.Net 6 API 不返回嵌套列表对象

Question

我们正在将 API 从 .net 4.8 库移至 .Net 6。我遇到了一个奇怪的问题，即没有任何嵌套对象（成本）被序列化。

我尝试在启动中添加 using，但我的 api 无法使用此选项。我什至看不到启用此选项的控制器。

Newtonsoft.Json.Serialization;
...............

    services.AddControllers().AddNewtonsoftJson();
  

或者

`services.AddControllers().AddNewtonsoftJson(options =>`
`{`
`options.SerializerSettings.ContractResolver = new DefaultContractResolver();`
`options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;`
`});`

        


services.AddControllers().AddJsonOptions(o =>
{
    o.JsonSerializerOptions.MaxDepth = 4;
    o.JsonSerializerOptions.PropertyNamingPolicy = null;
    o.JsonSerializerOptions.DictionaryKeyPolicy = null;
});

我缺少什么？

我期望以下格式

   `{
       "Status": 200,
       "Message": "Processed Successfully",
       "Description": null,
       "Errors": null,
       "ResponseObject": {
       "Costs": [
        {
            "Component": "xxx",
            "Key1": "123",
            "Key2": null,
            "Key3": null,
            "ProductCode": "x",
            "From": "2021-08-05T00:00:00",
            "To": "2021-08-05T23:59:59",
            "Value": "1584",
            "CurrencyCode": null,
            "UnitOfMeasure": null
        },
        {
            "Component": "X",
            "Key1": "123",
            "Key2": null,
            "Key3": null,
            "ProductCode": "Y",
            "From": "2021-08-05T00:00:00",
            "To": "2021-08-05T23:59:59",
            "Value": "3131",
            "CurrencyCode": null,
            "UnitOfMeasure": null
        }
        ]
    }`

C#对象如下：

public class Response 
{
    public int Status { get; set; }
    public string Message { get; set; }
    public string Description { get; set; }
    public object Errors { get; set; }
    public object ResponseObject { get; set; }
}

下面是用于填充对象的代码：

var costsVM = new CostsVM();

var response = new Response();
costsVM.Costs.AddRange(costs);
response.ResponseObject = costsVM;
response.Status = 200;
response.Message = "Processed Successfully";
response.Description = null;
return Ok(response);

成本VM定义如下：

  public class CostsVM
    {
        public List<CostsDTO> Costs = new List<CostsDTO>();
    }

public class CostsDTO
{
    public string Component { get; set; }
    public string? Key1 { get; set; }
    public string? Key2 { get; set; }
    public string? Key3 { get; set; }
    public string ProductCode { get; set; }
    public DateTime From { get; set; }
    public DateTime To { get; set; }
    public string Value { get; set; }
    public string? CurrencyCode { get; set; }
    public string? UnitOfMeasure { get; set; }
}

Answer 1

我似乎找到了解决办法。

我需要在 JsonSerializer 中启用 IncludeFields

services.AddMvc().AddJsonOptions(options =>
{
     options.JsonSerializerOptions.PropertyNamingPolicy = null;
     options.JsonSerializerOptions.MaxDepth = 64;
     options.JsonSerializerOptions.IncludeFields = true;
 });