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 = 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 = 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 = 0; i <= VisualTreeHelper.GetChildrenCount(obj) - 1; 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 = 0; 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 = 0; 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 > 0)

                    {

                        foreach (var item in childItems)

                        {

                            list.Add(item);

                        }

                    }

                }

            }

            return list;

        }

    }