获取html网页截图封装类 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;using System.IO;using System.Drawing.Imaging; namespace Utility{    public class WebSiteThumbnail    {        Bitmap m_Bitmap;        string m_Url; string m_Body;        bool m_IsAutoHeight = false;        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 WebSiteThumbnail(string Body, int Width)        {            m_IsAutoHeight = true;            m_Body = Body;                       m_BrowserWidth = Width;            m_ThumbnailWidth = Width;                   }*/        public WebSiteThumbnail(string Url, int Width)        {            m_IsAutoHeight = true;            m_Url = Url;            m_BrowserWidth = Width;            m_ThumbnailWidth = Width;        }        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 static void GetWebSiteThumbnailToWeb(string Body, int Width)        {                      WebSiteThumbnail thumbnailGenerator = new WebSiteThumbnail(Body, Width);            Bitmap m_Bitmap = thumbnailGenerator.GenerateWebSiteThumbnailImage();            System.Web.HttpContext.Current.Response.Clear();            System.Web.HttpContext.Current.Response.BufferOutput = true;            System.Web.HttpContext.Current.Response.ContentType = "image/jpeg";            //System.Web.HttpContext.Current.Response.AddHeader("Connection", "keep-alive");            m_Bitmap.Save(System.Web.HttpContext.Current.Response.OutputStream, ImageFormat.Jpeg);//保存到输出流中);                                            System.Web.HttpContext.Current.Response.Flush();            m_Bitmap.Dispose();            System.Web.HttpContext.Current.Response.End();        }*/        public static void GetWebSiteThumbnailToWeb(string Url, int Width)        {            WebSiteThumbnail thumbnailGenerator = new WebSiteThumbnail(Url, Width);            Bitmap m_Bitmap = thumbnailGenerator.GenerateWebSiteThumbnailImage();            System.Web.HttpContext.Current.Response.Clear();            System.Web.HttpContext.Current.Response.BufferOutput = true;            System.Web.HttpContext.Current.Response.ContentType = "image/jpeg";            //System.Web.HttpContext.Current.Response.AddHeader("Connection", "keep-alive");            m_Bitmap.Save(System.Web.HttpContext.Current.Response.OutputStream, ImageFormat.Jpeg);//保存到输出流中);                      System.Web.HttpContext.Current.Response.Flush();            m_Bitmap.Dispose();            //System.Web.HttpContext.Current.Response.End();        }        public static Bitmap GetWebSiteThumbnail(string Url, int Width)        {            WebSiteThumbnail thumbnailGenerator = new WebSiteThumbnail(Url, Width);            Bitmap m_Bitmap = thumbnailGenerator.GenerateWebSiteThumbnailImage();            return m_Bitmap;        }        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;                       //if (!string.IsNullOrWhiteSpace(m_Body))            //{            //    m_WebBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(WebBrowser_DocumentCompleted);            //    m_WebBrowser.Navigate("about:blank");            //    m_WebBrowser.Document.Write(m_Body);            //    m_WebBrowser.Url = m_WebBrowser.Url;                         //    //WebBrowser_DocumentCompleted(m_WebBrowser, null);            //}            //else            //{            m_WebBrowser.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(WebBrowser_DocumentCompleted);            m_WebBrowser.Navigate(m_Url);                       while (m_WebBrowser.ReadyState != WebBrowserReadyState.Complete)                Application.DoEvents();                            //}            m_WebBrowser.Dispose();        }        private void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)        {            WebBrowser m_WebBrowser = (WebBrowser)sender;                        if (m_IsAutoHeight)            {                this.m_BrowserHeight = 2000;                m_WebBrowser.ClientSize = new Size(this.m_BrowserWidth, this.m_BrowserHeight);                // 获取网页高度和宽度,也可以自己设置                int height = m_WebBrowser.Document.Body.ScrollRectangle.Height;                int width = m_WebBrowser.Document.Body.ScrollRectangle.Width;                     // 调节webBrowser的高度和宽度                m_WebBrowser.Height = height;                //m_WebBrowser.Width = width;                m_ThumbnailHeight = height;            }            else                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);                    }                        /// <summary>        /// 图片写到web        /// </summary>        /// <param name="bmp"></param>        public static void BitmapToWeb(Bitmap bmp)        {            Bitmap m_Bitmap = bmp;            System.Web.HttpContext.Current.Response.Clear();            System.Web.HttpContext.Current.Response.BufferOutput = true;            System.Web.HttpContext.Current.Response.ContentType = "image/jpeg";            m_Bitmap.Save(System.Web.HttpContext.Current.Response.OutputStream, ImageFormat.Jpeg);            System.Web.HttpContext.Current.Response.Flush();            m_Bitmap.Dispose();        }    }  }