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。

1/// <summary>
2        /// 获取图片路径
3        /// </summary>
4        /// <param name="httpUrl"></param>
5        /// <returns></returns>
6        public string GetImageUrl(string httpUrl)
7        {
8            HttpWebRequest req = (HttpWebRequest)WebRequest.Create(httpUrl);
9            req.ServicePoint.Expect100Continue = false;
10            req.Method = "GET";
11            req.KeepAlive = true;
12            req.ContentType = "image/png";
13            HttpWebResponse rsp = (HttpWebResponse)req.GetResponse();
14            StreamReader reader = new StreamReader(rsp.GetResponseStream(), Encoding.GetEncoding("utf-8"));
15            string str = reader.ReadToEnd();
16            string[] imgStr = GetHtmlImageUrlList(str);
17            string strer = "https://open.weixin.qq.com" + imgStr[0];
18            return strer;
19        }
20        /// <summary>
21        /// 获取img标签
22        /// </summary>
23        /// <param name="sHtmlText"></param>
24        /// <returns></returns>
25        public string[] GetHtmlImageUrlList(string sHtmlText)
26        {
27            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);
28            MatchCollection matches = regImg.Matches(sHtmlText);
29            int i = 0;
30            string[] sUrlList = new string[matches.Count];
31            foreach (Match match in matches)
32                sUrlList[i++] = match.Groups["imgUrl"].Value;
33            return sUrlList;
34        }

调用方式：

1string imgUrl= GetImageUrl("https://open.weixin.qq.com/......微信地址");
2            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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