C# 模拟网站登陆并截图

        private void button1_Click(object sender, EventArgs e)
        {
            Bitmap m_Bitmap = WebSiteThumbnail.GetWebSiteThumbnail("http://192.168.0.106:1452/", 600, 300, 600, 600);
            //保存图片 JPG、GIF、PNG等均可
            m_Bitmap.Save("F:/Image/" + DateTime.Now.Year.ToString()
                + DateTime.Now.Month.ToString()
                + DateTime.Now.Day.ToString()
                 + DateTime.Now.Hour.ToString()
                  + DateTime.Now.Minute.ToString() + DateTime.Now.Second.ToString() + DateTime.Now.Millisecond.ToString()
                + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
        }

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;
            //获取网页文档对象，相当于获取网页的全部源码
            HtmlDocument htmlDoc = m_WebBrowser.Document;
            HtmlElement btn = htmlDoc.GetElementById("Login1_LoginButton");
            if (btn != null)
            {
                //设置帐号
                HtmlElement username = htmlDoc.GetElementById("Login1_UserName");

                username.SetAttribute("value", "system");
                //设置密码
                HtmlElement pwd = htmlDoc.GetElementById("Login1_Password");
                pwd.SetAttribute("value", "11111");

                //登录
                if (btn != null)
                {
                    btn.InvokeMember("Click");
                    
                }
                //进入后的网址
                m_WebBrowser.Navigate("http://192.168.0.106:1452/Manager.aspx");
                Thread.Sleep(1000);
                m_Bitmap = new Bitmap(m_WebBrowser.Bounds.Width, m_WebBrowser.Bounds.Height);
                m_WebBrowser.BringToFront();
                HtmlDocument document = m_WebBrowser.Document;
                document.Window.ScrollTo(200, 100);
                m_WebBrowser.DrawToBitmap(m_Bitmap, new Rectangle(new Point(0, 0), new Size(600, 600)));

            }
            else
            {
                m_Bitmap = new Bitmap(m_WebBrowser.Bounds.Width, m_WebBrowser.Bounds.Height);
                m_WebBrowser.BringToFront();
                HtmlDocument document = m_WebBrowser.Document;
                document.Window.ScrollTo(200, 100);
                m_WebBrowser.DrawToBitmap(m_Bitmap, new Rectangle(new Point(0, 0), new Size(600, 600)));

            }
        }

    }