原文:

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。

/// 
        /// 获取图片路径        /// 
        ///         /// 
             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;        }        /// 
        /// 获取img标签        /// 
        ///         /// 
             public string[] GetHtmlImageUrlList(string sHtmlText)        {            Regex regImg = new Regex(@"
     
      <>]*?\bsrc[\s\t\r\n]*=[\s\t\r\n]*[""']?[\s\t\r\n]*(?
      
       [^\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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