Csharp ASP.NET 反序列化 JSON 返回 Null

我是ASP.NET新手，我正在try 向Yesno API发出GET请求.

但是，当try 反序列化JSON响应并将值赋给变量时，我得到的值为空值.

如有任何帮助，我们将不胜感激！

控制器代码:

    [RoutePrefix("api/YesNo")]
    public class YesNoController : ApiController
    {

        [Route("GetYesNo")]
        public HttpResponseMessage GetYesNo()
        {
            Uri loginUrl = new Uri("https://yesno.wtf/api");
            HttpClient client = new HttpClient();
            client.BaseAddress = loginUrl;

            YesNoModel YesNoData = new YesNoModel();
            var httpResponse = Request.CreateResponse(HttpStatusCode.OK);

            HttpResponseMessage response = client.GetAsync(client.BaseAddress).Result;
            if (response.IsSuccessStatusCode)
            {
                string data = response.Content.ReadAsStringAsync().Result;
                YesNoData = JsonConvert.DeserializeObject<YesNoModel>(data);
            }

            httpResponse.Content = new StringContent(JsonConvert.SerializeObject(YesNoData), Encoding.UTF8, "application/json");
            return httpResponse;
        }
    }
    class YesNoModel
    { 
        string answer { get; set; }
        bool forced { get; set; }
        string image { get; set; }
    }

postman 回复示例:

{
    "answer": "no",
    "forced": false,
    "image": "https://yesno.wtf/assets/no/20-56c4b19517aa69c8f7081939198341a4.gif"
}

调试过程中数据变量的值: data var value个

调试过程中YesNoData变量的值: YesNoData var value个