我有一个简单的联系应用程序，使用SQLLITE作为数据库。我首先使用EF代码来设计它的数据库。当我保存数据时，它的ID如期在数据库中产生(Auto Increment)，但SaveChanges方法总是为ID返回1。
我如何才能获得最新的表ID？
DbContext：

public class ApplicationDbContext : DbContext
{
    protected override void OnConfiguring(DbContextOptionsBuilder options)
    {
        string dbPath = DbPathGenerator.GetDbPath();
        options.UseSqlite($"Data Source={dbPath}/LiteContactsDb.db");
    }
    public DbSet<Person> Persons { get; set; }
    public DbSet<Address> Addresses { get; set; }
    public DbSet<Phone> Phones { get; set; }
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Person>()
            .HasMany<Address>()
            .WithOne(a => a.Person)
            .HasForeignKey(a => a.PersonId);
        modelBuilder.Entity<Person>()
            .HasMany<Phone>()
            .WithOne(a => a.Person)
            .HasForeignKey(a => a.PersonId);
        base.OnModelCreating(modelBuilder);
    }
}

保存方法：

public bool SaveContact(PersonViewModel personViewModel, PhoneViewModel phoneViewModel, AddressViewModel addressViewModel)
    {
        bool result = false;
        try
        {
            Person person = new Person();
            person.FirstName = personViewModel.FirstName;
            person.LastName = personViewModel.LastName;
            person.Email = personViewModel.Email;
            _context.Persons.Add(person);
            var personId = _context.SaveChanges();
            Phone phone = new Phone();
            phone.PersonId = personId;
            phone.PhoneTitle = phoneViewModel.PhoneTitle;
            phone.PhoneNumber = phoneViewModel.PhoneNumber;
            Address address = new Address();
            address.PersonId = personId;
            address.AddressTitle = addressViewModel.AddressTitle;
            address.AddressString = addressViewModel.AddressString;
            address.PostalCode = addressViewModel.PostalCode;
            _context.Phones.Add(phone);
            _context.Addresses.Add(address);
            _context.SaveChanges();
            result = true;
        }
        catch (Exception ex)
        {
            result = false;
        }
        return result;
    }

**_context.SaveChanges()；**始终返回1。

谢谢