WPF MVVM数据列表UI未刷新问题

1.VM后台数据列表：

        private ObservableCollection<TreeViewModel> _TreeFamilyData = new ObservableCollection<TreeViewModel>();
        /// <summary>
        /// 显示数据
        /// </summary>
        public ObservableCollection<TreeViewModel> TreeFamilyData
        {
            get { return _TreeFamilyData; }
            set { _TreeFamilyData = value; }
        }

2.数据源变化然后调用System.ComponentModel.ICollectionView集合刷新：

            System.ComponentModel.ICollectionView view = System.Windows.Data.CollectionViewSource.GetDefaultView(TreeFamilyData);
            view.Refresh();