C#实现在网页中根据url截图并输出到网页的方法

using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;using System.Threading;using System.Windows.Forms;using System.Drawing;using System.IO;/// <summary>/// This page show the way of generate a image in website/// </summary>public partial class Default2 : System.Web.UI.Page{  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);  }}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);  }}