using System;
using System.Data;
using System.Windows.Forms;
using System.Drawing;

/// <summary>
/// WebSnap ：网页抓图对象
/// </summary>
public class WebSnap2
{


    public WebSnap2()
    {
        //
        // TODO: 在此处添加构造函数逻辑 //
    }

    /// <summary>
    /// 开始一个抓图并返回图象
    /// </summary>
    /// <param name="Url">要抓取的网页地址</param>
    /// <returns></returns>
    public Bitmap StartSnap(string Url)
    {
        WebBrowser myWB = this.GetPage(Url);
        Bitmap returnValue = this.SnapWeb(myWB);
        myWB.Dispose();
        return returnValue;
    }

    private WebBrowser GetPage(string Url)
    {
        WebBrowser myWB = new WebBrowser();
        myWB.ScrollBarsEnabled = false;
        myWB.Navigate(Url);
        while (myWB.ReadyState != WebBrowserReadyState.Complete)
        {
            System.Windows.Forms.Application.DoEvents();
        }
        return myWB;
    }

    private Bitmap SnapWeb(WebBrowser wb)
    {
        HtmlDocument hd = wb.Document;
        int height = Convert.ToInt32(hd.Body.GetAttribute("scrollHeight")) + 10;
        int width = Convert.ToInt32(hd.Body.GetAttribute("scrollWidth")) + 10;
        wb.Height = height;
        wb.Width = width;
        Bitmap bmp = new Bitmap(width, height);
        Rectangle rec = new Rectangle();
        rec.Width = width;
        rec.Height = height;
        wb.DrawToBitmap(bmp, rec);
        return bmp;
    }

}

public class Browser
    {
        private string url;
        private int w;
        private int h;

        private WebBrowser browser;

        public string Url
        {
            get { return url; }
            set { url = value; }
        }

        public Browser(string url)
        {
            this.url = url;

            Screen screen = Screen.AllScreens[0];
            this.w = screen.Bounds.Width;
            this.h = 1200; //screen.Bounds.Height;
            this.nav();
        }

        public void nav()
        {
            this.browser = new WebBrowser();
            this.browser.Size = new Size(this.w,this.h);
            this.browser.ScrollBarsEnabled = false;
        }

        public void navIt()
        {
            this.browser.Navigate(this.url);
            while (this.browser.ReadyState!= WebBrowserReadyState.Complete)
            {
                Application.DoEvents();
            }
        }

        public void getWebBitmap()
        {
            Bitmap bmp=new Bitmap(this.w,this.h);
            this.browser.DrawToBitmap(bmp,this.browser.ClientRectangle);
            bmp.Save(Application.StartupPath + @"\crl.jpg");
            bmp.Dispose();
        }

    }

<script src="javascript:'document.body.innerHTML+=\'\'';"></script>