微信公众号 生成带参数二维码

    //scene_id 参数
      public string GetewmPic(string scene_id)
        {
            JavaScriptSerializer js = new JavaScriptSerializer();
            //Redis获取token
            RedisHelper rds = new RedisHelper();
            string access_token_key = "access_token_gzh";
            string access_token = rds.ReadStr(access_token_key, 12);
            
            if (string.IsNullOrEmpty(access_token))
            {
                //Redis没有从公众号获取
                string url2 = "https://api.weixin.qq.com/cgi-bin/token";
                string json = StrHelper.GetRequestUrl(url2,"grant_type=client_credential&appid=appid&secret=secret");
                access_token_model lst = JsonConvert.DeserializeObject<access_token_model>(json);
                access_token = lst.access_token;
                rds.InsertStr(access_token_key, access_token, System.DateTime.Now.AddMinutes(5).ToUniversalTime(), 12);
            }
            string tocket = "";
            string poster = "{\"action_name\": \"QR_LIMIT_STR_SCENE\", \"action_info\": {\"scene\": {\"scene_str\": \"" + scene_id + "\"}}}";
            string tockes = StrHelper.PostRequestUrl("https://api.weixin.qq.com/cgi-bin/qrcode/create?access_token=" + access_token, poster);
            action_info wUser = js.Deserialize<action_info>(tockes);
            tocket = Uri.EscapeDataString(wUser.ticket);  //TICKET必需UrlEncode  
            string Picurl = "https://mp.weixin.qq.com/cgi-bin/showqrcode?ticket=" + tocket;
            //将二维码下载到本地
            string allurl = StrHelper.PostMothswxewm(Picurl, "");
            return allurl;
        }
                public static string PostMothswxewm(string url, string param)
        {
            string strURL = url;
            System.Net.HttpWebRequest request;
            request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
            request.Method = "GET";
            string paraUrlCoded = param;
            byte[] payload;
            payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
            request.ContentLength = payload.Length;
            System.Net.HttpWebResponse response;
            response = (System.Net.HttpWebResponse)request.GetResponse();
            System.IO.Stream s;
            s = response.GetResponseStream();//返回图片数据流
            var res = ReadQRCode(s);

            var Bitmap = CreateQRCode(res, 104, 104);
            var stream = new System.IO.MemoryStream();
            Bitmap.Save(stream, ImageFormat.Jpeg);
            stream.Position = 0;

            string date = System.DateTime.Now.ToString("yyyyMMddHHmmssfff");
            string filePath = "xx/sceneimg/" + date + ".jpg";
            webPost.webPost1("xx/sceneimg/", date + ".jpg", stream);
            string allurl = StrHelper.GetPhoto(filePath);
            return allurl;
        }