WPF XMAL获取元素的父元素，子元素

/// 获得指定元素的父元素
        /// </summary>
        /// <typeparam name="T">指定页面元素</typeparam>
        /// <param name="obj"></param>
        /// <returns></returns>
        public 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>
        /// 获得指定元素的所有子元素
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="obj"></param>
        /// <returns></returns>
        public List<T> GetChildObjects<T>(DependencyObject obj) where T : FrameworkElement
        {
            DependencyObject child = null;
            List<T> childList = new List<T>();  

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

                if (child is T)
                {
                    childList.Add((T)child);
                }
                childList.AddRange(GetChildObjects<T>(child));
            }
            return childList;
        }

　　

 /// 查找子元素
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="obj"></param>
        /// <param name="name"></param>
        /// <returns></returns>
        public T GetChildObject<T>(DependencyObject obj, string name) 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 && (((T)child).Name == name | string.IsNullOrEmpty(name)))
                {
                    return (T)child;
                }
                else
                {
                    grandChild = GetChildObject<T>(child, name);
                    if (grandChild != null)
                        return grandChild;
                }
            }
            return null;
        }

　　转载自http://blog.csdn.net/duanzi_peng/article/details/17094639