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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