一、实现方法

//WebSiteThumbnail.cs文件，在BS项目中需要添加对System.Windows.Forms的引用

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using System.Drawing;

using System.Threading;

using System.Windows.Forms;

namespace TestWebApp

{

    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);

        }

    }

}

二、调用方法

//在任意网页中的Page_Load事件时，加入如下代码：

        protected void Page_Load(object sender, EventArgs e)

        {

            Bitmap m_Bitmap = WebSiteThumbnail.GetWebSiteThumbnail("", 600, 600, 600, 600);

            MemoryStream ms = new MemoryStream();

            m_Bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Png);//JPG、GIF、PNG等均可

            byte[] buff = ms.ToArray();

            Response.BinaryWrite(buff);

       }