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