public static class yanZhengMaHelp    {        //webbrowser验证码        public static Image GetRegCodePic(WebBrowser wbMail, string ImgName, string Src, string Alt)        {            HTMLDocument doc = (HTMLDocument)wbMail.Document.DomDocument;            HTMLBody body = (HTMLBody)doc.body;            IHTMLControlRange rang = (IHTMLControlRange)body.createControlRange();            IHTMLControlElement Img;            if (ImgName == "") //如果没有图片的名字,通过Src或Alt中的关键字来取            {                int ImgNum = GetPicIndex(wbMail, Src, Alt);                if (ImgNum == -1)                {                    return null;                }                Img = (IHTMLControlElement)wbMail.Document.Images[ImgNum].DomElement;            }            else                Img = (IHTMLControlElement)wbMail.Document.All[ImgName].DomElement;            rang.add(Img);            rang.execCommand("Copy", false, null);            Image RegImg = Clipboard.GetImage();            Clipboard.Clear();            return RegImg;        }        public static int GetPicIndex(WebBrowser wbMail, string Src, string Alt)        {            int imgnum = -1;            for (int i = 0; i < wbMail.Document.Images.Count; i++)　//获取所有的Image元素            {                IHTMLImgElement img = (IHTMLImgElement)wbMail.Document.Images[i].DomElement;                if (Alt == "")                {                    if (img.src.Contains(Src)) return i;                }                else                {                    if (!string.IsNullOrEmpty(img.alt))                    {                        if (img.alt.Contains(Alt)) return i;                    }                }            }            return imgnum;        }        //axwebbroswer 验证码  提取        public static Image GetRegCodePic(AxWebBrowser axwbMail, string ImgName, string Src, string Alt)        {                       HTMLDocument doc = (HTMLDocument)axwbMail.Document;            HTMLBody body = (HTMLBody)doc.body;            IHTMLControlRange rang = (IHTMLControlRange)body.createControlRange();            IHTMLControlElement Img;            if (ImgName == "") //如果没有图片的名字,通过Src或Alt中的关键字来取            {                Img = (IHTMLControlElement)GetPicIndex(axwbMail, Src, Alt);                if (Img == null)                {                    return null;                }            }            else            {                Img = (IHTMLControlElement)doc.getElementsByName(ImgName).item(null, 0);            }            rang.add(Img);            rang.execCommand("Copy", false, null);            Image RegImg = Clipboard.GetImage();            Clipboard.Clear();            return RegImg;        }        public static IHTMLImgElement GetPicIndex(AxWebBrowser axwbMail, string Src, string Alt)        {            HTMLDocument doc = (HTMLDocument)axwbMail.Document;            foreach (IHTMLImgElement img in (IHTMLElementCollection)doc.getElementsByTagName("img"))　//获取所有的Image元素            {                if (Alt == "")                {                    if (img.src.Contains(Src)) return img;                }                else                {                    if (!string.IsNullOrEmpty(img.alt))                    {                        if (img.alt.Contains(Alt)) return img;                    }                }            }            return null;        }