Find the parent control of the specified type in WPF

　　　　　/// <summary>
        /// 查找父控件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="child"></param>
        /// <returns></returns>
        public static T FindVisualParent<T>(DependencyObject child) where T : DependencyObject
        {
            DependencyObject parentObject = VisualTreeHelper.GetParent(child);
            if (parentObject == null) return null;
            T parent = parentObject as T;
            if (parent != null)
            {
                return parent;
            }
            else
            {
                return FindVisualParent<T>(parentObject);
            }
        }