清除提要按钮激活：控制器需要删除提要列表。
Clean feeds button activation: the controller needs to erase the feed list.
为了把 Web 服务的 list 方法简化一些，可以把控制器中的 list 方法变成像清单 3 一样，清除分页。
To simplify the list method a little for the Web service, remove the pagination by making the list method in the controller look like Listing 3.
Ntdsutil绑定到的域控制器不能是要通过清除元数据来删除的域控制器。
Ntdsutil has to bind to a domain controller other than the one that will be removed with metadata cleanup.
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