WPF MVVM 大量对象属性变更界面没有更新

　　　　　/// <summary>
        /// Simulate Application.DoEvents function of <see cref=" System.Windows.Forms.Application"/> class.
        /// </summary>
        [SecurityPermissionAttribute(SecurityAction.Demand, Flags = SecurityPermissionFlag.UnmanagedCode)]
        public static void DoEvents()
        {
            var frame = new DispatcherFrame();
            Dispatcher.CurrentDispatcher.BeginInvoke(DispatcherPriority.Background,
                new DispatcherOperationCallback(ExitFrames), frame);

            try
            {
                Dispatcher.PushFrame(frame);
            }
            catch(Exception ex)
            {

            }
            //catch (InvalidOperationException ex)
            //{
            //}
        }

        private static object ExitFrames(object frame)
        {
            ((DispatcherFrame)frame).Continue = false;
            return null;
        }