//处理数据
            var appId = "39864af01f124da898d9f2e9e3bc827b";
            var appSecret = "31e5331bd50a4958b17972ac5a87ab8f";
            var data = "data";
            var hmacsha1 = new HMACSHA1(Encoding.UTF8.GetBytes(appSecret));
            var hashBytes = hmacsha1.ComputeHash(Encoding.UTF8.GetBytes(data));
            var sign = hashBytes.Aggregate("", (current, t) => current + t.ToString("X2"));

            //发请求
            WebClient wc = new WebClient();
            var result = wc.UploadString($"http://demo.visiononline.cn/api/v2/RxOrder/GetNext?appid={appId}&sign=${sign}", "POST", "{\"data\":\"也许是订单号\"}");
            Console.WriteLine(result);