Question

我有一个简单的宁静服务，看起来像这样。

        [OperationContract]
        [WebInvoke(Method = "DELETE",
            RequestFormat = WebMessageFormat.Json,
            BodyStyle = WebMessageBodyStyle.Bare,
            UriTemplate = "cars/{id}")]
        Car DeleteCar(string id);

    public class CarService : ICarService
    {
        private static List<Car> cList = new List<Car>()
        {
            new Car("VW","Polo",2010,200000,"VWP123"),
            new Car("Volvo","V70",2010,280000,"VOL123"),
            new Car("BMW","Z4",2014,400000,"BMW123")
        }; 

        public Car DeleteCar(string id)
        {
            Car c = GetCar(id);
            if (c == null) return null;
            cList.Remove(c);
            return c;
        }
    }

我尝试使用控制台应用程序来使用它，它有效。它会从列表中删除汽车，但控制台应用程序崩溃。

    carNo = Console.ReadLine().ToUpper();
    Console.WriteLine(DeleteCar(carNo));

    private static Car DeleteCar(string frameNo)
    {
        Car car = DeleteCarAsync(frameNo).Result;
        return car;
    }

    private static async Task<Car> DeleteCarAsync(string frameNo)
    {
        string reqUri = baseUri + frameNo;
        using (HttpClient client = new HttpClient())
        {
            HttpResponseMessage response = await client.DeleteAsync(reqUri);
            if (response.StatusCode == HttpStatusCode.NotFound)
                throw new Exception("Car not found.");

            response.EnsureSuccessStatusCode();


            string str = await response.Content.ReadAsStringAsync();
            Car car = JsonConvert.DeserializeObject<Car>(str);
            return car;

        }
    }

运行代码时，控制台崩溃为＆＃34;未处理的类型＆＃39; System.AggregateException＆＃39;发生在mscorlib.dll＆＃34;在这＆＃34; Car car = DeleteCarAsync（frameNo）.Result;＆＃34; peticaler线。当我重新启动控制台时，打印列表并且我要删除的汽车已经消失。

任何见解都会得到满足。

修改继承你要求的内在例外： Inner Exceptions

根据我从错误中理解的内容，它不会让json字符串返回。

从List中删除时，Restful Service C＃在控制台上出错

0 个答案: