C# JObject.ToObject与模型状态之间存在错误

在ASP.NET核心项目中，我已从使用

ResourceModel

切换到使用

JObject

作为我的

[FromBody]

参数。然后，我将

JObject.ToObject（）

传递到一个服务中，但希望为

ContainsKey

和类似功能维护

JObject

本身

如果

JObject.ToObject

成功，我可以使用

TryValidateModel（）

如果失败，返回

BadRequest（ModelState）

。但是，我遇到的问题是当

JObject.ToObject

抛出异常时-我不确定如何捕获

ModelState

中的序列化错误

例如：

public class Person {
    public string FirstName {get;set;}
    public string LastName {get;set;}
    public uint Age {get;set;}
}
public class CommonParameters {
    [FromQuery] public string? Fields {get;set;}
    public string UserName {get;set;}
    public IPAddress? RequestorIp {get;set;}
    public JObject? JsonBody {get;set;}
}
public class PersonController : ControllerBase {
    private readonly PersonService _personService;
    // this is how I had been doing it
    [HttpPatch("obsolete/{id}")] // this method doesn't actually exist, but is shown for the example
    public async Task<IActionResult> UpdatePerson([FromRoute] int id, [FromBody] Person parameters, [FromHeader] CommonParameters commonParameters) {
         SetCommonParameters(commonParameters, parameters);
         // if parameters.Age in the json body was a string, BadRequest is returned before this method even starts
         _personService.Set(parameters);
         await _personService.SaveChangesAsync();
         return NoContent();
    }
    // this is how I'm trying to do it now, so that I only update Age if JObject.ContainsKey("Age")
    // instead of parameters.Age != default, etc.
    [HttpPatch("{id}")]
    public async Task<IActionResult> UpdatePerson([FromRoute] int Id, [FromBody] JObject parameters, [FromHeader] CommonParameters commonParameters) {
         SetCommonParameters(commonParameters, parameters);
         // if parameters.Age is a string in this version, a JsonReaderException 
         // or JsonSerializationException is thrown when I call JObject.ToObject<>()
         // and I have to validate the model separately after that
         // what this means is, a BadRequest with the ModelState errors is not
         // returned if there's an issue with the json.
         var model = parameters.ToObject<Person>();
         if (!TryValidateModel(model)) return BadRequest(ModelState);
         _personService.Set(person);
         await _personService.SaveChangesAsync();
         return NoContent();
    }
    private void SetCommonParameters(CommonParameters commonParameters, JObject? jsonBody = null) {
        commonParameters.JsonBody = jsonBody;
        commonParameters.UserName = User.Identity?.Name;
        commonParameters.RequestorIp = Request.HttpContext.Connection.RemoteIpAddress;
    }
}

在这种情况下，将上述用于

ContactInfo

的json传递给请求

ContactInfo

参数的控制器方法将返回一个错误的请求，指示状态无效、地址号码无效和电话号码无效-无需专门测试，如下所示

{
  "errors": {
    "phoneNumbers": [
      "Could not parse phone number \"1-800-CALL-NOW\". The value must be an 11-digit numeric value."
    ],
    "addressNumber": [
      "The value could not be parsed as int."
    ],
    "state": [
      "\"Atlantic\" is an invalid value for State. The following values are valid: ..."
    ]
  }
}

---

相反，如果控制器请求

JObject

，然后我调用

JObject.ToObject

并捕获异常，我将得到其中一个错误，例如

无法解析电话号码“1-800-call-NOW”。该值必须是11位数字。

其他值将被忽略，直到该值被修复且用户重试。

您可以捕获异常并使用

ModelState.AddModelError（“，…”）将其文本添加为模型级错误

不幸的是，这将只捕获一个异常（第一个解析错误），而不是可能发生的所有异常。请提供一些无效json和预期错误输出的示例。@GuruStron我已更新文章，在底部包含一个示例。您的意思是要获取ModelState的所有错误吗？如果是，您可以使用

foreach（ModelState中的var项）

来foreach ModelState的错误。

{
  "phoneNumbers": {
    "work": [ "1-111-111-1111" ],
    "home": [ "2-222-222-2222" ],
    "cell": [ "1-800-CALL-NOW" ]
  },
  "apartment": null,
  "addressNumber": "3a",
  "streetName": "Imagination St.",
  "city": "Atlantis",
  "state": "Atlantic"
}

{
  "errors": {
    "phoneNumbers": [
      "Could not parse phone number \"1-800-CALL-NOW\". The value must be an 11-digit numeric value."
    ],
    "addressNumber": [
      "The value could not be parsed as int."
    ],
    "state": [
      "\"Atlantic\" is an invalid value for State. The following values are valid: ..."
    ]
  }
}