C#获取微信二维码显示到wpf

微信的api开放的二维码是一个链接地址，而我们要将这个二维码显示到客户端。方式很多，今天我们讲其中一种。

 /// <summary>
        /// 获取图片路径
        /// </summary>
        /// <param name="httpurl"></param>
        /// <returns></returns>
        public string getimageurl(string httpurl)
        {
            httpwebrequest req = (httpwebrequest)webrequest.create(httpurl);
            req.servicepoint.expect100continue = false;
            req.method = "get";
            req.keepalive = true;
            req.contenttype = "image/png";
            httpwebresponse rsp = (httpwebresponse)req.getresponse();
            streamreader reader = new streamreader(rsp.getresponsestream(), encoding.getencoding("utf-8"));
            string str = reader.readtoend();
            string[] imgstr = gethtmlimageurllist(str);
            string strer = "https://open.weixin.qq.com" + imgstr[0];
            return strer;
        }
        /// <summary>
        /// 获取img标签
        /// </summary>
        /// <param name="shtmltext"></param>
        /// <returns></returns>
        public string[] gethtmlimageurllist(string shtmltext)
        {
            regex regimg = new regex(@"<img\b[^<>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""']?[\s\t\r\n]*(?<imgurl>[^\s\t\r\n""'<>]*)[^<>]*?/?[\s\t\r\n]*>", regexoptions.ignorecase);
            matchcollection matches = regimg.matches(shtmltext);
            int i = 0;
            string[] surllist = new string[matches.count];
            foreach (match match in matches)
                surllist[i++] = match.groups["imgurl"].value;
            return surllist;
        }

调用方式：

string imgurl= getimageurl("https://open.weixin.qq.com/......微信地址");
            img.source = new bitmapimage(new uri(imgurl));

这个是访问微信地址url，获取到这个url中显示的微信二维码，拿到这个图片，显示到wpf

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