ASP.NET Core Web API接收含关联属性的ContactEntity时JSON转换报错求助

我是ASP.NET Core新手，正在开发基于Entity Framework Core 6的WPF应用，调用ASP.NET Core 6 Web API时遇到问题。我尝试创建带有CreateContact方法的ContactController，但调用接口时返回400错误。

实体类代码 #

ContactEntity #

public class ContactEntity : _EntityBase
{
    private string _FirstName;

    public string FirstName
    {
        get { return _FirstName; }
        set
        {
            if (_FirstName != value)
            {
                _FirstName = value;
                RaisePropertyChanged("FirstName");
            }
        }
    }

    public List<ContactEmailEntity> ContactEmails { get; set; }

    public ContactEntity()
    {
        ContactEmails = new List<ContactEmailEntity>();
    }
}

ContactEmailEntity #

注意：该类包含指向ContactEntity的引用属性

[Table("ContactEmails")]
public class ContactEmailEntity : _EntityBase
{
    private string _EmailAddress = "";

    public string EmailAddress
    {
        get { return _EmailAddress; }
        set
        {
            if (_EmailAddress != value) 
            {
                _EmailAddress = value;
                RaisePropertyChanged("EmailAddress");
            }
        }
    }

    [ForeignKey("ContactId")]
    public int? ContactId { get; set; }
    public ContactEntity? Contact { get; set; }
}

控制器代码 #

[Route("api/[controller]/[action]")]
[ApiController]
public class ContactController : ControllerBase
{
    [HttpPost]
    public IActionResult CreateContact([FromBody] ContactEntity myContact)
    {
        // Do some stuff
        return Ok(true);
    }
}

错误信息 #

调用接口后返回400错误，详情如下：

{
  "type": "https://tools.ietf.org/html/rfc7231#section-6.5.1",
  "title": "One or more validation errors occurred.",
  "status": 400,
  "traceId": "00-b8c375d4c3f10c5097b982cac5b01c64-be98749a0187e8fb-00",
  "errors": {
    "myContact": [
      "The myContact field is required."
    ],
    "$.contactEmails[0].contact": [
      "The JSON value could not be converted to Entities.ContactEntity. Path: $.contactEmails[0].contact | LineNumber: 8 | BytePositionInLine: 25."
    ]
  }
}

当前尝试与疑问 #

• 我发现如果移除ContactEmailEntity中的Contact属性，接口就能正常运行并访问控制器
• 看到有建议使用DTO（如下示例），但这意味着我需要维护两个属性相似的类：一个实现INotifyPropertyChanged用于WPF UI绑定，另一个作为POCO用于API数据传输，还要做数据映射，感觉比较繁琐

public class CreateContactInput
{
    [Required]  // Specify the data annotation attribute for property validation
    public string FirstName { get; set; }
    public string MiddleName { get; set; }
    public string LastName { get; set; }
    public string CompanyName { get; set; }
    public string Title { get; set; }
    public string Suffix { get; set; }
    public string DisplayName { get; set; }
    public string Tags { get; set; }
    public string Notes { get; set; }
    public string EmailAddress { get; set; }
}

我想知道：直接移除ContactEmailEntity中的Contact属性是否会带来其他问题？有没有更简便的替代方案？

内容的提问来源于stack exchange，提问作者CoderForHire