[System.Web.Http.HttpPost]
        public HttpResponseMessage GetProduct([FromBody] dynamic json)
        {
            var product = new { success = true, errorMsg = "", data = "" };
            string jsons = Convert.ToString(json);
            var products = Post(jsons);//调用接口方法
            ResultMsg res = JsonConvert.DeserializeObject<ResultMsg>(products);
            bool succ =Convert.ToBoolean( res.success.ToString());
            string mes = res.errorMsg.ToString();
            string dataa = res.data.ToString();
            if (succ==true)
            {
                 product = new { success = true, errorMsg = mes,data=dataa};
            }
            else
            {
                 product = new { success = false, errorMsg = mes, data = dataa };
            }
            HttpResponseMessage result = new HttpResponseMessage();
            result.Content = new StringContent(JsonConvert.SerializeObject(product), Encoding.GetEncoding("UTF-8"), "application/json");
            return result;
        }

大概逻辑是调用这个方法，在此方法中在调用真正的接口方法，将返回值给设定一下格式基本就可以了。最基本的方法。