WPF中查找子控件、父控件的方法

        /// <summary>        /// 查找指定类型的子控件        /// </summary>        /// <typeparam name="childItem">子控件类型</typeparam>        /// <param name="obj">父控件</param>        /// <returns></returns>        public static childItem FindVisualChild<childItem>(DependencyObject obj) where childItem : DependencyObject        {            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)            {                DependencyObject child = VisualTreeHelper.GetChild(obj, i);                if (child != null && child is childItem)                    return (childItem)child;                else                {                    childItem childOfChild = FindVisualChild<childItem>(child);                    if (childOfChild != null)                        return childOfChild;                }            }            return null;        }        /// <summary>        /// 查找某种类型的子控件，并返回一个List集合        /// </summary>        /// <example>List<Button> listButtons = GetChildObjects<Button>(parentPanel, typeof(Button))</example>        /// <typeparam name="T">子控件类型</typeparam>        /// <param name="obj">父控件</param>        /// <param name="type">子控件的类</param>        /// <returns></returns>        public static List<T> GetChildObjects<T>(DependencyObject obj, Type type) where T : DependencyObject        {            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).GetType() == type))                {                    childList.Add((T)child);                }                childList.AddRange(GetChildObjects<T>(child, type));            }            return childList;        }        /// <summary>        /// 通过名称查找子控件，并返回一个List集合        /// </summary>        /// <example>List<Button> listButtons = GetChildObjects<Button>(parentPanel, "button1")</example>        /// <typeparam name="T">子控件类型</typeparam>        /// <param name="obj">父控件</param>        /// <param name="name">子控件名称，默认为空</param>        /// <returns></returns>        public static List<T> GetChildObjects<T>(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(GetChildObjects<T>(child, name));            }            return childList;        }        /// <summary>        /// 通过名称查找某类型的子控件        /// </summary>        /// <example>StackPanel sp = GetChildObject<StackPanel>(this.LayoutRoot, "spDemoPanel")</example>        /// <typeparam name="T">子控件类型</typeparam>        /// <param name="obj">父控件</param>        /// <param name="name">子控件名称，默认为空</param>        /// <returns></returns>        public static T GetChildObject<T>(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 = GetChildObject<T>(child, name);                    if (grandChild != null)                        return grandChild;                }            }            return null;        }        /// <summary>        /// 通过名称查找父控件        /// </summary>        /// <example>Grid layoutGrid = VTHelper.GetParentObject<Grid>(this.spDemoPanel, "LayoutRoot")</example>        /// <typeparam name="T">父控件类型</typeparam>        /// <param name="obj">子控件</param>        /// <param name="name">父控件名称，默认为空</param>        /// <returns></returns>        public static T GetParentObject<T>(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;        }