YOS K

寫習慣ASP.NET與Window Form遇到有子階層控制項的物件都很反射性的下FindControl

但是之前寫Window Phone 7有用到ListBox卻發現沒這個方法，而要用VisualTreeHelper去取得樹狀結構在進行一些處理

而我這個人又很懶...重複的code不想寫太多次...所以就寫了這個擴充方法

namespace Yos.Dev.Ext
{
    public static class ListBoxExtension
    {
        public static T FindControl(this ListBox listBox, int rowIndex, string childName) where T : FrameworkElement
        {
            DependencyObject listItem = listBox.ItemContainerGenerator.ContainerFromIndex(rowIndex);
            return listItem.FindControl(childName); 
        }

        public static T FindControl(this DependencyObject item, string childName) where T : FrameworkElement
        {
            int count = VisualTreeHelper.GetChildrenCount(item);
            for (int index = 0; index < count; index++)
            {
                DependencyObject citem = VisualTreeHelper.GetChild(item, index);
                if (citem is T && ((T)citem).Name == childName)
                    return ((T)citem);


                T t = citem.FindControl(childName);
                if (t != null && t.Name == childName)
                    return t;
            }

            return null;
        }
    }
}