JsonConvert.DeserializeObject 读取对象引用“1”时出错

Question

我正在尝试从 angular 发布的对象反序列化 Web Api 中的对象。我收到一个错误：读取对象引用“1”时出错。路径'Developers[0].DeveloperId'，第 20 行，位置 21 我的 Json 对象是（已被验证为有效 JSON）：

{
  "Id": 0,
  "Name": "Name",
  "OwnerId": 1,
  "Description": "Description",
  "Note": "My Notes",
  "Stakeholders": [
    {
      "$id": "1",
      "StakeholderId": 1,
      "Name": "Mary",
      "DateModified": "2018-02-21T12:28:15.023",
      "DateCreated": "2018-02-21T12:28:15.023",
      "$$hashKey": "object:3"
    }
  ],
  "Developers": [
    {
      "$id": "1",
      "DeveloperId": 1,
      "DeveloperName": "Joseph",
      "DateModified": "2018-02-21T12:28:26.07",
      "DateCreated": "2018-02-21T12:28:26.07",
      "$$hashKey": "object:4"
    }
  ]
}

我正在尝试反序列化：

var app = JsonConvert.DeserializeObject<Application>(request.ToString(), new JsonSerializerSettings
            {
                NullValueHandling = NullValueHandling.Ignore
            });

开发者类（类似于Stakeholder类）

public class Developer : IModificationHistory
{
    public int DeveloperId { get; set; }
    [Required]
    public string DeveloperName { get; set; }
    [JsonIgnore]
    public virtual List<Application> Applications { get; set; }
    public DateTime DateModified { get; set; }
    public DateTime DateCreated { get; set; }
}

应用程序类很简单：

public class Application
{

    public int Id { get; set; }
    [Required]
    public string Name { get; set; }
    [Required]
    public string Description { get; set; }
    public string Note { get; set; }

    public virtual List<Stakeholder> Stakeholders { get; set; }
    public int OwnerId { get; set; }
    public virtual List<Developer> Developers { get; set; }

}

我用来调用这篇文章的javascript是：

    var data =
    {
        Id: vm.appId,
        Name: vm.applicationName,
        OwnerId: vm.owner.DeveloperId,
        Description: vm.applicationDescription,
        Note: vm.note,
        Stakeholders: vm.selectedStakeholders,
        Developers: vm.selectedDevelopers

};


    $http.post("/api/Application/Post/", JSON.stringify(data))

利益相关者列表已正确填写，但开发人员列表未填写。如果我将开发人员放在利益相关者之前的列表中，那么开发人员列表会被正确填写，而利益相关者则不会。任何建议将不胜感激！

Answer 1

问题在于$id的值相同，都设置为1，见内部异常：

{"一个不同的值已经有 Id '1'。"}

我刚刚将它的值更改为 2，它工作正常：

{
  "Id": 0,
  "Name": "Name",
  "OwnerId": 1,
  "Description": "Description",
  "Note": "My Notes",
  "Stakeholders": [
    {
      "$id": "1",
      "StakeholderId": 1,
      "Name": "Mary",
      "DateModified": "2018-02-21T12:28:15.023",
      "DateCreated": "2018-02-21T12:28:15.023",
      "$$hashKey": "object:3"
    }
  ],
  "Developers": [
    {
      "$id": "2",
      "DeveloperId": 1,
      "DeveloperName": "Joseph",
      "DateModified": "2018-02-21T12:28:26.07",
      "DateCreated": "2018-02-21T12:28:26.07",
      "$$hashKey": "object:4"
    }
  ]
}

这是我的输出截图：