小编Mic*_*cky的帖子

我有一个像这样的模特

public class User
{
    [Key]
    public long UserId { get; set; }

    [Required]
    public String Nickname { get; set; }

    public virtual ICollection<Group> Memberships { get; set; }
}

public class Group
{
    [Key]
    public long GroupId { get; set; }

    [Required]
    public String Name { get; set; }

    public virtual ICollection<User> Members { get; set; }
}

public class DataContext : DbContext
{
    public DbSet<User> Users { get; set; }
    public DbSet<Group> Groups { get; set; }

    public …