WPF silverlight获取子控件（获取DataTemplate里的子控件）

public static class VisualTreeExtensions
    {
        /// <summary>
        /// 获取父节点控件
        /// </summary>
        /// <typeparam name="T">子控件UI</typeparam>
        /// <param name="obj">子控件</param>
        /// <param name="name">父容器名称</param>
        /// <returns>父容器对象</returns>
        public static T GetParent<T>(this DependencyObject obj, string name = null) where T : FrameworkElement
        {
            DependencyObject parent = VisualTreeHelper.GetParent(obj);

            while (parent != null)
            {
                if (parent is T && (((T)parent).Name == name || string.IsNullOrEmpty(name)))
                {
                    return (T)parent;
                }
                parent = VisualTreeHelper.GetParent(parent);
            }

            return null;
        }
        /// <summary>
        /// 获取子控件
        /// </summary>
        /// <typeparam name="T">UI类型</typeparam>
        /// <param name="obj">父容器对象</param>
        /// <param name="name">子控件名称</param>
        /// <returns>子控件</returns>
        public static T GetChild<T>(this DependencyObject obj, string name = null) where T : FrameworkElement
        {
            DependencyObject child = null;
            T grandChild = null;

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

                if (child is T && (((T)child).Name == name | string.IsNullOrEmpty(name)))
                {
                    return (T)child;
                }
                else
                {
                    grandChild = GetChild<T>(child, name);
                    if (grandChild != null)
                        return grandChild;
                }
            }
            return null;
        }
        /// <summary>
        /// 获取子控件集合
        /// </summary>
        /// <typeparam name="T">UI类型</typeparam>
        /// <param name="obj">父容器对象</param>
        /// <param name="name">子控件名称</param>
        /// <returns>子控件集合</returns>
        public static List<T> GetChildren<T>(this DependencyObject obj, string name = null) where T : FrameworkElement
        {
            DependencyObject child = null;
            List<T> childList = new List<T>();

            for (int i = ; i <= VisualTreeHelper.GetChildrenCount(obj) - ; i++)
            {
                child = VisualTreeHelper.GetChild(obj, i);
                if (child is T && (((T)child).Name == name || string.IsNullOrEmpty(name)))
                {
                    childList.Add((T)child);
                }
                childList.AddRange(GetChildren<T>(child, ""));
            }
            return childList;
        }

        /// <summary>
        /// 查找某控件下的所有給定類型的子控件集合
        /// </summary>
        /// <typeparam name="T">要查找的子控件類型</typeparam>
        /// <param name="depObj">父控件</param>
        /// <returns>子控件集合</returns>
        public static T FindVisualChild<T>(this DependencyObject depObj, string childName = null) where T : FrameworkElement
        {
            if (depObj != null)
            {
                for (int i = ; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
                {
                    DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
                    if (child != null && child is T &&
                        (((T)child).Name == childName || string.IsNullOrEmpty(childName)))
                    {
                        return (T)child;
                    }
                    else
                    {
                        T childOfChild = FindVisualChild<T>(child, childName);
                        if (childOfChild != null && childOfChild is T)
                        {
                            return childOfChild;
                        }
                    }
                }
                return null;
            }
            return null;
        }

        /// <summary>
        /// 查找某控件下的所有給定類型的子控件集合
        /// </summary>
        /// <typeparam name="T">要查找的子控件類型</typeparam>
        /// <param name="depObj">父控件</param>
        /// <returns>子控件集合</returns>
        public static List<T> FindVisualChildren<T>(this DependencyObject depObj, string childName = null) where T : FrameworkElement
        {
            List<T> list = new List<T>();
            if (depObj != null)
            {
                for (int i = ; i < VisualTreeHelper.GetChildrenCount(depObj); i++)
                {
                    DependencyObject child = VisualTreeHelper.GetChild(depObj, i);
                    if (child != null && child is T
                        && (((T)child).Name == childName || string.IsNullOrEmpty(childName)))
                    {
                        list.Add((T)child);
                    }

                    List<T> childItems = FindVisualChildren<T>(child, childName);
                    if (childItems != null && childItems.Count > )
                    {
                        foreach (var item in childItems)
                        {
                            list.Add(item);
                        }
                    }
                }
            }
            return list;
        }
    }