实体框架DbContext删除子对象

我试图删除foreach循环中的子对象，但这似乎不工作。这是我有的。我有一个meeting和一个meeting_category实体，它们有一对多的关系。

    foreach (meeting_category meetingCategory in currentMeeting.meeting_category)
            {
              dbContext.meeting_category.Remove(meetingCategory);
              dbContext.Entry(meetingCategory).State = EntityState.Deleted;
              dbContext.SaveChanges();
            }

我然后返回到相同的视图与更新的结果。这似乎很不一致。有时它删除实体，有时不删除。即使它删除了它，我的会议对象仍然有我删除的meeting_category对象。

当它不从DB中删除时，它更新会议对象并从会议中删除meeting_category对象。是否有任何类型的重置或刷新，我将不得不做，以便会议对象删除meeting_category对象。我怎样才能确保它始终如一地从数据库和会议对象中删除meeting_category对象，当我返回到视图时，我有一个更新的会议对象?

这是我的会议实体

    public partial class meeting
    {
        public meeting()
        {
            this.meeting_questions = new HashSet<meeting_questions>();
            this.meeting_abstract = new HashSet<meeting_abstract>();
            this.meeting_category = new HashSet<meeting_category>();
            this.meeting_image = new HashSet<meeting_image>();
        }
        public int meeting_id { get; set; }
        public int language_id { get; set; }
        public string meeting_code { get; set; }
        public string meeting_name { get; set; }
        public string meeting_description { get; set; }
        public System.DateTime meeting_start_date { get; set; }
        public System.DateTime meeting_end_date { get; set; }
        public System.DateTime abstract_cutoff_date { get; set; }
        public string meeting_guidelines { get; set; }
        public string created_by { get; set; }
        public Nullable<System.DateTime> created_datetime { get; set; }
        public Nullable<bool> meeting_published { get; set; }
        public Nullable<bool> meeting_deleted { get; set; }
        public Nullable<bool> meeting_fully_created { get; set; }
        public virtual language language { get; set; }
        public virtual ICollection<meeting_questions> meeting_questions { get; set; }
        public virtual ICollection<meeting_abstract> meeting_abstract { get; set; }
        public virtual ICollection<meeting_category> meeting_category { get; set; }
        public virtual ICollection<meeting_image> meeting_image { get; set; }
    }

这里是我的meeting_category实体

 public partial class meeting_category
    {
        public meeting_category()
        {
            this.abstract_category = new HashSet<abstract_category>();
        }
        public int meeting_category_id { get; set; }
        public int meeting_id { get; set; }
        public int category_type_id { get; set; }
        public int category_id { get; set; }
        public string category_name { get; set; }
        public string category_name_en { get; set; }
        public virtual ICollection<abstract_category> abstract_category { get; set; }
        public virtual category category { get; set; }
        public virtual category_type category_type { get; set; }
        public virtual meeting meeting { get; set; }
    }