【修改代码】怎样直接获取页面宽和高？？？

using System;

using System.Collections.Generic;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Drawing;

using System.IO;





public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {



    }

    protected void Button1_Click(object sender, EventArgs e)

    {

        Bitmap bmp = HtmlToImg.GetHtmlToImg("http://www.baidu.com", 600, 500, 600, 500);

        MemoryStream stream = new MemoryStream();

        bmp.Save(stream, System.Drawing.Imaging.ImageFormat.Jpeg);

        byte[] buff = stream.ToArray();

        FileStream fs = new FileStream(Server.MapPath(DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg"), FileMode.Create);

        stream.WriteTo(fs);

        stream.Close();

        fs.Close();

    }

}

using System;

using System.Drawing;

using System.Threading;

using System.Windows.Forms;



/// <summary>

/// 生成网页快照

/// </summary>

public class HtmlToImg

{

    Bitmap m_Bitmap;

    string m_Url;

    int m_BrowserWidth, m_BrowserHeight, m_ThumbnailWidth, m_ThumbnailHeight;



    public HtmlToImg(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 GetHtmlToImg(string Url, int BrowserWidth, int BrowserHeight, int ThumbnailWidth, int ThumbnailHeight)

    {

        HtmlToImg thumbnailGenerator = new HtmlToImg(Url, BrowserWidth, BrowserHeight, ThumbnailWidth, ThumbnailHeight);

        return thumbnailGenerator.GenerateHtmlToImgImage();

    }



    public Bitmap GenerateHtmlToImgImage()

    {

        Thread m_thread = new Thread(new ThreadStart(_GenerateHtmlToImgImage));

        m_thread.SetApartmentState(ApartmentState.STA);

        m_thread.Start();

        m_thread.Join();

        return m_Bitmap;

    }



    private void _GenerateHtmlToImgImage()

    {

        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);

    }



}