实时调节Grid的高度

问题描述：如题

 

解决方法：

            if (_isBatch == false )
            {
                _isBatch = true;
                ListHeignt.Height = new GridLength(120, GridUnitType.Pixel);
                btnBatch.Content = "取消批量操作";
            }
            else
            {
                _isBatch = false ;
                ListHeignt.Height = new GridLength(0, GridUnitType.Pixel);
                btnBatch.Content = "批量操作";
            }