Ru.GameSchool.DataLayer.Repository.UserInfo.FixupCourses C# (CSharp) Метод

        private void FixupCourses(object sender, NotifyCollectionChangedEventArgs e)
        {
            if (e.NewItems != null)
            {
                foreach (Course item in e.NewItems)
                {
                    if (!item.UserInfoes.Contains(this))
                    {
                        item.UserInfoes.Add(this);
                    }
                }
            }
    
            if (e.OldItems != null)
            {
                foreach (Course item in e.OldItems)
                {
                    if (item.UserInfoes.Contains(this))
                    {
                        item.UserInfoes.Remove(this);
                    }
                }
            }
        }