HTTP|POST提交数据：ContentType=application/json 内容格式|C#源码

 //对象模型
            ApiModel api = new ApiModel
            {
                appid = "qifan",
                nonce = new Random().Next(1000, 9999).ToString(),
                timestamp = GetTimeStamp(),
                data = json,
                sign = signStr,
                operation = "add",
            };

            //转为JSON
            var postData = Newtonsoft.Json.JsonConvert.SerializeObject(api);

            //提交数据
            var result = WebApiTools.Post(url, postData, "application/json;charset=UTF-8;");
            return Newtonsoft.Json.JsonConvert.DeserializeObject<PostResult>(result);