public async Task <Result <CarInfo> > GetCarInfoAsync(string carTagId) { FormUrlEncodedContent content = new FormUrlEncodedContentBuilder() .Add("CarTagId", carTagId) .Build(); HttpClient client = NetUtils.Instance(); HttpResponseMessage respone = await client.PostAsync(NetURL.URL_CAR_INFO, content); ResponseResult result = NetUtils.ExplainHttpResponce(respone); CarInfo carInfo = null; if (result.StateCode == 200) { carInfo = CarInfo.InstanceFormJson(result.Data); } return(Result <CarInfo> .FromResponseResult(result, carInfo)); }