从JsonConvert反序列化JSON对象返回null

Question

不串行化从API响应获取数据

var apiResponseDetails = authorityApiResponse.Content.ReadAsStringAsync().Result;
"[
{
"<RoleName>k__BackingField":"L5 _Admin _Role",
"<RoleType>k__BackingField":"565,1"
}
]"

当反序列化RoleName和RoleType的相同响应为null时

lstRole = Newtonsoft.Json.JsonConvert.DeserializeObject<List<ChangeRoleNotification>>(Convert.ToString(apiResponseDetails));
Name                Value                               
lstRole             Count = 1                           
[0]             {Presentation.Common.ChangeRoleNotification}    
RoleName     null                                            
RoleType     null

---

[Serializable]
public class ChangeRoleNotification
{
[Newtonsoft.Json.JsonProperty(PropertyName = "RoleName")]
public string RoleName { get; set; }
[Newtonsoft.Json.JsonProperty(PropertyName = "RoleType")]
public string RoleType { get; set; }
}
...
GetUserRolesDetailsRequest getUserRolesDetails = new GetUserRolesDetailsRequest();
getUserRolesDetails.UserID = objUser.UserId;
getUserRolesDetails.RoleName = HttpContext.Current.Session["UserTypeName"].ToString();
getUserRolesDetails.RoleType = HttpContext.Current.Session["RoleType"].ToString();
getUserRolesDetails.RoleID = Convert.ToInt64(HttpContext.Current.Session["RoleID"]);

System.Net.Http.HttpResponseMessage authorityApiResponse = new System.Net.Http.HttpResponseMessage(false ? HttpStatusCode.OK : HttpStatusCode.BadRequest);
System.Net.Http.HttpContent RequestDetails = new StringContent(Newtonsoft.Json.JsonConvert.SerializeObject(getUserRolesDetails), Encoding.UTF8);
if (!String.IsNullOrEmpty(GetWebConfigKeyValueStatic("FrameworkApiURL")))
{
authorityApiResponse = API.PostAPIAsJson($"{GetWebConfigKeyValueStatic("FrameworkApiURL")}Category/GetCategoryUserRolesDetails", RequestDetails);
if (authorityApiResponse != null && authorityApiResponse.StatusCode == HttpStatusCode.OK && authorityApiResponse.Content.ReadAsStringAsync().Result != null)
{
var apiResponseDetails = authorityApiResponse.Content.ReadAsStringAsync().Result;
lstRole = new List<ChangeRoleNotification>();
lstRole = Newtonsoft.Json.JsonConvert.DeserializeObject<List<ChangeRoleNotification>>(Convert.ToString(apiResponseDetails));
}
}

由于我正在将一个项目转换为ASP.NET MVC 3-Tier，我看到了一个奇怪的k__BackingField，这意味着什么？

---

更新为响应API的服务器端代码段：

[Route("Category/GetCategoryUserRolesDetails")]
[ActionName("GetCategoryUserRolesDetails")]
[HttpPost]
public HttpResponseMessage GetCategoryUserRolesDetails(CategoryRequestDetails categoryRequestDetails)
{
List<ChangeRoleNotification> response = null;
FrameworkAPIs.Log.LogClass.log.Debug("nModule Name : Category;nMethod Name : GetCategoryUserRolesDetails;n Message :GetCategoryUserRolesDetails method starts ");
string statusCode = String.Empty;
DateTime StartTime = DateTime.Now;
DateTime EndTime = DateTime.Now;
Int64 WebServiceLogID = (new ServiceLogGenerator()).GenerateLog(categoryRequestDetails, "Category", "GetCategoryUserRolesDetails", StartTime, EndTime, "", "", null, 0);
try
{
ManageCategory mangageCategory = new ManageCategory();
if (categoryRequestDetails.UserID > 0)
response = mangageCategory.GetCategoryUserRolesDetails(categoryRequestDetails);
else
return Request.CreateErrorResponse(HttpStatusCode.BadRequest, "Invalid UserID");
}
catch (Exception ex)
{
FrameworkAPIs.Log.LogClass.log.Error("nModule Name : Category;nMethod Name : GetCategoryUserRolesDetails;nError Message : " + ex.Message + ex.StackTrace + "n");
(new ServiceLogGenerator()).GenerateLog(null, "", "", StartTime, DateTime.Now, ex.StackTrace + ";n" + ex.Message, "", null, WebServiceLogID);
return Request.CreateErrorResponse(HttpStatusCode.InternalServerError, ex);
}
(new ServiceLogGenerator()).GenerateLog(null, "", "", StartTime, DateTime.Now, "", "", response, WebServiceLogID);
FrameworkAPIs.Log.LogClass.log.Debug("nModule Name : Category;nMethod Name : GetCategoryUserRolesDetails;n Message :GetCategoryUserRolesDetails method endsnResult :" + response);
return Request.CreateResponse<List<ChangeRoleNotification>>(HttpStatusCode.OK, response);
}

Answer 1

我认为这不是一个合适的解决方案，因为添加了[JsonObject]属性而不是[Serializable]。解决了k__BackingField和null的问题。如果有人知道如何通过添加[Serializable]来处理这一问题，他们总是受到的欢迎

[Newtonsoft.Json.JsonObject]
public class ChangeRoleNotification
{
public string RoleName { get; set; }
public string RoleType { get; set; }
}

---

更新了以下方法

方法一：k__BackingField消失。但null似乎在服务器端中持续存在

[Serializable]
public class ChangeRoleNotification
{
private string RoleNameField;
public string RoleName
{
get { return RoleNameField; }
set { RoleNameField = value; }
}
private string RoleTypeField;
public string RoleType
{
get { return RoleTypeField; }
set { RoleTypeField = value; }
}
}

方法II(已成功(：k__BackingField和null均消失

[Serializable, DataContract]
public class ChangeRoleNotification
{
[DataMember]
public string RoleName { get; set; }
[DataMember]
public string RoleType { get; set; }
}

通过在类中添加[DataContract]，仅在服务器端添加属性的[DataMember]，我认为这是最合适的