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("http://www.google.cn", 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);
       }