解决c#利用WebBrowser截取验证码图片无法获取的问题

 1 /// <summary>
 2         /// 返回指定WebBrowser中图片<IMG></IMG>中的图内容
 3         /// </summary>
 4         /// <param name="WebCtl">WebBrowser控件</param>
 5         /// <param name="ImgeTag">IMG元素</param>
 6         /// <returns>IMG对象</returns>
 7         private Image GetWebImage(WebBrowser WebCtl, HtmlElement ImgeTag)
 8         {
 9             HTMLDocument doc = (HTMLDocument)WebCtl.Document.DomDocument;
10             HTMLBody body = (HTMLBody)doc.body;
11             IHTMLControlRange rang = (IHTMLControlRange)body.createControlRange();
12             IHTMLControlElement Img = (IHTMLControlElement)ImgeTag.DomElement; //图片地址
13  
14             Image oldImage = Clipboard.GetImage();
15             rang.add(Img);
16             rang.execCommand("Copy", false, null);  //拷贝到内存
17             Image numImage = Clipboard.GetImage();
18             try
19             {
20                 Clipboard.SetImage(oldImage);
21             }
22             catch
23             {
24             }
25  
26             return numImage;
27         }