EF，.Net CORE 2.0中的多对多列表查询

Question

我希望能够将n个用户与特定成就相关联。

public class VPTSDbContext : DbContext
{
    public DbSet<Accomplishment> Accomplishments { get; set; }
    public DbSet<User> Users { get; set; }

    public VPTSDbContext(DbContextOptions options) : base(options) {}

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<UserAccomplishment>().HasKey(ua => new { ua.AccomplishmentID, ua.UserID });
        modelBuilder.Entity<UserAccomplishment>().HasOne(ua => ua.Accomplishment).WithMany(u => u.UserAccomplishments).HasForeignKey(ua => ua.AccomplishmentID);
        modelBuilder.Entity<UserAccomplishment>().HasOne(ua => ua.User).WithMany(u => u.UserAccomplishments).HasForeignKey(ua => ua.UserID);
    }

}

User.cs

public class User
{
    [Required]
    public string Name { get; set; }

    [Key]
    public int UserID { get; set; }

    public virtual ICollection<UserAccomplishment> UserAccomplishments { get; set; }
}

Accomplishment.cs

    public class Accomplishment
{
    [Key]
    public int AccomplishmentID { get; set; }

    [Required]
    public string Title { get; set; }

    public virtual ICollection<UserAccomplishment> UserAccomplishments { get; set; }
}

这是我的链接表：     公共类UserAccomplishment     {

    [Required]
    public int AccomplishmentID { get; set; }
    public virtual Accomplishment Accomplishment { get; set; }

    [Required]
    public int UserID { get; set; }
    public virtual User User { get; set; }

}

如何取回所有成就，包括用户模型？

我尝试了以下内容：

public List<Accomplishment> GetAll()
{
    return dbContext.Accomplishments.Include(ua => ua.UserAccomplishments).ToList();
}

这将返回用户（在本例中为2,3和9），但我也需要用户的信息。

[{"accomplishmentID":1,"title":"Test Accomplishment","userAccomplishments":[{"accomplishmentID":1,"userID":2,"user":null},{"accomplishmentID":2,"userID":3,"user":null},{"accomplishmentID":2,"userID":9,"user":null}]}]

如何获取用户的信息？

仅供参考，用户在ThenInclude中不可用：