wpf 遍历listview 时 传入指定类型 得到指定类型控件info

private ChildType FindVisualChild<ChildType>(DependencyObject obj) where ChildType : DependencyObject
        {
            for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
            {
                DependencyObject child = VisualTreeHelper.GetChild(obj,i);
                if (child!=null&& child is ChildType)
                {
                    return child as ChildType;
                }
                else
                {
                    ChildType childOfChildren = FindVisualChild<ChildType>(child);
                    if (childOfChildren!=null)
                    {
                        return childOfChildren;
                    }
                }
            }
            return null;

        }