视觉树

 　 　　 /// <summary>
        /// 获取指定类型的可视父对象
        /// </summary>
        /// <typeparam name="T">指定类型</typeparam>
        /// <param name="obj">传入的对象</param>
        /// <returns></returns>
        public static T GetParentObject<T>(DependencyObject obj) where T : FrameworkElement
        {
            DependencyObject parent = VisualTreeHelper.GetParent(obj);

            while (parent != null)
            {
                if (parent is T)
                {
                    return (T)parent;
                }
                parent = VisualTreeHelper.GetParent(parent);
            }
            return null;
        }

 　　　　/// <summary>
        /// 获取指定类型的可视子对象
        /// </summary>
        /// <typeparam name="T">指定类型</typeparam>
        /// <param name="obj">传入的对象</param>
        /// <returns></returns>
        public static T GetChildObject<T>(DependencyObject obj) where T : FrameworkElement
        {
            DependencyObject child = null;
            T grandChild = null;

            for (int i = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; i++)
            {
                child = VisualTreeHelper.GetChild(obj, i);

                if (child is T)
                {
                    return (T)child;
                }
                else
                {
                    grandChild = GetChildObject<T>(child);
                    if (grandChild != null)
                        return grandChild;
                }
            }
            return null;
        }