c# - 代码优先 EF : While searching database table is it possible to retrieve list of items it has in DataModel?

Question

我有这个模型

public class Appointment
{

    [Key]
    public Guid Id { get; set; }

    public IEnumerable<Attendee> Attendees { get; set; }

    public DateTime StartDateTime { get; set; }
    public DateTime EndDateTime { get; set; }      
}

和 Attendee 类

public class Attendee
{
    public Guid AttendeeId { get; set; }

    public Guid AppointmentId { get; set; }
    public Appointment Appointment { get; set; }

    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string Email { get; set; }

    public Boolean IsApproved { get; set; }
    public IEnumerable<Response> Responses { get; set; } 
}

和 DbContext 类

public class DatePickerDbContext : IdentityDbContext
{
    public DatePickerDbContext():base("DefaultConnection")
    {
    }
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.Entity<IdentityUser>().ToTable("Users");
        modelBuilder.Entity<ApplicationUser>().ToTable("Users");
        modelBuilder.Entity<IdentityRole>().ToTable("Roles");
    }

    public DbSet<Appointment> Appointments { get; set; }

    public DbSet<Attendee> Attendees { get; set; }
}

现在当我在 Appointments 表上查询时，例如

_db.Appointments.Find(appointmentId);

它不应该延迟加载所有与会者吗？

还是我的模型中遗漏了什么？

附言:

Entity Framework 版本:6.0.2

Asp.Net MVC 版本:5.1.0

Answer 1

要延迟加载相关类，模型中的属性应该是virtual，并且应该是ICollection，而不是IEnumerable:

public virtual ICollection<Attendee> Attendees { get; set; }