Silverlight获取子控件和父控件方法

public class VTHelper
    {
         // 在实际项目中，为满足实际开发需求，对VisualTreeHelper的方法重新进行封装是非常必要的。
        ///首先要介绍的Hleper方法是GetParentObject方法，获取父控件方法。该方法将根据当前控件，遍历查找其父控件是否存在。参数1是表示当前子控件名，参数2是要查询父控件名；使用VisualTreeHelper.GetParent方法获取当前父控件。

        public T GetParentObject<T>(DependencyObject obj,string name) 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;
        }

        //另外一个Helper方法是GetChildobject,获取子控件方法。该方法将根据当前控件，遍历查找其子控件是否存在。参数1是表示当前父控件名，参数2是要查询子控件名；

        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;

        }

        /// <summary>
        /// 找出符合条件的一个子对象.
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="obj"></param>
        /// <returns></returns>
        public T GetChildobjectByType<T>(DependencyObject obj) 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 )
                {
                    return (T)child;
                }
                else
                {
                    grandChild = GetChildobjectByType<T>(child);
                    if (grandChild != null)
                        return grandChild;
                }
            }

            return null;

        }

        //最后介绍一个Helper方法是GetChildobjects方法，该方法将把所有子控件作为List集合返回到客户端。其中第一个参数是父控件参数，而第二个参数是特定子控件名称，如果需要遍历全部子控件，第二个参数留空即可。

        public List<T> GetChildobjects<T>(DependencyObject obj,string name) 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,""));
            }

            return childList;

        }

    }

 

转载自 http://www.voidcn.com/article/p-zyvpucrm-bke.html