ASP.NET Core+EF Core通讯录：创建联系人时邮箱/手机号未入库

开发基于ASP.NET Core（EF Core）的通讯录Web应用，定义了Contact、Email、Phone三个模型类，三者为一对多关联（每个联系人可拥有多个邮箱和手机号）。但通过Swagger UI创建新联系人时，仅联系人基础信息被保存至数据库，关联的邮箱和手机号未存入；手动输入邮箱和手机号提交后，返回的联系人数据中邮箱和手机号数组仍为空。

已查阅官方文档但帮助有限，尝试过的方案未解决问题，不确定是否是JSON输入导致的关联数据未被正确处理。

ContactController 代码 #

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using incubis_assignment.Data;
using incubis_assignment.Models;
using System.Linq.Expressions;
using System.Diagnostics.Eventing.Reader;

namespace incubis_assignment.Controllers
{
    [Route("api/[controller]")]
    public class ContactController : ControllerBase
    {
        private readonly AppDbContext _context;

        public ContactController(AppDbContext context)
        {
            _context = context;
        }

        [HttpGet]
        public async Task<ActionResult<IEnumerable<Contact>>> GetContacts()
        {
            return await _context.Contacts.ToListAsync();
        }

        [HttpGet("{id}")]
        public async Task<ActionResult<Contact>> GetOneContact(int id)
        {
            var contact = await _context.Contacts.FindAsync(id);

            if (contact == null) 
                return NotFound();

            return contact;
        }

        [HttpPost]
        public async Task<ActionResult<Contact>> PostContact(Contact contact)
        {
            contact.Id = 0;
            _context.Contacts.Add(contact);
            await _context.SaveChangesAsync();

            var resourceUrl = Url.Action(nameof(GetContacts), new { id = contact.Id });
            return Created(resourceUrl, contact);
        }

        [HttpPut("{id}")]
        public async Task<IActionResult> PutContact(int id, [FromBody] Contact contact)
        {
            if (id != contact.Id) 
                return BadRequest();

            _context.Entry(contact).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!ContactExists(id)) 
                    return NotFound();
                else 
                    throw;
            }

            return NoContent();
        }

        [HttpDelete("{id}")]
        public async Task<ActionResult> DeleteContact(int id)
        {
            var contact = await _context.Contacts.FindAsync(id);

            if (contact == null) 
                return NotFound();

            _context.Contacts.Remove(contact);
            await _context.SaveChangesAsync();

            return NoContent();
        }

        private bool ContactExists(int id)
        {
            return _context.Contacts.Any(e => e.Id == id);
        }
    }
}

AppDbContext 代码 #

using Microsoft.EntityFrameworkCore;
using incubis_assignment.Models;
using System.Reflection.Metadata;

namespace incubis_assignment.Data;

public class AppDbContext : DbContext
{
    public AppDbContext(DbContextOptions<AppDbContext> options) : base(options) { }

    public DbSet<Contact> Contacts { get; set; }
    public DbSet<Email> Emails { get; set; }
    public DbSet<Phone> Phones { get; set; }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Contact>()
            .HasMany(c => c.Emails)
            .WithOne(e => e.Contact)
            .HasForeignKey(e => e.ContactId)
            .IsRequired();

        modelBuilder.Entity<Contact>()
            .HasMany(c => c.Phones)
            .WithOne(p => p.Contact)
            .HasForeignKey(p => p.ContactId)
            .IsRequired();
    }
}

Contact 模型类 #

namespace incubis_assignment.Models
{
    public class Contact
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Surname { get; set; }
        public string Address { get; set; }

        public ICollection<Email> Emails { get; set; } = new List<Email>();
        public ICollection<Phone> Phones { get; set; } = new List<Phone>();
    }
}

Email 模型类 #

namespace incubis_assignment.Models
{
    public class Email
    {
        public int Id { get; set; }
        public int ContactId { get; set; }
        public string EmailAddress { get; set; }
        public string Category {  get; set; }

        public Contact Contact { get; set; } // Navigacijsko svojstvo, nema potrebe za null!
    }
}

Phone 模型类 #

namespace incubis_assignment.Models
{
    public class Phone
    {
        public int Id { get; set; }
        public int ContactId { get; set; }
        public string PhoneNumber { get; set; }
        public string Category { get; set; }

        public Contact Contact { get; set; } // Navigacijsko svojstvo, nema potrebe za null!
    }
}

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