss");        Bitmap m_Bitmap = WebSiteThumbnail.GetWebSiteThumbnail(url, 390, 400, 590, 600);        MemoryStream ms = new MemoryStream();        m_Bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);//JPG、GIF、PNG等均可 bmp和png清晰度高，bmp几乎不压缩         byte[] buff = ms.ToArray();        System.Drawing.Image.FromStream(ms).Save(System.Web.HttpContext.Current.Server.MapPath(savePath));//"~/Manage/UpFile/Images/" + nowDate + ".JPG"        ms.Dispose();    }