webbrowser-C#-两种方法取得验证码

//先添加对 mshtml 的引用， 在 COM 页上， 选择 Microsoft HTML Object Library
//使用命名空间  using mshtml;
//登录url  有id http://passport.csdn.net/UserLogin.aspx
//登录url   没有id  http://www.himporter.com/index.php?c=Members


方法一   有id

 HTMLDocument html = (HTMLDocument)this.webBrowser1.Document.DomDocument;
            IHTMLControlElement img = (IHTMLControlElement)webBrowser1.Document.Images["MzImgExpPwd"].DomElement;

            IHTMLControlRange range = (IHTMLControlRange)((HTMLBody)html.body).createControlRange();
            range.add(img);
            range.execCommand("Copy", false, null);

            img = null;
            range = null;
            html = null;

            if
            (Clipboard.ContainsImage())
            {
                this.pictureBox1.Image = Clipboard.GetImage();
            }
            else
            {
                MessageBox.Show("执行不成功");
            }

            Clipboard.Clear();

方法二 没有id

  HtmlElementCollection hc = webBrowser1.Document.GetElementsByTagName("img");
            HtmlElement h0 = null;
            foreach (HtmlElement h in hc)
            {
                if (h.OuterHtml.Contains("imgcode.html"))
                {
                    h0 = h;
                    //MessageBox.Show(h.OuterHtml.ToString());
                }

            }
          
            //MessageBox.Show( h0.GetAttribute("src"));
            string  imgurl=h0.GetAttribute("src");
            pictureBox1.ImageLocation = imgurl;