none
silverlight遍历子元素 Get Descendant ,Childern RRS feed

  • 常规讨论

  • 项目中遇到需要获取一个元素的所有子元素或后代元素, 系统有FindName("Name"),但我们需要的元素大部分都没有name,而且FindName只能返回一个结果。我们扩展了  方法,解决的获取所有子元素或后代元素

           public static List<DependencyObject> GetChildern(this DependencyObject root)
            {
                if (root == null)
                    return null;
                int count = VisualTreeHelper.GetChildrenCount(root);
                if (count <= 0)
                    return null;
                List<DependencyObject> child = new List<DependencyObject>();
                for (int i = 0; i < count; i++)
                {
                    DependencyObject c = VisualTreeHelper.GetChild(root, i);
                    if (c != null)
                        child.Add(c);
                }
                return child;
            }

            public static List<DependencyObject> GetDescendants(this DependencyObject root)
            {
                if (root == null)
                    return null;
                List<DependencyObject> temp = root.GetChildern();
                if (temp == null || temp.Count == 0)
                    return null;
                List<DependencyObject> ds = new List<DependencyObject>();          
                ds.AddRange(temp);
                foreach (var t in temp)
                {
                    List<DependencyObject> list = t.GetDescendants();
                    if (list != null && list.Count > 0)
                        ds.AddRange(list);
                }
                return ds;          
            }

    2011年6月18日 8:24