Asp.Net完整实现网页保存为图片代码

　　需要把网页保存为图片，实现原理：在Web项目中引用System.Windows.Forms,使用WebBrowser嵌入任意网页，通过WebBrowser可以把网页截成图片流，再保存为各种图片格式就实现了。

　　注意：网页中有一些脚本不支持，只截取网页中的BODY，用XLST技术实现或其它相应的方式生生成的网页不支持。

　　代码如：

　　1.在WEB项目添加引用System.Windows.Forms。

　　2.添加类WebSiteThumbnail：

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 Epower.ITSM.Web.Common
{
    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();
            //_GenerateWebSiteThumbnailImage();
            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);
        }
    }
}

　　3.调用方法：

　　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);
            System.Drawing.Image postImage = System.Drawing.Image.FromStream(ms);
            postImage.Save("D:\\Test\\test.Png",System.Drawing.Imaging.ImageFormat.Png);