.NET WEB API2 从 JSON 输出中的子 class 检索字段

Question

我正在使用 C# 开发 MVC5 Web API 2 应用程序，我需要帮助格式化 JSON 消息。

目前我的 GET/Appointments 我得到这个 JSON 结果：

[
{
    "Id": 1,
    "FullName": "John Doe",
    "Store": {
        "Id": 4,
        "Name": "Acme Store Inc.",
        "StoreType": {
            "Value": "Big Box Store"
        }
    }
},
{
    ...
}

]

如何更改我的代码以使 JSON 调用看起来像这样？

[
{
    "Id": 1,
    "FullName": "John Doe",
    "Store": {
        "Id": 4,
        "Name": "Acme Store Inc.",
        "Value": "Big Box Store"
    }
},
{
    ...
}

]

这是我的设置：

Models\Appointment.cs

    public class Appointment
    {
        public int Id { get; set; }
        public string FullName{ get; set; }
        public Store Store { get; set; }
        public int StoreId { get; set; }
    }

Models\Store.cs

    public class Store
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public StoreType StoreType { get; set; }
        public int StoreTypeId { get; set; }
    }

Models\StoreType.cs

public class CenterType
    {
        public int Id { get; set; }
        public string Value { get; set; }
    }

Models\MyDBContext.cs

    public class MyDBContext:DbContext
    {
        public DbSet<StoreType> StoreTypes { get; set; }
        public DbSet<Store> Stores { get; set; }
        public DbSet<Appointment> Appointments { get; set; }

        public MyDBContext():base("MyTestDatabase")
        {
        }
    }

App_Start\MappingProfile.cs

    public class MappingProfile:Profile
    {
        public MappingProfile()
        {
            Mapper.CreateMap<Appointment, AppointmentDto>();
            Mapper.CreateMap<Store, StoreDto>();
            Mapper.CreateMap<StoreType, StoreTypeDto>();
        }
    }

Controllers\API\AppointmentsController.cs

    public class AppointmentsController : ApiController
    {
        private MyDBContext _context;

        public AppointmentsController()
        {
            _context = new MyDBContext();
        }

        protected override void Dispose(bool disposing)
        {
            _context.Dispose();
        }

        //  GET /api/appointments
        [HttpGet]
        public IEnumerable<AppointmentDto> GetAppointments()
        {
            return _context.Appointments.Include(x => x.Store).Include(x => x.Store.StoreType).ToList().Select(Mapper.Map<Appointment, AppointmentDto>);
        }

    }

Answer 1

您需要更改 DTO 结构才能完成您想要的。我将给出一个可行的简单示例。

class AppointmentDto {
    public long Id { get; set; }
    public string FullName { get; set; }
    public StoreDto Store { get; set; }
}

class StoreDto {
    public long Id { get; set; }
    public string Name { get; set; }
    public string Value { get; set; }
}

Answer 2

根据 Andrew Kretzer 的建议，您的 DTO 应如下所示

class AppointmentDto {
    public long Id { get; set; }
    public string FullName { get; set; }
    public StoreDto Store { get; set; }
}

class StoreDto {
    public long Id { get; set; }
    public string Name { get; set; }
    public string Value { get; set; }
}

但是要获得预期的行为，您需要将映射更改为：

Mapper.CreateMap<Store, StoreDto>();
Mapper.CreateMap<StoreType, StoreTypeDto>();

到

Mapper.CreateMap<Store, StoreDto>()
   .ForMember(x => x.Value, x => x.MapFrom(store => store.StoreType.Value));

.NET WEB API2 从 JSON 输出中的子 class 检索字段

.NET WEB API2 Retrieve a field from the child class in JSON output

c#

entity-framework

asp.net-web-api2