private static void OnItemsSourceChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
CardList control = (CardList)o;
IEnumerable value = (IEnumerable)e.NewValue;
//先用现有数据更新一次表头，当表头数据加载完成后，用新的表头数据再次更新表头
if (value != null)
{
control.UpdateItems();
if (value is INotifyCollectionChanged)
{
((INotifyCollectionChanged)value).CollectionChanged += (o1, e1) =>
{
control.UpdateItems();
};
}
}
}
private static void OnItemTemplateChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
CardList control = (CardList)o;
control.UpdateItems();
}