c# 后台获取小程序码 返回base64 或者 直接在本地保存图片_c# 获取小程序码

ps:生成小程序码用到的APIKEY 和SECRETKEY  必须是发布过后的小程序

1.获取Accesstoken

        /// <summary>
        /// 返回Accesstoken
        /// </summary>
        /// <param name="InputObj">Date</param>
        /// <returns></returns>
        public string GetAccesstoken()
        {

           try
            {

                String APIKEY = "你的apikey";//小程序id
                String SECRETKEY = "你的secret";//小程序密钥
                String requestUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + APIKEY + "&secret=" + SECRETKEY;

                StringBuilder sb = new StringBuilder();//获取拼接读取到的json字符
                string content;
                System.Net.WebClient client = new WebClient();
                content = client.DownloadString(requestUrl);
                //解析
                JObject json = (JObject)JsonConvert.DeserializeObject(content);
                string jsondata = json["access_token"].ToString();//access_token

                return jsondata;
            }
            catch (Except